professional astronomer at ULiège • exoplanet imaging, infrared instrumentation, image processing, machine learning
Belgium
Joined July 2014
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Sad day for the Belgian carbon footprint: the new government confirms the replacement of nuclear plants by new gas plants for 2025. Check out the expected impact on the electricity mix as foreseen by the Federal Planning Bureau. How can that help address the climate crisis?
Olivier Absil retweeted
I'm happy to share that my first PhD paper was published today in @ScienceMagazine, featuring the analysis of the #jwst spectrum of a planet-forming region around a young star revealing an extremely carbon-rich gas composition. The paper: doi.org/10.1126/science.adi8… #ScienceResearch
The star, ISO-Chal 147, is just one to two million years old. The 13 different carbon-bearing molecules Webb detected within its planet-forming disk include the first detection of ethane outside of our solar system, as well as ethylene, propyne, and more.
ALT Spectrum: Graph labeled “Very low-mass star, ISO-ChaI 147, Hydrocarbons in protoplanetary disk, MIRI medium resolution spectroscopy.” The x-axis is labeled “Wavelength of Light, microns” and extends from 6 to 17 microns with tick marks every 2 microns. The y-axis is labeled “Brightness” and has an up arrow labeled “brighter” and a down arrow labeled “dimmer.” A jagged dark-gray line with various peaks extends horizontally. Five peaks are highlighted with colored vertical bands, and the data line within the bands is a brighter gray. They are: methane (CH4) from about 7 to 8.5 microns, ethane (C2H6) from 11.5 to 12.6 microns, cyanoacetylene (HC3N) at about 15.2 microns, propyne (C3H4) at about 15.8 microns, and methyl radical (CH3) from 16.3 to 16.8 microns.
Olivier Absil retweeted
An international team led by @adityamarabhavi used #JWST to reveal the richest chemical diversity observed to date in a protoplanetary disc and improve our understanding of the diversity of planetary systems. Proud to be part of it ! @Valentin__C
sciences.uliege.be/cms/c_127…
ALT ©NASA/JPL-Caltech/T. Pyle | Artist's view of a young star surrounded by a protoplanetary disc in which planets are in the process of forming.
Olivier Absil retweeted
📢 Open PhD position in my group, on simulation-based inference and generative models for particle physics, on a joint project with Fabio Maltoni and Tilman Plehn inspirehep.net/jobs/2769416
Olivier Absil retweeted
In order to ensure Europe’s competitive edge in global science and technology, the ERC Scientific Council calls for a doubling of the budget of the next EU research framework programme (FP10) and maintaining the ERC’s independence.
Read the statement: erc.europa.eu/news-events/ne…
Olivier Absil retweeted
Read our latest #research on the spectrum of one of the coldest brown dwarfs taken with @ESA_Webb @NASAWebb published in @Nature! I co-led this work together with @paulmolli and @David_Barrado and contributions from the awesome MIRI GTO team! Cool story by @ETH_physics 👇
Follow the ammonia trail to #exoplanets, say researchers including @C_Patapis and @adiglauser in a paper just published in @Nature.
Here's the link to the article: nature.com/articles/s41586-0…
And here's our news piece: phys.ethz.ch/news-and-events…
#JWST #astrophysics @ETH_en
Great stuff from the whole MIRI-EU exoplanet GTO team! Proud to be part of it.
A team of scientists has successfully measured the isotopes of #ammonia in the atmosphere of #WISEJ1828. This study demonstrates that the isotopic abundance of ammonia can be used to study the formation of giant gas planets. @Nature
psilab.uliege.be/cms/c_12060…
Olivier Absil retweeted
A study led by MIRI mid-INfrared Disk Survey (#MINDS) GTO program, including researchers from #ULiège, using @NASAWebb leads to the first detection of water in a disc containing forming planets 💦🌎🛰️ #PDS70 @mpi_astro @Nature @Valentin__C @AbsilOli 👇
psilab.uliege.be/cms/c_11570…
Olivier Absil retweeted
Interested in exoplanet imaging? We are hiring! @IvS_KULeuven kuleuven.be/personeel/jobsit…
Olivier Absil retweeted
1/7 Amazing story about citizen science & why you should make your data public, a🧵... @Valentin__C @astroclaui @MonashAstro
Olivier Absil retweeted
Located 374 light years away from Earth, #HD169142b has been confirmed as the third #protoplanet to date by a team of researchers from @UniversiteLiege and @MonashUni. @OxUniPress @Valentin__C @ESO @AbsilOli @frsFNRS - sciences.uliege.be/cms/c_109…
Olivier Absil retweeted
Registrations open for the VLTI school in Budapest: vltischool2023.konkoly.hu/
Olivier Absil retweeted
📢New paper: Neural Posterior Estimation for Exoplanetary Atmospheric Retrieval -- or how to apply simulation-based inference to study the atmospheres of exoplanets? A team effort with @Vasist47 @FrancoisRozet @paulmolli @AstroEvert and @AbsilOli 👇🧵 arxiv.org/abs/2301.06575
Olivier Absil retweeted
.@ultracricket and @ClimateHuman, two very respected colleagues of ours, were sanctioned for #ClimateAction during #AGU. This is unacceptable retaliation against scientists speaking out for #ClimateJustice. Please sign the letter of support until Sat here: forms.gle/SiF6rf2944P354UK6
Olivier Absil retweeted
Finally got around to uploading the 12-year HR 8799 time lapse onto my website. You can now download it here: jasonwang.space/orbits!
Thanks to @AstroWrt for reducing the new data (and check out his paper arxiv.org/abs/2210.14213)
Olivier Absil retweeted
We are hiring! The SCIFY team of @IvS_KULeuven is looking for a new postdoc to work on instrumentation for exoplanet imaging kuleuven.be/personeel/jobsit…
Five 3-yr postdocs open in Belgium to work on JWST data: jobregister.aas.org/ad/678b8… The 1st one (@KU_Leuven + @ULiegeResearch) aims to use a new exoplanet atmospheric retrieval tool based on neural posterior estimation, developed with @glouppe and @paulmolli (stay tuned for paper).
Olivier Absil retweeted
🚨 Breaking 🚨 The European Parliament just called for nation-states to “work on developing a Fossil Fuel Non-Proliferation Treaty” in its formal #COP27 resolution.
This is a major development in the global push for a #FossilFuelTreaty.
More at fossilfueltreaty.org/eu or in 🧵
Olivier Absil retweeted
I am very proud to announce with my advisor @glouppe the official release of LAMPE, a simulation-based inference package that focuses on amortized posterior estimation.
Check it out at github.com/francois-rozet/la… and read the 🧵 for more information. (1/4)
Olivier Absil retweeted
Just minutes ago, the President of Vanuatu stood up at #UNGA & became the 1st nation-state to call for a #FossilFuelTreaty
This isn’t just about building more momentum – it's a pivotal step towards diplomatic engagement for a treaty. Read more & follow 🧵
fossilfueltreaty.org/vanuatu
