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Journal Clubs in 2025
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Date: Thursday 27 March 2025
| Time: 17:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title:Atmospheric turbulence monitoring using a robust non-tracking Differential Image Motion Monitor (DIMM)
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Presenter, Affiliation: Jaya Chand, ex-ING
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Abstract:The Differential Image Motion Monitor (DIMM) is widely used to monitor astronomical optical turbulence which is characterised by the Fried parameter (râ‚€). Astronomical DIMM systems require a bright reference star meaning a telescope mount with accurate pointing and tracking is required. In order to track stars, costly mounts are needed. Locations at higher latitudes in the northern hemisphere allow the use of Polaris as the reference star. The proximity of this star to the zenith when viewed from these locations opens up the possibility of deploying a non-tracking DIMM.
However, the lack of an equivalent star in the Southern Hemisphere limits the applicability of such setups. Thus, we present a fixed, non-tracking DIMM capable of measuring the Fried parameter using target stars transiting across its large field of view from any location.
We tested the setup through simulations and compared this to on-sky data to determine the limits of usable star magnitudes and to investigate the effects exposure times and centroiding methods have on râ‚€ measurements obtained. The instrument was compared with a Polaris-pointing DIMM and observational data was collected in Durham, UK, and La Palma, Canary Islands, to provide varied data.
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Date: Wednesday 19 February 2025
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title:Special Journal Club Edition - A chat with Andrea!
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Presenter, Affiliation: Andrea Henderson de la Fuente, NOT
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Abstract:Let's return to the roots of the words "Journal Club" and change up our usual recipe to a more interactive session. We are going to listen to a 10 minute presentation by Andrea discussing two different papers. After that, it will be followed by a Q&A and discussion session where ideas can be bounced around, open questions can be made, or any other things can come up.
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Date: Monday 20 January 2025
| Time: 16:30 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title:S-PLUS MUSE - STARLIGHT & Revelations on Star Formation History of NGC1436
(Alternative Title: The Data Gymnastics I do because I don’t have WEAVE data)
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Presenter, Affiliation: Saskia Schlagenhauf, ING
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Abstract:Galaxies falling into a cluster provide an excellent laboratory for studying the effects of environmental changes on galaxy evolution. While falling into the cluster, a galaxy can be subject to tidal interactions with the large-scale cluster potential, direct gravitational interactions with other cluster members or ram-pressure stripping of their diffuse gas. Tracing back the star formation history (SFH) is an important piece for reconstructing the consequences from interactions with the cluster. We determine the SFH by combining observation data from both the integral field spectrograph MUSE and the multi-band photometric survey S-PLUS. This combination of datasets allows us to overcome MUSE's limited wavelength range by extending the observed wavelengths to blue bands, which is especially important for analysing young stellar populations. The simultaneous fit of spectroscopic and photometric data is performed with the spectral synthesis code STARLIGHT, which creates a synthetic spectra by combining a set of synthetic stellar population models with different ages and metallicities that match the observed spectrum. In this talk, I present first results for the galaxy NGC 1436, a galaxy that recently fell into the Fornax cluster.
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Journal Clubs in 2024
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Date: Monday 16 December 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title:Circumnavigation in Time Project
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Presenter, Affiliation: Maciej Zapiór & Artem Koval, Astronomical Institute of the Czech Academy of Sciences
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Abstract: "Circumnavigation in Time" is an international project combining science, art, and the history of navigation. The main goal is to record the trajectory of the Sun around the world, which refers to the traditional methods of orientation in time and space used by sailors and travelers. By sending solarigraphic cameras to different time zones, we create synchronized "time sculptures". The project explores the relationship between the movement of the Sun and our global perception of space and time, promoting international cooperation and interplay between science, art, and navigation.
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Date: Monday 9 December 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title:How a living couple in stellar condition can be the astrophysical equivalent of pristine archeological fossils
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Presenter, Affiliation: Jeppe Thomsen, ex-NOT
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Abstract:I'm going to show you all one of many examples of how the FIES spectrograph at the NOT can be used for groundbreaking science without having to do exoplanets. Our victim is a wobbly red giant that will eclipse all your expectations, as well as its tiny partner. They might not look it, but they're almost as old as our own Galaxy, and that is precisely why they're interesting. So strap yourselves in, we're going on an expedition with living fossils
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Date: Wednesday 20 November 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title:Lightning in a bottle
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Presenter, Affiliation: Benjamin Hauptmann, NOT
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Abstract: Despite being known and feared for all of human history, the phenomenon of lightning is not well understood. In particular, the mechanism of cloud electrification eludes us.
The few measurements taken of thunderstorm E-fields have thus far been very limited in scope. In this presentation, I detail the development, construction and testing of a new, drone-based system to further these measurements. By gliding on columns of laminar updraft, our fixed-wing aircraft should be able to probe the deadliest regions of a thunderstorm, completely autonomously. This work culminated in a high-altitude test flight which almost ended successfully.
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Date: Friday 8 November 2024
| Time: 15:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: An asteroseismic analysis of the δSct stars of the open cluster Pleiades |
Presenter, Affiliation: Astrid Theil, NOT
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Abstract: During this presentation we are going to ask ourselves the four following questions:
- What is asteroseismology?
- What are delta Scuti stars?
- How are delta Scuti stars similar to solar-like stars?
- And how does one analyze delta Scuti stars?
Asteroseismology has for many years been a way of finding the mass and radius of stars, giving precise estimates from the oscillations in stars.
These oscillations however have to be solar-like, so how do stars with other oscillations behave, and how can they be characterized.
This talk will be a deep dive into the wonderful universe of delta Scuti stars and their chaotic oscillation patterns.
We will fly to the Pleiades and have a closer look at the intermediate mass stars of this open cluster.
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Date: Wednesday 16 October 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Not so unremarkable after all: A search for late-time interaction between Type Ia supernovae and circumstellar material |
Presenter, Affiliation: Jacco Terwel, NOT
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Abstract:Type Ia supernovae (SNe Ia) are the most commonly observed explosive transient event in the universe, and is the result of a white dwarf starting a runaway process of nuclear fusion that fully disrupts the star. Due to the relation between their maximum brightness, decline rate, and colour, it's possible to standardise them and measure the distance to these SNe and their host galaxies. However, despite this and their use in cosmology, the processes that precede these explosions are still poorly understood. One way to gain information about the progenitor systems is by looking at SNe Ia-CSM the rare class of that interacts with circumstellar material (CSM) that was ejected from the progenitor system before the explosion.
In this talk I will present my search for SNe Ia interacting with CSM at late times. As this requires analysing many SNe with light curves spanning years in order to find that needle in the haystack, this can only be done using large samples, dedicated surveys, and a custom pipeline. I will present my search through three samples that, together, total over 15,000 objects. While I recovered many interesting objects, only a handful of these are what I am actually looking for. This shows the rarity of this class of objects, and the importance of systematically searching through large data sets for such events in order to gain new insights in the chain of events that leads to a SN Ia.
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Date: Friday 30 August 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title:The Isaac Newton Telescope: Its journey in space and time |
Presenter, Affiliation: Cecilia Fariña, ING
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Abstract:
The Isaac Newton Telescope (INT) was the first telescope installed at the ORM, beginning operations here in 1984, though its story began much earlier at a different location. Its journey will continue at the ORM into the future as it is reborn as a robotic telescope with an amazing scientific project.
In this talk, we will explore the rich history of the INT, from its early beginnings to its significant contributions to astronomy and the exciting future that lies ahead.
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Date: Friday 19 July 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title:Galactic Byte: Exploring Galaxies with Machine Learning |
Presenter, Affiliation: Shravya Shenoy, ING
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Abstract:
Machine learning seems to be the new buzzword, and for good reason—its prowess in pattern recognition and data analysis is revolutionizing how we sift through astronomical data. In the first part of this talk, I’ll take you on a whistle-stop tour through the (very) basics of machine learning, complete with enough jargon to make you sound impressive at parties. Next, we'll venture into the universe of radio astronomy, the unsung hero that can see through cosmic dust clouds better than Kryptonians with X-ray vision! We'll uncover how radio data reveal the secrets of star-forming galaxies and supermassive black holes among others. Finally, bringing it all together, I’ll share a bit about my PhD project—an ambitious mix of radio observations, optical spectroscopy, and machine learning techniques to explore star-forming galaxies. Together, these tools help us piece together a part of the puzzle of galaxy evolution.
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Date: Thursday 11 July 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Linear Polarimetry of Asteroid (3200) Phaethon |
Presenter, Affiliation: Mikael Turkki, NOT
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Abstract:
(3200) Phaethon is a fascinating asteroid. This potentially hazardous near-Sun asteroid has shown yet unexplained features in different kinds of optical observations. Phaethon and its linear polarization observations are covered in the talk, which will be given in two parts of ~45 minutes. The first part will offer a brief introduction to linear polarimetry and show the results that were analyzed for my MSc thesis. The second part of the talk will tackle the reasons why the naive inclusion of the results in the literature into the analysis yielded misleading outcome. In particular, the shortcomings in error propagations in earlier literature are discussed by both academic argumentation and a series of simulations.
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Date: Friday 14 June 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: How will the world(s) end? |
Presenter, Affiliation: Boris Gänsicke, University of Warwick
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Abstract:
Less than 30 years ago, we did not know whether planets exist outside our solar system. Fast forward to 2024, astronomers have discovered well over 5000 planets orbiting other stars similar to our Sun, including some that may have the right conditions to host life. As we learned that the formation of planets seems to go hand-in-hand with the birth of stars, we begin to wonder: What happens to planetary systems when their host stars run out of fuel, and turn into Earth-sized white dwarfs? Are those systems, if they exist, detectable? What will happen to our solar system, and to the Earth? And what are the possible implications for life? I will discuss the late evolution of planetary systems, the observational fingerprints of planets and their debris orbiting white dwarfs, and how studying these exotic systems improves our general understanding of the formation of planets.
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Date: Friday 7 June 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title:1) Snow white and the double white dwarf binary star systems. Happy, Sneezy, for the Docs, Bashful and Grumpy
2) Dotting the f's and crossing the t's: Studying some of the final moments of binary evolution through gravitational-wave induced orbital decay. |
Presenter, Affiliation: James Munday, University of Warwick
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Abstract:
I will give a two part talk [(1) and (2)] about white dwarfs with an emphasis on binary star systems. The talk will be observations orientated, relating wherever possible to the roque. First, I will explain white dwarfs and white dwarf binaries by speaking about the current state of the field; what we know, are in the process of solving and the observational techniques to detect compact (< ~1 day) binaries. Then, in the second half, I will speak about what I consider to be the most exciting objects in the Milky Way: ultra-compact double white dwarfs with periods on the timescale of just 5 to 60 minutes, in which the two stars are separated by merely ~0.1 solar radii. Such ultra-compact systems are on the precipice of becoming type 1a supernovae, merging to become exotic star types, or evensurviving inspiral.
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Date: Wednesday 29 May 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title:How to take pictures of crabs🦀: An introduction to novel drift-strip detector modules for gamma-ray detection in the Compton regim |
Presenter, Affiliation: Benjamin Hauptmann, NOT
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Abstract:
People take for granted how simple astrophysics can be in the low energies. When observing in the x-rays, we must make do without focusing optics, and with only a small handful of photons. Our new generation of solid-state detectors, developed in collaboration with Kromek, can help illuminate the most difficult area of the high-energy spectrum, namely the so-called MeV-gap. In the near future, these detectors will be used to study distant supernovae, and help identify breast cancer in patients.
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Date: Friday 24 May 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title:Interstellar chisme – On how the humanity is being ghosted by ET |
Presenter, Affiliation: Ida Janiak, ING
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Abstract:
The question of whether we are alone in the Universe has long fascinated researchers, inspiring decades of theories and speculation. It wasn’t until the 20th century, with the rapid advancement of technology, that we embarked on a scientific journey to search for signs of our cosmic neighbours. Presently, humanity is deeply engrossed in a multifaceted quest to discover extraterrestrial life, employing a diverse array of techniques and facilities worldwide. Our research spans from basic microbial organisms to advanced civilizations with technology far surpassing our own understanding. Despite our extensive efforts, these elusive aliens have somehow managed to evade detection. Are we unique in the cosmos, or are we one of the many civilizations to witness this moment in cosmic history? Join me as I introduce you to the captivating world of searches for extraterrestrial life, where we explore some of the most crucial concepts, ongoing projects, and facilities utilized globally.
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Date: Friday 17 May 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title:Asteroseismology in solar-like stars |
Presenter, Affiliation: Astrid Theil, NOT
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Abstract:
Knowing the mass and radius of a star is very important for researching the Universe. The question is how do we measure these things? We cannot simply send an astronaut with a scale or a measuring tape. And brightness on the nigh sky is not only dependent on how big and massive a star is, it is also dependent on the distance. A highly precise way of measuring the mass and radius for some stars, namely the solar-like, is
asteroseismology. In this talk you can learn how you go from a timeseries to find the mass, radius, surface gravity and density of a star!
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Date: Friday 3 May 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title:Observing Gamma Ray Bursts at very high energies |
Presenter, Affiliation: Irene Burelli, MAGIC Telescopes
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Abstract:
Gamma Ray Bursts (GRBs) are brief bursts of electromagnetic energy that emit an immense amount of gamma-ray energy (ranging from 10^49 to 10^56 erg) within milliseconds to seconds. Until recently, the detection of TeV band emissions from these sources was solely theoretical, lacking observational evidence. However, in 2019, advancements in technology, particularly through Atmospheric Cherenkov Telescopes (IACTs) like MAGIC and H.E.S.S., finally allowed for the confirmation of this predicted component.
The current generation of Cherenkov telescopes (MAGIC, H.E.S.S., VERITAS) has only managed to observe a handful of GRBs emitting very high energies (VHE: E> 100GeV). Moreover, while VHE emission is expected during both the prompt emission and afterglow phases, all recorded observations to date have been associated solely with the afterglow phase.
The observation of VHE emissions from GRBs is crucial for understanding the emission and acceleration mechanisms occurring within the most extreme cosmological environments.
With the forthcoming Cherenkov Telescope Array Observatory, there will be an increase in the number of identified sources, broadening the spectrum of sources utilized in unraveling the mechanisms behind these explosive events.
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Date: Friday 26 April 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title:Galactic kinematics of white dwarfs and the fastest outliers |
Presenter, Affiliation: Roberto Raddi, Universitat Politècnica de Catalunya
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Abstract:
The Gaia mission is leading to unprecedented discoveries in Galactic astronomy, delivering a detailed chemo-dynamic picture of the Milky Way, thanks to the
availability of 6D kinematics. Moreover, Gaia has been very successful at classifying specific classes of stars and, in particular, it has favoured the discovery and characterization of the rarest of them.
This talk will be organized in two parts. First, I will describe how we can use the kinematics of white dwarfs to probe the past history and evolution of our own Galaxy.
In the second part, I will focus on a few new chemically peculiar stars, whose larger space velocities are making them escape from the Galactic potential. Such stars are suggested to have survived thermonuclear supernovae that follow the explosion of white dwarfs in binary systems.
Both kinematically average white dwarfs and peculiar objects will be targeted by future large area surveys, enhancing our understanding of the complexity of the Milky Way.
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Date: Friday 8 March 2024
| Time: 16:30 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title:Charting Cosmic Collisions: Gravitational Waves and their Electromagnetic Counterparts |
Presenter, Affiliation: Benjamin Godson, ING
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Abstract:
The advent of gravitational wave (GW) multi-messenger astronomy, brought about by the first electromagnetic (EM) counterpart to a binary neutron star (BNS) merger, has proven transformative for our understanding of the Universe. The combination of GW and EM information of this first event, the kilonova associated with GW170817, was uniquely able to deliver transformative science such as spectroscopic identification of r-process nucleosynthesis, joint constraints on the neutron star equation of state, a standard siren measurement of the Hubble Constant, and confirmation of the progenitors of short-duration gamma ray bursts.
Promptly identifying and locating these electromagnetic counterparts remains a difficult task. This talk will introduce the Gravitational-wave Optical Transient Observer (GOTO), a network of robotic telescopes (with one node here on La Palma!) designed to bridge the gap between gravitational wave detectors and conventional optical telescopes.
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Date: Friday 23 February 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Atmospheric turbulence monitoring using a robust non-tracking Differential Image Motion Monitor (DIMM)
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Presenter, Affiliation: Jaya Chand, ING
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Abstract:
The Differential Image Motion Monitor (DIMM) is the standard instrument used for evaluating the seeing conditions at astronomical observing sites. Previous work has investigated motorising the DIMM to optimise for target selection, but the robotic setup presents a limiting factor and is not always desirable, for example, to support numerous remote optical ground station operation. With this in mind, an untracked, fixed-pointing DIMM has been developed with a user-friendly interface in mind. This aims to enable a network of low-cost robust instruments without needing protective domes to support applications such as astronomical observations or laser communications. The methodology is simulated and developed using Python and then tested with real data taken from observations in Durham, United Kingdom and La Palma, Canary Islands.
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Date: Friday 26 January 2024
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Variety of high amplitude flares from the centers of galaxies
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Presenter, Affiliation: Nada Ihanec, ING
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Abstract:
In recent years, time-domain astronomy has become an important branch of observational astronomy, with the discoveries of new types of events, challenging our view on the Universe. In particular, large scale long-term photometric surveys (such as Gaia, OGLE, ZTF, ATLAS, ASAS-SN...) reported many high amplitude optical/UV flares from the centers of both quiescent and active galaxies. In the later ones, luminosity of the flares has far exceeded what has been known about optical photometric variability of active galaxies. A variety of the mechanisms have been proposed to explain such events, from Tidal Disruption Events, Bowen Fluorescence Flares, Changing Look Quasars or Microlensing Events... However most of them still remain a mystery up to date and only continuous search and monitoring of the events will help us shed a light into mechanism driving the flares. The goal of observing and studying this events is to understand what drives the mechanisms behind those flares and deriving the properties of the Supermassive Black Holes in the centers of the host galaxies as well as the properties of the host galaxies themselves. In my talk I will present some examples of high amplitude flares, some of them still ongoing after few years, from the very nucleus of either active or quiescent galaxies, showing their multi-wavelength photometric observations and spectroscopic evolution.
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Journal Clubs in 2023
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Date: Friday 17 November 2023
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Introduction to radar astronomy
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Presenter, Affiliation: Mikael Turkki, NOT
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Abstract: Radar is an invention that has been used in many applications since the 1900s. The simple idea of a transmitted signal and its backscattering from a solid object is important in many fields, such as traffic, medicine, military, and science. In the presentation, we will take a peek at radar astronomy and its targets. Both instruments and a couple of specific targets are discussed in the presentation, that will hopefully echo interest and intriguing discussion.
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Date: Wednesday 25 October 2023
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Españita 101
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Presenter, Affiliation: Alejandro Bermudo
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Abstract: A "brief" summary to understand the country, its people, and its culture. I hope that by the end we all understand why La Palma has a party every day
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Date: Friday 6 October 2023
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Lightning in a Bottle
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Presenter, Affiliation: Benjamin Hauptmann, NOT
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Abstract: Despite being known and feared for all of human history, the phenomenon of lightning is not well understood. In particular, the mechanism of cloud electrification eludes us.
The few measurements taken of thunderstorm E-fields have thus far been very limited in scope. In this presentation, I detail the development, construction and testing of a new, drone-based system to further these measurements. By gliding on columns of laminar updraft, our fixed-wing aircraft should be able to probe the deadliest regions of a thunderstorm, completely autonomously. This work culminated in a high-altitude test flight which almost ended successfully.
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Date: Friday 18 August 2023
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Astronomy and Sustainability
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Presenter, Affiliation: Alejandra DÃaz, NOT
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Abstract: As human civilization continues advancing, the concept of sustainability—the harmony between economic development, social equity, and the environment—is becoming more and more crucial. In 2015 the United Nations General Assembly set 17 Sustainable Development Goals with the aim to create a sustainable future for humanity by 2030. How can astronomy help meet these goals? The answer may surprise you!
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Date: Friday 14 July 2023
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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Title: Interacting Supernovae and when to find them
| Subtitle: Searching for late-time CSM interactions in SNe Ia in ZTF
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Presenter, Affiliation: Jacco Terwel, ING
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Abstract: Type Ia supernovae (SNe Ia) are among the brightest events in the universe, but despite decades worth of research the way they explode is still not exactly known. This is known as the progenitor problem. One piece that might help to solve this puzzle is the subclass of SN Ia-CSM: a supernova that interacts with circumstellar material. In this talk, I will give an overview of how to find these elusive objects, and what they can teach us about their past.
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Date: Friday 7 July 2023
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Clusters far-reaching influence on narrow angle tail radio galaxies
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Presenter, Affiliation: Kellie de Vos, ING
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Abstract: Galaxy clusters are the largest gravitationally bound objects in the universe, and are largely responsible for the environmental impacts of galaxy evolution. In this talk, I will discuss how these environmental effects can deform radio galaxies in such a way that we can determine their orbit around a galaxy cluster on the plane of the sky. Furthermore, I will present some unexpected results that indicate that there is more of an environmental impact on galaxy evolution in the outskirts of galaxy clusters than we previously thought, suggesting that these regions need more investigation.
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Date: Friday 30 June 2023
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Determining stellar properties using BASTA
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Presenter, Affiliation: Mark Lykke Winther, Aarhus University
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Abstract: As the quality of observations increases over the years, so too must the stellar pipelines in order to take advantage of these. This requires both accurate stellar models, and a fitting algorithm capable of correctly matching observations to models. In this talk, I will focus on the latter, by giving an introduction to the BAyesian STellar Algorithm (BASTA). It is a versatile pipeline for determining stellar properties, by fitting a multitude of different types of observations to a grid of stellar models or isochrones, to precisely infer parameters such as mass and age. Apart from a general overview of the code, I will also summarise my most recent publication, where I’ve used the pipeline to determine the history of the convective core of the star Kepler-444.
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Date: Friday 16 June 2023
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Hippos, the real stars
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Presenter, Affiliation: Kiran Jhass, ING
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Abstract: Hippos, like the subjects of many of your research, are dense balls of matter which vary in size, mass and colour. In this talk I will investigate the interactions, behaviours and characteristics which make them so fascinating and unique.
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Date: Friday 02 June 2023
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Observational study on two type IIb supernova
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Presenter, Affiliation: Niilo Koivisto, NOT
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Abstract: I will present master’s thesis where I performed photometric and spectroscopic analysis on two type IIb supernovae, 2017gkk and 2019gaf. The observations were obtained using the Nordic Optical Telescope (NOT) and they cover epochs from early days to about a year after the explosion. The motivation for this long time series of spectra and light curves was to better understand the physics of core-collapse supernovae and especially transitional type IIb SNe. I will also give short summary on observations and significance of this new beautiful supernova 2023ixf which so nearby (~7 Mpc) that we can almost touch it!
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Date: Friday 19 May 2023
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Building the local Milky Way halo – Investigating the origin of the local Milky Way stellar halo using Blue Straggler stars
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Presenter, Affiliation: Julie Thiim Gadeberg, NOT
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Abstract: Our current, leading theory describing the history of the Universe is the ΛCDM model. The model predicts that larger structures are formed through hierarchical clustering, and, thus, merger events are vital to the formation and evolution of larger galaxies such as the Milky Way. The remnants of such accretion events will be scattered throughout the Galaxy, building the Galactic halo that we can observe today.
In this Journal Club I will explain how the peculiar blue straggler stars in the local stellar halo can help support this hypothesis by presenting the work I did during my masters thesis. Due to the origin story of these stragglers their number will differ depending on the mass and type of the astronomical object in which they are born, making them ideal for our purpose. It takes nothing more than a simple population count, and with the dawn of the Gaia spacecraft counting has never been easier.
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Date: Friday 21 April 2023
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: WEAVE: instrumental and science opportunities for ING students
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Presenter, Affiliation: Marc Balcells, ING
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Abstract: In the coming decade WEAVE will be a key instrument for European astronomy. We will introduce the instrument characteristics and capabilities, with an emphasis on recent results from commissioning. We will then go over the eight WEAVE surveys and the teams that lead them, and will emphasize the opportunities for access throught the surveys and through open time.
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Date: Friday 24 March 2023
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Sky is the limit - Measuring the airglow continuum
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Presenter, Affiliation: Joonas Uljas, University of Copenhagen
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Abstract: With the dawn of 40-meter class era, the main noise sources in astronomical observation are moving away from detectors and are becoming solely dominated by the sky. The line emission component of the night time atmosphere is quite well known, but the existence and characteristics of its continuum component is still debated in the literature. Airglow continuum is challenging to measure due to its faintness, and the fact that the diffraction gratings, the main dispersive elements in astronomical spectrographs, are prone to produce scattered light. In presence large amount of bright emission lines, such as the hydroxyl lines in the near infrared, this scattered light can seem as continuum. A new type of echelle spectrograph has been purpose designed and built for measuring the airglow continuum. I will discuss the first impression of the project.
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Date: Friday 10 March 2023
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: A walk through fresh AstroNews
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Presenter, Affiliation: James Munday & Judith Santos, ING
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News link(s): |
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Date: Friday 24 February 2023
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Common envelope evolution: From binary star chrysalis to cosmic butterfly
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Presenter, Affiliation: David Jones, IAC
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| Abstract: Planetary nebulae are some of the most strikingly beautiful astrophysical phenomena known, gracing many a glossy-paged, coffee-table book and earning them the nickname "cosmic butterflies". While classical stellar evolutionary theory states that planetary nebulae are the end products of intermediate mass stars, forming as the star leaves the Asymptotic Giant Branch and evolves towards the white dwarf phase, it is now clear that a significant fraction of planetary nebulae originate from a binary evolutionary pathway. As the immediate products of the common envelope, close-binary central stars of planetary nebulae offer a unique tool with which to study this rather poorly understood phase of binary evolution. Furthermore, as the nebula itself represents the ionised remnant of the ejected common-envelope, such planetary nebulae can be used to directly probe the mass, morphology and dynamics of the ejecta. Here, I will summarise our current understanding of the importance of binarity in the formation of planetary nebulae as well as what they can tell us about the common envelope phase - including the possible relationships with other post-common-envelope phenomena like novae and type Ia supernovae.
News link(s): |
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Date: Friday 10 February 2023
| Time: 16:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Dwarves and giants as guardians of the galaxy
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Presenter, Affiliation: Jeppe Thomsen, NOT
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| Abstract: For eras untold, the fire giants have kept the secrets of the galactic out of our grasp through trickery and subterfuge. But as they pair up with friend or foe, the eclipse will reveal the path ahead.
News link(s): |
Journal Clubs in 2022
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Date: Friday 07 December 2022
| Time: 17:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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| Title: Binary Star systems
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Presenter, Affiliation: James Munday, ING
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News link(s): MNRAS |
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Date: Friday 02 December 2022
| Time: 17:00 hrs
| Place: Mayantigo building, 6th floor meeting room
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Date: Friday 20 May 2022
| Time: 16:00 hrs
| Place: online
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| Title: Modelling Post-Common Envelope Binaries
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Presenter, Affiliation: George Hume, ING
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Paper link(s): RNAAS |
News link(s): |
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Date: Friday 13 May 2022
| Time: 15:00 hrs
| Place: online
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Date: Friday 29 April 2022
| Time: 16:00 hrs
| Place: online
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Date: Friday 22 April 2022
| Time: 16:00 hrs
| Place: online
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Date: Friday 08 April 2022
| Time: 16:00 hrs
| Place: online
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Date: Friday 04 February 2022
| Time: 16:00 hrs
| Place: online
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Past Student Seminars:
Journal Clubs in 2021
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Date: Friday 10 December 2021
| Time: 16:00 hrs
| Place: online
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Date: Friday 3 December 2021
| Time: 16:00 hrs
| Place: online
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| Title: On the fragility of thin-discs in early-type galaxies
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Presenter, Affiliation: Pablo Galan, ING
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|
Date: Friday 26 November 2021
| Time: 14:00 hrs
| Place: online
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Date: Friday 21 May 2021
| Time: 19:00 hrs
| Place: online
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Date: Friday 14 May 2021
| Time: 16:00 hrs
| Place: online
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| Title:Analysing the chemical abundance space of the Galactic disc with machine-learning methods
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Presenter, Affiliation: Ignacio Garcia, ING
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Date: Friday 7 May 2021
| Time: 16:00 hrs
| Place: online
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| Title:Effect of satellite constellations on observational astronomy
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Presenter, Affiliation: Nada Ihanec, ING
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| |
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Date: Friday 23 April 2021
| Time: 17:30 hrs
| Place: online
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Title: Detection of large-scale X-ray bubbles in the Milky Way halo
Paper Authors: P. Predehl et. al.
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Presenter, Affiliation: Akke Viitanen, NOT
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Paper link(s): nature |
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News link(s): Article 1 (AI) |
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Date: Friday 12 February 2021
| Time: 16:00 hrs
| Place: online
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Date: Friday 4 February 2021
| Time: 16:00 hrs
| Place: online
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​​​​​ |
Date: Friday 21 January 2021
| Time: 16:00 hrs
| Place: online
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| Title:Asteroid and meteorite compositional studies by modeling light scattering
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Presenter, Affiliation: Julia Martikainen, NOT
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Journal Clubs in 2020
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Date: Wednesday 02 December 2020
| Time: 18:00 hrs
|
Title:
Close binary stars and their evolution towards planetary nebulae
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Presenter, Affiliation: James Munday, IAC
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| |
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Date: Thursday 23 July 2020
| Time: 16:00 hrs
| Place: online
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Date: Friday 17 July 2020
| Time: 16:00 hrs
| Place: online
|
Titles:
Cell invasion studies using Two Photon Polimerization technique; Extragalactic Background light from the HST CANDLES survey; Stellar continuum fitting of UV spectra
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Presenter, Affiliation: Alberto Saldana, UNIGE
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Paper link(s): RSEF |
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Date: Friday 26 June 2020
| Time: 16:00 hrs
| Place: onilne
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Date: Friday 5 June 2020
| Time: 16:00 hrs
| Place: Casa Tey
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Title:
Discussions: exo-comets and exo-moons
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|
Date: Friday 29 May 2020
| Time: 16:00 hrs
| Place: online
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Date: Friday 22 May 2020
| Time: 16:00 hrs
| Place: online
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Date: Friday 15 May 2020
| Time: 16:00 hrs
| Place: online
|
Title:
Spatial Density and Model of Meteoroid Population.
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Presenter, Affiliation: Martin Balaz, GTC
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Title:
THELI v3.
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Presenter, Affiliation: Viktoria Pinter, ING
|
News link(s): Article 1 (Supernovae) |
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Date: Friday 8 May 2020
| Time: 16:00 hrs
| Place: online
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|
Date: Friday 24 April 2020
| Time: 16:00 hrs
| Place: online
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|
Date: Friday 17 April 2020
| Time: 16:00 hrs
| Place: online
|
Title:Mechanical Engineering for Scientific Infrastructures
|
Presenter, Affiliation: Carlo Zanoni (Mechanical Engineer at ESO)
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| |
Title: WHT laser beacon
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Presenter, Affiliation: Pinter Viktoria, ING
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Paper link(s): Article 1., Article 2., Article 3., Article 4., |
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Date: Friday 10 April 2020
| Time: 16:00 hrs
| Place: online
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| Title: Starling satellites and their effect on ground based observations
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Presenter, Affiliation: Jacob Hibbert, ING
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News link(s): BepiColombo, Borisov a., Borisov b. |
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Date: Friday 3 April 2020
| Time: 16:00 hrs
| Place: online
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Title: A pulsating white dwarf in an eclipsing binary
Paper Authors: Steven G. Parsons, et. al.
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Presenter, Affiliation: James Munday, GTC
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Paper link(s): nature, IAC |
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Title: Discovery of a giant radio fossil in the ophiuchus galaxy cluster
Paper Authors: S. Giacintucci, et. al.
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Presenter, Affiliation: Tom Steinmetz, ING
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|
Paper link(s): arXiv |
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| |
Title: High accuracy on H0 constraints from gravitational wave lensing events
Paper Authors: P. Cremonese and V. Salzano
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Presenter, Affiliation: Macarena Garcia, ING
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Paper link(s): arXiv |
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Date: Friday 27 March 2020
| Time: 16:00 hrs
| Place: online
|
| Title: Tunable/ interference photometric filters
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Presenter, Affiliation: Joonas Viuho, NOT
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Date: Friday 20 March 2020
| Time: 16:00 hrs
| Place: online
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Title:
Tidally trapped pulsations in a close binary star system discovered by TESS
Paper Authors: G. Handler, et. al.
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Presenter, Affiliation: David Jones (IAC)
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|
Paper link(s): nature , IAC |
|
Date: Friday 6 March 2020
| Time: 16:00 hrs
| Place: Mayantigo building 6th floor meeting room
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Date: Friday 28 February 2020
| Time: 16:00 hrs
| Place: Mayantigo building 6th floor meeting room
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Date: Friday 14 February 2020
| Time: 16:00 hrs
| Place: Mayantigo building 6th floor meeting room
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Title: Secularly powered outflows from AGN: the dominance of
non-merger driven supermassive black hole growth
Paper Authors: R. J. Smethurst, et. al.
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Presenter, Affiliation: Macarena Garcia, ING
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|
Paper link(s): arXiv |
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Title:
ALMA catches beautiful outcome of stellar fight
Paper Authors: H. Olofsson, et. al.
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Presenter, Affiliation: David Jones, IAC
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Paper link(s): ESO |
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Date: Friday 7 February 2020
| Time: 16:00 hrs
| Place: Mayantigo building 6th floor meeting room
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Title: A Galactic-scale gas wave in the solar neighbourhood
News
Paper Authors: João Alves, et. al.
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Presenter, Affiliation: Tereza Jerabkova, GTC
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Paper link(s): nature, Radcliffe institute news |
Presenter, Affiliation: Jacob Hibbert, ING
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Software Description: phoebe
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Date: Friday 31 January 2020
| Time: 16:00 hrs
| Place: Mayantigo building 6th floor meeting room
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Title: A limit on Planck-scale froth with ESPRESSO
News
Paper Authors: Cooke, Ryan; Welsh, Louise; Fumagalli, Michele; Pettini, Max
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Presenter, Affiliation: Jacob Hibbert, ING
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|
Paper link(s): arXiv |
|
News link(s): Article 1 , Article 2a , Article 2b , Article 3 , Article 4 |
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Date: Friday 24 January 2020
| Time: 16:00 hrs
| Place: Mayantigo building 6th floor meeting room
|
Title:
A wide star-black-hole binary system from radial-velocity measurements
Paper Authors: Jifeng Liu, Haotong Zhang, Xiangqun Cui, et. al.
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Presenter, Affiliation: Tereza Jerabkova, GTC
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|
Paper link(s): nature |
|
Related papers: Paper 1 , Paper 2 , Paper 3 , Paper 4 , Paper 5 , Paper 6 |
Journal Clubs in 2019
|
Date: Friday 29 November 2019
| Time: 16:00 hrs
| Place: Mayantigo building 6th floor meeting room
|
|
Date: Friday 22 November 2019
| Time: 16:00 hrs
| Place: Mayantigo building 6th floor meeting room
|
|
Date: Friday 15 November 2019
| Time: 16:00 hrs
| Place: Mayantigo building 6th floor meeting room
|
Title:
A BlueSONG; Tracing magnetic activity in the Ca II H & K lines of solar-type star using eShel, a commercial spectrograph mounted on the Hertzsprung SONG telescope
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Presenter, Affiliation: Nicholas Emborg Jannsen, NOT
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|
News link(s): Article 1, Article 2 |
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Date: Friday 8 November 2019
| Time: 15:30 hrs
| Place: Mayantigo building 6th floor meeting room
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|
Date: Wednesday 23 October 2019
| Time: 09:30 hrs
| Place: Mayantigo building 6th floor meeting room
|
Title:
CCDs
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Presenter, Affiliation: Joonas Viuho, NOT
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|
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|
Date: Friday 18 October 2019
| Time: 09:30 hrs
| Place: Mayantigo building 6th floor meeting room
|
Title:
Proving the outstanding capabilities of ImagingAtmospheric Cherenkov Telescopes in high timeresolution optical astronomy
Paper Authors: T. Hassan, M. K. Daniel, for the VERITAS Collaboration (DESY Germany, CfA Arizona, USA)
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Presenter, Affiliation: Maria de la Macarena Garcia, ING
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|
Paper link: arXiv |
|
Date: Friday 11 October 2019
| Time: 09:30 hrs
| Place: Mayantigo building 6th floor meeting room
|
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Contact:
Last modified: 27 March 2025
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