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Gijs D Mulders

@gijsmulders.com
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Exoplanet Astronomy Assistant Professor Santiago de Chile gijs.cl \m/

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Gijs D Mulders @gijsmulders.com · 23/09/2026
A great thread on rocky (exo) planets with awesome graphics for the #exoplanets feed
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Paul Byrne @theplanetaryguy.com · 23/09/2026
I said I'd do a thread about my new Space Science Reviews paper, so here it is! This is part of a collection of papers arising from a meeting at the International Space Science Institute in Bern in 2024: a workshop to better understand rocky extrasolar planets. A 🧵:
Interior structure models of Earth, Venus, Mercury, Mars, the Moon, and Io, all shown to scale and key elements labelled.
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Seven Machina Rasmussen @toomanyspectra.bsky.social · 19/07/2026
ever wonder: 🛸 are aliens real? ☀️ is our solar system unique? 🌍 how can we tell if there’s life on another planet? 📈 should we destroy capitalism? 🧑‍🔬 how could i become an astrobiologist? CLOUDY WITH A CHANCE OF STARSHIPS has the answer! www.barnesandnoble.com/w/cloudy-wit...
barnesandnoble.com
Cloudy with a Chance of Starships: How the Drake Equation Reveals the Odds of Life in the Cosmos
Barnes & Noble’s online bookstore for books, NOOK ebooks & magazines. Shop music, movies, toys & games, too. Receive free shipping with your Barnes & Noble Membership.
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Joanna Drążkowska @astrojoanna.bsky.social · 22/07/2026
Our latest paper has been accepted for publication! 🎉 We demonstrated that a single late infall event perturbing the outer disk can trigger the formation of multiple giant planets and ringed disk structures resembling those observed around young stars. Paper: arxiv.org/abs/2607.18370
Figure from the paper with two rows and four columns. The upper row shows the results of the dust evolution and planet formation model. The bottom row shows synthetic observations of these snapshots. The model starts with single dust ring caused by late infall at around 80 au. In the next snapshot at 0.75 Myr, one giant planet formed and split the initial ring in two. At 1.05 Myr the planet has migrated inward, and a new planet emerged around the location of the original ring. This evolution continues, and at 1.7 Myr we have 3 giant planets at around 16 au, 23 au, and 40 au, and 3 dust rings, each located just inside of a planet.
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Institute of Astrophysics UC @astrouc.bsky.social · 07/07/2026
🔭 Applications are now open for the Doctoral and Master Program in Astrophysics at the Institute of Astrophysics UC. 🌌 Research excellence across galaxy evolution, exoplanets, cosmology, stellar populations & more 💰 Full scholarships & stipends for all admitted students 📅 Deadline: July 31, 2026
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Seven Machina Rasmussen @toomanyspectra.bsky.social · 03/07/2026
here you go!!
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Bibiana Prinoth @handle.invalid · 26/06/2026
Last week, I uploaded my first first-author paper as Dr. Prinoth to arXiv, and I finally have time to tell you about it. This one has been a long time coming, and I'm incredibly happy and proud that it's finally out in the #exoplanets world! 🔗 arxiv.org/abs/2606.14490 1/n
arxiv.org
A population view of transiting hot giant exoplanets: Tracing Fe and Ti chemistry with ESPRESSO and MAROON-X
Hot and ultra-hot Jupiters offer a unique laboratory to study atmospheric chemistry at the population level using ground-based high-resolution spectroscopy. Fe and Ti are key tracers of thermal and ch...
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Sean Raymond (planetplanet.net) @planetplanet.bsky.social · 20/05/2026
I love this new paper about planets in AGN disks around supermassive black holes! arxiv.org/abs/2605.19241 Naturally, it also helps to motivate some of the crazy planetary systems I've built: planetplanet.net/2018/06/01/t...
arxiv.org
Active Galactic Nucleus Tori: Potential Birthplace to Millions of Planets
The outer regions of AGN disks have temperatures similar to those of circumstellar disks, permitting dust condensation. Therefore, planet formation and growth could be active in these dust tori throug...
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Randall Munroe @xkcd.com · 18/05/2026
Speedrun xkcd.com/3246/
Comic. [Person 1 sitting at desk typing on laptop while Person 2 with shoulder-length hair stands behind.] PERSON 1: Aw man, speedrun.com removed my world record just because I listened to lateralus and ænima to get in the flow. PERSON 2: Oh, a copyright thing? PERSON 1: No, they don’t allow tool-assisted speedruns.
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astronomie.nl @astronomienl.bsky.social · 13/05/2026
Masterstudent UvA ontdekt ‘amandelvormige’ exoplaneet op rand van uiteenvallen www.astronomie.nl/nieuws/maste...
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Steve Desch @deschscoveries.bsky.social · 08/05/2026
New HR diagram mnemonic dropped: Very Bad Computer Program Gives Me Misinformation
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Linn Boldt-Christmas @nplinnspace.bsky.social · 07/05/2026
🔭 A cautionary tale for undergrads (and above!) using AI for #astro plots: our BSc student wanted to make a "quick" HR diagram showcasing M-dwarfs & thought some chatbot could make one and... well... ...extra credits are now offered to students who can correctly find all errors on cursedHR.png 🫠 🧪
A pathetic attempt by AI sloppery to make a HR diagram, generated by one of our BSc student, and shared here with their permission. Honestly, I can't even begin to explain all the deviations. Imagine a normal HR diagram but one that appears to you in a fever dream. It gets so much worse the longer you look at it. WHY IS THIS ALLOWED TO EXIST AAAAA
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David Kipping @davidkipping.bsky.social · 30/04/2026
Fund NASA science or we’re demoting it again to comet.
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Matthew Kenworthy @mattkenworthy.bsky.social · 29/04/2026
Casassus+ on Hourly radio variability of PDS70c from time-differential photometry using the ALMA array to see fluctuations around this exoplanet and circumplanetary disk. Very cool to see how quickly this flux can change! #astrodon #exoplanets
Three panels showing the radio images of the PDS 70 system. Each panel has a tilted ellipse representing dust in the system, and a zoomed in box shows the location of the planet PDS70c. Radio flux is not present in the first two epochs, but is clearly detected in the third panel.
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Kevin Hardegree-Ullman @kevinkhu.bsky.social · 01/04/2026
New research note accepted to RNAAS! Yes, this is a serious science post today. 🧪 We've created a catalog of Gaia DR3 IDs that correspond to TESS Input Catalog IDs! No more cross-matching on your own or hoping the Gaia DR2/DR3 IDs are the same! arxiv.org/abs/2603.28850 🔭 #exoplanets
arxiv.org
Gaia DR3 IDs for TESS Input Catalog Targets
The TESS Input Catalog (TIC) was built on Gaia Data Release 2 (DR2). To date, there has not been an update to the TIC to incorporate Gaia Data Release 3 (DR3) IDs. In this Research Note, we outline ho...
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Randall Munroe @xkcd.com · 23/03/2026
Star Formation xkcd.com/3222/
4-panel comic. (1) [Glowing black dot surrounded by clouds.] DOT: I think I did a good job with this universe. Pressure waves dance through gas clouds. They clump together and then pressure pushes them apart. (2) [Some of the clouds are clumping together.] DOT: Oh weird, that big clump of clouds is staying together. Their gravity is overcoming the pressure and more gas is falling in. (3) [More clouds are sucked in.] DOT: It’s not stopping! The heat is rising but the collapse is only accelerating! I messed up. I messed up *bad*. (4) [The clump has become a shining star.] DOT: NOOOOOOOO!!! My beautiful clouds! Ruined! It’s all ruined!
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Daniel Apai @danielapai.bsky.social · 13/02/2026
What if Earth-sized HZ worlds don’t have exactly Earth-like climate feedbacks? Climate Chaos, Snowballs, run-aways - but also many temperate yet not-Earth-like worlds! Congrats to Chaucer Langbert on this cool study! arxiv.org/abs/2602.10369 @uarizonalpl.bsky.social @stewardobservatory.bsky.social
arxiv.org
Not Earth-like Yet Temperate? More Generic Climate Feedback Configurations Still Allow Temperate Climates in Habitable Zone Exo-Earth Candidates
Earth's climate is influenced by over a dozen feedbacks, but only three dominate its long-term climate behavior. Models of the exoplanet habitable zone (HZ) assume that this is similar for other Earth...
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Dr. Emily Gilbert @emdwarf.bsky.social · 10/01/2026
It's happening!!! Pandora is going to space in just over 16 hours (if all goes well). Pandora is going to help us study exoplanet atmospheres, even when their host stars are misbehaving. I am headed up to Vandenberg to watch the launch shortly, and will make a thread about the mission/launch here!
Pandora spacecraft in front of an exoplanet
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Emily Hunt @emily.space · 19/12/2025
Ever wondered how many bins to choose when making a histogram of data? The answer is that you shouldn't choose a number of bins yourself! ☄️ #astrocode Here's a little notebook explaining how to make less biased histograms:
gist.github.com
Making histograms is a common way to estimate the true density distribution of a sample. But how can we choose the number of histogram bins? And if we get fancy and use kernel density estimation (KDE)...
Making histograms is a common way to estimate the true density distribution of a sample. But how can we choose the number of histogram bins? And if we get fancy and use kernel density estimation (K...
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Dennis Just 🌵 @sciencepolice.bsky.social · 18/12/2025
I'm very happy I woke up at 4am this morning to catch 3I/ATLAS right before its closest approach to Earth (today!) This interstellar visitor is traveling over 60 km/s ☄️ At 269 million km (1.8 AU), I took a series of 2.5 min exposures with my Seestar 🔭
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Bibiana Prinoth @handle.invalid · 17/12/2025
The application for the ESO Summer Research Programme 2026 has just opened! It‘s a six week programme in Garching close to Munich where pre-Ph.D students can work on a hands-on project. Working at @eso.org is a fabulous experience, so please help me spread the word ✨ 🔗 eso.org/sci/meetings...
eso.org
ESO - SummerResearch2026
ESO is the European Organisation for Astronomical Research in the Southern Hemisphere. It operates the La Silla Paranal Observatory in Chile and has its headquarters in Garching, near Munich, Germany.
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Seven Machina Rasmussen @toomanyspectra.bsky.social · 13/12/2025
the day is finally here: you can order my debut non-fiction, CLOUDY WITH A CHANCE OF STARSHIPS: HOW THE DRAKE EQUATION REVEALS THE ODDS OF LIFE IN THE COSMOS from B&N!! www.barnesandnoble.com/w/cloudy-wit...

Cloudy with a Chance of Starships takes readers on an irreverent expedition through the marvelous world of astrobiology, using as a guide the most important equation in science since E=mc2. With an irresistible blend of wit, insight, and the latest cutting-edge research, Seven Rasmussen looks at the thrilling possibilities of life in the cosmos through the lens of the Drake equation, a seven-variable mathematical expression that calculates the number of civilizations in our galaxy that humans could potentially contact.

First proposed in 1961 by astrobiologist and SETI scientist Frank Drake, the equation begins with simple and well-known numbers such as the rate of star formation in the Milky Way and the fraction of stars with planetary systems. It then wades into thornier topics such as the number of planets with environments suitable for life, the fraction of suitable planets on which life appears, and the likelihood of intelligent life emerging on a planet and becoming technological. It concludes with the truly unknowable average lifetime of a civilization. While we will never resolve all its variables, the Drake equation offers an invaluable road map to the questions and challenges that lie before us in our quest for alien life.
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Sera Markoff @profsera.bsky.social · 11/12/2025
⭐️✨🔭Please help us get the message out about the 7th annual international ASPIRE program at @api.uva.nl. This summer 2026 school provides astronomy research experience for talented MSc students from countries where opportunities to move into a PhD program are limited. Applications are due 17 Dec! ⭐️✨🔭
aspire.science.uva.nl
ASPIRE
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Gijs D Mulders @gijsmulders.com · 09/12/2025
Equating giant planet occurrence rate of ~20% to the disk fraction, that means a timescale of ~10 Myr for giant planet formation!
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Emily Hunt @emily.space · 09/12/2025
New paper led by Fabian Polnitzcky & with @sratzenboeck.bsky.social + @joaoalves.bsky.social: based on the ages of stars with infrared excess in Sco-Cen, it seems planet-forming disks last around twice as long as previous estimates suggest - giving twice as long for planets to form. 🔭☄️ #exoplanets
Their input source selection in the Sco-Cen region, showing stars with (blue) and without (orange) disks.The fraction of young stars with disks as a function of age, based on three different selection methods. All show that many stars appear to have disks to ages well beyond ~10 million years, with a median lifetime of ~5 million years!
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Gijs D Mulders @gijsmulders.com · 19/11/2025
Question for the #exoplanets crowd: Does any one know where to find an updated version of this plot? I'm looking for the "standard" exoplanet mass vs. semi-major axis plot, but with an overlay of which planets have a spectroscopic measurement of their atmosphere wasp-planets.net/2020/09/29/w...
wasp-planets.net
Which exoplanets do we have atmospheric spectra for?
Here’s an interesting plot created by Zafar Rustamkulov (@exoZafar), a PhD student at Johns Hopkins University. He has added up all the exoplanets for which we have either transmission spectr…
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Ilaria Pascucci @pascucci.bsky.social · 05/11/2025
Enjoyed giving a UofA Origins talk on how protoplanetary disks evolve – featuring new results from ALMA and JWST. The recording is available here 👇 youtu.be/mdgGgnjVbb0 @uarizonalpl.bsky.social @stewardobservatory.bsky.social
youtu.be
Protoplanetary Disk Evolution in the ALMA–JWST Era (Ilaria Pascucci, UArizona/LPL)
YouTube video by Origins Seminars
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Eric Mamajek @ericmamajek.bsky.social · 05/11/2025
Big congrats to Jennifer Burt, Xavier Dumusque, and Sam Halverson on finishing their epic (instant classic) Annual Reviews of Astronomy & Astrophysics article "Precise Radial Velocities"! arxiv.org/abs/2511.01954 contains some great new graphics for talks on #exoplanets #EPRV #DopplerSpectroscopy
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Kevin Hardegree-Ullman @kevinkhu.bsky.social · 16/10/2025
The NASA #Exoplanet Archive now has Gaia DR3 IDs! This should hopefully make your work and planning observations easier! exoplanetarchive.ipac.caltech.edu
An image of the Gaia spacecraft logo in red with text above it that says Gaia DR3 IDs.
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Tim Lichtenberg @timlichtenberg.bsky.social · 13/10/2025
w/ Oli Shorttle, @johannateske.bsky.social & Eliza Kempton we reviewed our current understanding and prospects for peaking on the inside of small #exoplanets in "Constraining exoplanet interiors using observations of their atmospheres": www.science.org/stoken/autho... & arxiv.org/abs/2510.08844 🔭🧪⚒️☄️
Illustration of predicted interior structures of sub-Neptune exoplanets. Observed density and atmospheric constraints are interpreted in three scenarios, each with a gaseous envelope. Water worlds have a small metal core, rocky mantle, high-pressure ice layer, and possible liquid water ocean. Gas dwarfs have a larger metal core and a magma ocean. Global supercritical regimes have no clear boundaries between layers. Image credit: Mark A. Garlick.
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Gijs D Mulders @gijsmulders.com · 08/10/2025
How do giant planets influence the type of #exoplanets that form in the habitable zone? A thread 1/🧵
Many Exoplanets
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András Gáspár @andrasgaspar.bsky.social · 29/09/2025
Our paper on the JWST/MIRI observations of the epsilon Eridani system, led by Dr. Schuyler Wolff, were published today! This is the last of the Archetypical Disks in our MIRI Survey, after Fomalhaut and Vega. Just like for those disks, our MIRI images reveal an extended inner asteroid disk!
Four color image of the eps Eri debris disk.
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Jonathan Fortney @jjfplanet.bsky.social · 26/09/2025
I'm really excited about this one! It's fantastic working with Dr. Yayaati Chachan: arxiv.org/abs/2509.20428 "Revising the Giant Planet Mass-Metallicity Relation: Deciphering the Formation Sequence of Giant Planets" Lots of great nuggets her, including that even super-Jupiters are very metal-rich.
arxiv.org
Revising the Giant Planet Mass-Metallicity Relation: Deciphering the Formation Sequence of Giant Planets
The rate at which giant planets accumulate solids and gas is a critical component of planet formation models, yet it is extremely challenging to predict from first principles. Characterizing the heavy...
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Dr. Jessie Christiansen @aussiastronomer.bsky.social · 17/09/2025
Sometimes 2025 just feels like a lot, and you need an excuse to celebrate your fabulous team (and the whole exoplanet community!) reaching a new milestone… Happy 6,000 Confirmed Exoplanets Day, everybody!!!! (You may recognize the narrator of the video at the link! 🫣) www.nasa.gov/universe/exo...
A close-up photo of a box of cupcakes with gold candles spelling out ‘6000’. A group of smiling people - scientists, engineers, data analysts and writers - standing behind a table of goodies.
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Adam Rains @spectraltypos.bsky.social · 17/09/2025
Paper day! You're doing ground-based high-resolution exoplanet transmission spectroscopy and want to analyse the planet—not the star or Earth's atmosphere. Is there a way to disentangle your spectrum *without* destroying the planet signal? arxiv.org/abs/2509.12737 🧵⬇️ 🔭 #exoplanets #astromethods
arxiv.org
TSD: An inverse problem approach for recovering the exoplanetary atmosphere transmission spectrum from high-resolution spectroscopy
Our ability to observe, detect, and characterize exoplanetary atmospheres has grown by leaps and bounds over the last 20 years, aided largely by developments in astronomical instrumentation; improveme...
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Emily Hunt @emily.space · 08/09/2025
For the last two years, I've been paying for the Astronomy feeds hosting myself. It has been a privilege to grow our community here, but I also shouldn't keep doing it for free 😅 That's why I'm delighted to announce that we now have a donations page on Open Collective! 🔭☄️ #astrophotography
opencollective.com
The Astrosky Ecosystem - Open Collective
We're building an open-source ecosystem of social media tools for the space science & astronomy communities.
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Melina Thévenot🏳️‍⚧️ @melina-iras07572.bsky.social · 03/09/2025
Seems like Ayumu Shoshi et al. did take a high-resolution ALMA image of the disk around IRAS 04125+2902. arxiv.org/abs/2509.01896 This system also has the youngest transiting #exoplanet, discovered in November 2024 with TESS. Disk, planet orbit and outer stellar companion orbit are all misaligned.
Figure 1 of the pre-print. Three images of the same dust ring using different methods.
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Matthew Kenworthy @mattkenworthy.bsky.social · 26/08/2025
Proud supervisor moment: #LeidenObservatory graduate student Richelle van Capelleveen led one of two papers on our discovery of WISPIT 2b, a 5 Jupiter mass exoplanet clearing a path in a circumstellar disk. Laird Close and his team saw it in H-alpha, indicating gas accretion #astrodon 🔭 🧪
A series of concentric black and white ovals against a black background, with a dim red dot in the lower left of one of the paths of a black ring. The ovals are dust rings around a young star, and the red dot is a 5 Jupiter mass exoplanet called WISPIT 2b.
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Gabe Weible @gabeweible.bsky.social · 26/08/2025
New protoplanet(s?) alert! I'm happy to share this LBTI image of WISPIT 2 from our team's paper led by Laird Close. Planet b was discovered at Hα with MagAO-X following the SPHERE disk discovery (R. van Capelleveen +), and CC1 might be a candidate 2nd (enshrouded?) protoplanet #exoplanets ☄️🔭🧪
Annotated false-color image of the WISPIT 2 system as seen in infrared light by the Large Binocular Telescope Interferometer (LBTI). The host star has been subtracted from the center of the image, with the inner lambda/D radius masked. Two bright circumstellar point sources are seen: CC1 - a superjovian protoplanet candidate(?) in the inner disk cavity, and b - a superjovian protoplanet in a disk gap further out. Three protoplanetary disk rings are also visible despite self subtraction from the KLIP-ADI algorithm (Rings 1, 2, and 3 in the companion paper by R. van Capelleveen et al.)
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Gijs D Mulders @gijsmulders.com · 20/08/2025
#achievement for the day (please don't send me any more email)
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Jonathan Fortney @jjfplanet.bsky.social · 19/08/2025
I think that mass-loss is important for sub-Neptunes and the "radius valley," but I do not think that "core-powered" escape is significant. We find that "Boil-off," right when the disk dissipates, and then XUV driven escape, are major influences. ui.adsabs.harvard.edu/abs/2024ApJ....
ui.adsabs.harvard.edu
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Gijs D Mulders @gijsmulders.com · 19/08/2025
Question for the radial velocity #exoplanets experts: Is there an animation that shows two spectra being shifted with respect to each other and the corresponding values of the cross correlation function changing? I think I’ve seen one in a talk but can’t find a nice animation online
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Dr Ryan MacDonald @distantworlds.space · 13/08/2025
We looked for an atmosphere on TRAPPIST-1d using JWST, but we didn't see any atmospheric absorption. So TRAPPIST-1d is quite different from Earth, despite lying just inside the habitable zone. The planet is either: ➡️ A bare rock. ➡️ Very cloudy. ➡️ Has a thin, Mars-like atmosphere. #Exoplanets 🔭
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Kevin Hardegree-Ullman @kevinkhu.bsky.social · 11/08/2025
Kepler mission: smaller stars have more short-period, small #exoplanets. Theory: the smallest stars won’t have enough disk material to make small planets so there must be a turnover. Kepler+K2: We have found a turnover! Check out our newest Scaling K2 paper: arxiv.org/abs/2508.05734 🧵 1/9 🔭🧪☄️
arxiv.org
Scaling K2 VIII: Short-Period Sub-Neptune Occurrence Rates Peak Around Early-Type M Dwarfs
We uniformly combined data from the NASA Kepler and K2 missions to compute planet occurrence rates across the entire FGK and M dwarf stellar range. The K2 mission, driven by targets selected by guest ...
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Steve Desch @deschscoveries.bsky.social · 08/08/2025
I have a complaint about Avi Loeb's latest work and I want to speak to management. medium.com/@steve.desch...
medium.com
This is not the quality of pseudoscience infotainment to which I have grown accustomed
Teasing the public with fraudulent or self-deluded promises of aliens used to mean something. It took work. It meant slapping together…
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Dr. Jessie Christiansen @aussiastronomer.bsky.social · 06/08/2025
Images from Palomar at 2 different infrared wavelengths last night - one that Saturn's methane atmosphere absorbs, and one the it reflects! (The faint point source is the moon, Tethys!) Taken by David Ciardi, Catherine Clark, @lowbacca.bsky.social and Miranda Felsmann; animated by me (and ezgif!)
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Dr. Jessie Christiansen @aussiastronomer.bsky.social · 07/08/2025
I really like this graphical summary of the architectures of planetary systems from @sidereuskinch.bsky.social‬'s talk at From Transits to Trends!
A figure with four quadrants:
High stellar obliquity/low mutual inclination: tilted disk
Low stellar obliquity/low mutual inclination: flat system
High stellar obliquity/high mutual inclination: high-e migration
Low stellar obliquity/high mutual inclination: broken disk
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David Kipping @davidkipping.bsky.social · 26/07/2025
New paper! Allow me to introduce TARS = Torqued Accelerator using Radiation from the Sun. TARS (yes inspired by Interstellar!) is a rotating light sail that's capable of launching chip sats into interstellar space using only radiation from the Sun, so let's dive into how it works.
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Dr. Jessie Christiansen @aussiastronomer.bsky.social · 26/07/2025
The main takeaway of my talk, in the style of the ‘Behold my field of fucks and see that it is barren’ embroidery:
A colourful slide with pastel rainbows and clouds and stars and three big black words: NO MANUAL VETTING.
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Harshitha M Parashivamurthy @harshithamysore.bsky.social · 23/07/2025
What does the radius valley tell about the planet formation scenario around low mass stars? And how does it connect it with water worlds? To know more, come visit my poster #37 at SSW2025. #sagan2025 #exoplanets
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