Très fier d’avoir reçu le Grand Prix de l’innovation SAF ! 🏆 Nous avons été récompensés par la Société astronomique de France et son président, Roland Lehoucq pour le projet #SUNSCAN by #STAROS. Une réussite collective avec V. Desnoux, C. Buil, O. Garde et Matthieu Le Lain (@matlastro.bsky.social)

Exceptional! The faint blur you see in this NIRCam image refers to GS-NDG-9422, a "strange" galaxy identified with the JWST and announced in 2024. ➡️ science.nasa.gov/missions/web... Credits: NASA, ESA, CSA, STScI, Alex Cameron (Oxford) 🔭 🧪 #science #extragalactic #cosmology #JWST #Webb 1/5

Orbital parameters of the bright binary alpha Draconis based on amateur spectra from the STAROS database. G. Bertrand et. al. https://arxiv.org/abs/2511.17206

Gaia will find ~120,000 exoplanets, mostly super-Jupiters! From 2014–2025 at L2, it tracked >1B stars so precisely: a pinhead on the Moon from Earth! Full data by 2030; first release predicts 7,500 planets. Also: hypervelocity stars, quad systems & ancient galaxy merger remnants. 🔭 🧪 #science

For Day 21 of #spacetober_challenge prompt star: trailblazing US #astronomer Annie Jump Cannon (1863 – 1941), here with her stellar classification system which sorted stars based on spectral types, revealing their temperature from hot blue to cool red stars: O,B,A, F, G, K & M. 🧪🐡👩🏼‍🔬🔭#histsci 🧵

Bonne nouvelle pour les francophones, le livre sur Siril est disponible à la précommande, avec une réduction valable tout le mois de septembre !! siril.fr/commander/

Sweet NASA feature article on @sabinastro.bsky.social's work on mapping stellar surfaces: 🔭🧪 #stellarastro science.nasa.gov/missions/tes... Why? Because: 1) #StarsAreStillInteresting 2) Messy stars complicate our view of exoplanet atmospheres. To remove stellar contamination, you must map it. 🗺️

Betelgeuse is a double! Fun to learn something new about a familiar star.

It’s paper day 🎉!! If you are interested in seeing how supergranulation changes over a solar cycle in RVs give it a read! arxiv.org/abs/2506.23693

Spectroastrometry and Reverberation Mapping of Active Galactic Nuclei. II. Measuring Geometric Distances and Black Hole Masses of Four Nearby Quasars. Yan-Rong Li et. al. https://arxiv.org/abs/2502.18856

MY FIRST EVER ARTICLE FOR SCIENTIFIC AMERICAN IS OUT!!! It's all about how black holes shred stars and how we discovered that black holes "burp" after eating them, and even includes a black hole called Jetty McJetface! What's not to love? 🤩 www.scientificamerican.com/article/why-... 🔭🧪🎢

Finding out about Gaia at #EAS2025Cork! ☄️ Just announced: Gaia DR4 will be released in December 2026!

Here's a cool spectro and photometry experiment to measure the mass of supermassive black holes from your backyard :) Based on single-epoch estimators in broad-line AGN. 🌈🔭 #astrophysics #astronomy #spectroscopy #photometry guillaumebertrand.notion.site/Estimating-b...

Happy to announce that the line-detector.oca.eu website is now online! It allows the user to select the stellar type, [M/H], λ- range, and resolving power and the page returns: -purity of the line and minimum S/N required to detect it. -interactive plot to identify the lines in the spectra

We found the most distant confirmed galaxy (some Sergej Boebka vibes 😅) arxiv.org/abs/2505.11263

This is the globular cluster M15, imaged by Hubble. It's a great target for binoculars or backyard telescopes, in the constellation Pegasus. Jiaqi Ying et al. measured M15's age with 3% precision. This group of stars formed *immediately* after the Universe did. arxiv.org/abs/2505.02969 🔭🧪 #stars

Been an exciting week for @galaxyzoo.org - our relaunch with JWST imaging has resulted in highest daily classification rate since March 2020. www.galaxyzoo.org. 🔭👩‍🔬🎉

Interested in stellar physics? Orlagh L. Creevey has posted their lecture notes & recorded lecture from a day-long introduction to stellar physics with Gaia! #astroedu #stellarastro 🔭 🧪

The new official paper/poster browser for ICLR 2025 is out. Enjoy! iclr2025.vizhub.ai #iclr #ai #iclr2025

📢 New dataset out! We introduce HypoGen💥, a dataset of ~5.5K structured problem–hypothesis pairs (Bit–Flip–Spark + Chain‑of‑Reasoning) to advance LLM-driven scientific ideation💡. Fine‑tuned LLaMA 3.1 8B & R1‑distilled models show significant gains. Humans are still the best🥇.

Excited to announce our new paper as part of our 2^2 week: AstroLLaVA, a vision language model for astronomy that enables natural dialogue with astronomical imagery! Shout out to Sharaf Zaman for leading this work arxiv.org/abs/2504.08583 🔭☄️

Was great fun cooking this up with Sharaf and team! Check out all the code at github.com/UniverseTBD/... and paper at arxiv.org/abs/2504.08583

PRIX DE THESE #SF2A 2025: Le conseil de la SF2A a l'honneur de décerner le prix de thèse 2025 à Giulia Pagnini pour sa thèse: "L'évolution précoce et tardive de notre Galaxie à travers la lentille des amas globulaires", au laboratoire GEPI, observatoire de Paris, sous la direction de P. Di Matteo.

Nice paper out today by Francisco Carrasco-Varela et al. looking at blue straggler stars in #galactic open and globular clusters! ☄️ #stellarastro These weird stars form in mergers, and in their comprehensive survey they find an increasing fraction with age and multiple 'bumps' over time.

Anyways, here's the paper - it's one of the first big uses of foundation models in astronomy that I'm aware of, and it seems to have worked really well! #extragalactic #astrocode 🧪

~2h to go until @esa.int and the Euclid Consortium release the first 63 deg² of #Euclid survey science data plus 34 papers to go with this "Q1"-release. More here: www.esa.int/Science_Expl... Press releases and directions for data access will follow at the same time. #astronomy #space #science

⏰ Have you set your alarm for 12:00 CET / 11:00 GMT today? Be ready to be amazed at the latest treasures uncovered by #ESAEuclid, our #DarkUniverse detective 🕵️ Watch this space for details & this link for a video premiere: www.youtube.com/watch?v=rXCB... 🔭🧪 #astrosci

One thing that particularly caught my eye is that they also do empirical photometric corrections using open clusters. Stellar models are usually still a bit wrong, so this correction step is probably a big bonus for their accuracy #galactic #stellarastro paper: arxiv.org/abs/2503.02227

Paper number 2 of the day is by Josh Speagle et al., and is a new (open source!) code for inferring stellar paramaters! #galactic #stellarastro Very excited to finally see this work get published - it is a monstrously well thought through statistical framework for calculating accurate parameters!

Check out the press release for our recent work using JWST observations of SIMP0136! Also published today on ApJL: iopscience.iop.org/article/10.3...

One of the possible supervisors is Diane and let me tell you, she‘s one of the most awesome women I‘ve met. Want a great supervisor for your PhD? This is your chance! 🔭 ⭐ 🪐 ⬇️⬇️⬇️

Tired of wondering which atomic lines are in your spectra? You need: *whose line is it anyway?* An interactive tool for identifying atomic spectral lines. 🧪🔭 #stars install: pip install whoseline source: github.com/bmorris3/who...

Truly out of science fiction! 😲 Using ESO's #VLT, astronomers have mapped the 3D structure of an exoplanet's atmosphere for the first time. This atmosphere behaves in ways that challenge our understanding of how weather works. 🔭 🧪 #exoplanets https://www.eso.org/public/news/eso2504/

In 2018, I wondered (w/ @ericagol.bsky.social + @jradavenport.com) if the new Gaia mission would map stellar positions precisely enough to see stars wiggle as their dark spots move across their surfaces surfaces. This star comes *so* close. #stars 🧪🔭

The expansion rate of the universe remains elusive. Using Type Ia supernovae, the rate was measured to be H0 = 73.24±1.74 (km/s)/Mpc arxiv.org/pdf/1910.02978

I'm very excited to share that my first (and first-author) publication is up on the arXiv today! arxiv.org/abs/2501.16429 We studied a circumbinary brown dwarf companion in the Pleiades with direct imaging taken using both apertures of the Large Bincocular Telescope.

Excited to announce the Multimodal Universe (MMU): a huge 100TB dataset bringing together the largest ML-focused collection of astronomical observations ever assembled to accelerate open AI and astronomy research github.com/MultimodalUn... Think ImageNet, but for space 🔭 #astrocode 🧵

🧵 Today with @polymathicai.bsky.social and others we're releasing two massive datasets that span dozens of fields - from bacterial growth to supernova! We want this to enable multi-disciplinary foundation model research.

Check out the latest find from the Young Worlds Lab, led by UNC Graduate Student Madyson Barber (madysonb.github.io). Newborn planet found in a warped system www.nature.com/articles/d41... www.nature.com/articles/s41... 🧪🔭🪐⚛️🌌⭐

The Milky Way represents an outlier among similar galaxies, universe survey data shows : news.stanford.edu/stories/2024...

#ESAEuclid's 1st public search project for strong gravitational lenses is now also officially live at 'Space Warps – ESA Euclid'. We're aiming at classifying 100,000 galaxies in this project. Here's our blog post with more background: www.euclid-ec.org/space-warps-... #astronomy #space #science

Astronomers have discovered one of the youngest known planets, just 3 million years old, giving us a window into early planet formation. Story by me in New Scientist www.newscientist.com/article/2456...

Were happy to announce #Euclid #SpaceWarps - our first citizen science search for gravitational lenses in #ESAEuclid data. Curious? Join our #CitizenScience project on the #Zooniverse: www.zooniverse.org/projects/apr... #astronomy #space #science #cosmology

Big paper day today! 🔭🧪 The newest results from the Dark Energy Spectroscopic Instrument or DESI newscenter.lbl.gov/2024/11/19/n... 8 new papers on the arXiv this morning, including the long awaited analysis of the "full shape" of the galaxy power spectrum, and one led by my PhD student.

New blog post #astronomy #extragalactic 🔭🪐 Dusty Galaxies medium.com/@benne.holwe... astrobenne.blogspot.com/2024/11/dust...

Brandon Pries reports for @astrobites.bsky.social on the potential discovery of a dark-matter-free dwarf galaxy hiding in the tentacle of a jellyfish galaxy. aasnova.org/2024/11/19/n... 🔭

Love astronomy, astrophysics, and science communication? Come join the Astrobites team! Applications due November 27th. ✨🔭 astrobites.org/2024/10/27/a...

Figured I would get in on this whole starter pack thing and list (in whatever order bsky chooses) scientists working on studying galaxies (broadly defined, including galaxy formation/evolution + near-field cosmology). If I missed you and you'd like to be added, let me know! 🧪🔭 go.bsky.app/5ZZtqDy

A JWST Project on 47 Tucanae. NIRSpec Spectroscopy of Multiple Populations Among M dwarfs astrobiology.com/2024/06/a-jw... #astrobiology #astrochemistry #spectroscopy