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Baptiste Journaux

@bjour.bsky.social
444 followers 103 following 29 posts

Assistant Prof in Planetary mineral physics at UW Earth and Space Science department| icy ocean worlds | ice(s) physic | free diving | www.SeaFreeze.org

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Baptiste Journaux @bjour.bsky.social · 08/04/2026
2026 space odyssey
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Baptiste Journaux @bjour.bsky.social · 04/04/2026
Et Vénus (en bas à droite) ;)
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Baptiste Journaux @bjour.bsky.social · 03/04/2026
Largest group picture ever taken by someone. Also Venus in the upper left
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SkyMapper @skymapper.bsky.social · 12/03/2026
Catch SkyMapper CEO and @setiinstitute.bsky.social Director of #citizenscience @allplanets.bsky.social at “Eyes on Earth & Space: Breaking Through Complex Problems,” hosted by the French-American Chamber of Commerce Pacific Northwest in Seattle on Mar 16.
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Baptiste Journaux @bjour.bsky.social · 19/12/2025
Very exciting new result we were able to help a bit with. Among many other things it is possibly the first geophysical detection of high pressure ices, and the first real world observation of the cenotectic.
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Baptiste Journaux @bjour.bsky.social · 25/06/2025
What a year! Very grateful for the recognition of all the hard work accomplished by our team at UW and abroad over the last few years by the IAPWS. More exciting things to come very soon!
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Alexander Berne @enceladusdude.bsky.social · 03/06/2025
Imaging Ganyemede’s Interior using Tides? 🛰️ Here, we propose measuring Ganymede’s response to tidal intercations with Jupiter using JUICE gravity data. In doing so, we can (maybe) tease out shell thickness variations, which would indicate a convecting ocean. Read more at: doi.org/10.1029/2025...
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Alexander Berne @enceladusdude.bsky.social · 15/05/2025
The Moon's nearside mantle is a giant volcano? 🌋 In this study, we infer a 100-200 C temperature anomaly in the Moon's nearside mantle. This anomaly suggests that geologic activity which formed the mare 3-4 billion years ago is still active today. nature.com/articles/s41...
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Randall Munroe @xkcd.com · 14/03/2025
Planet Definitions xkcd.com/3063
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UW College of the Environment @uwenvironment.bsky.social · 12/03/2025
@uwess.bsky.social's @bjour.bsky.social is uncovering how the "cenotectic" could reshape our search for life on icy moons. Journaux and @tamu.bsky.social's Matt Powell-Palm dive into extreme environments, and what they reveal about more than just planetary science. ess.uw.edu/2025/03/unlo...
ess.uw.edu
Unlocking the secrets of icy moons: how the ‘cenotectic’ could revolutionize the search for life beyond Eartharrowarrowarrowarrowarrowarrow
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UW Earth & Space Sciences @uwess.bsky.social · 11/03/2025
🚀 As NASA’s Europa Clipper embarks on its 5.5-year journey to Europa, a new study in Nature Communications led by UW planetary scientist @bjour.bsky.social reveals groundbreaking research that could revolutionize the search for habitability in our solar system and beyond. Read the full story👇
ess.uw.edu
Unlocking the secrets of icy moons: how the ‘cenotectic’ could revolutionize the search for life beyond Eartharrowarrowarrowarrowarrowarrow
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Michael Wong @miquai.bsky.social · 06/03/2025
Undergrads I mentor are seeking PhD programs. Grad students I work with are looking for postdoc positions. Postdocs like me are hoping to become faculty. Without federal support, many of these dreams will evaporate. It's alarming and depressing to watch so many doors close around us.
washingtonpost.com
Hiring freezes, fewer grad students: Funding uncertainty hits colleges
Universities are tightening their belts and reducing graduate student enrollments to steel themselves for potential Trump administration funding cuts.
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Hank Green @hankgreen.bsky.social · 02/03/2025
We are experiencing an assault on science unparalleled by anything I’ve seen in my life. It’s not one issue or another anymore, the entire institution is under attack by the most powerful individuals in the country. This Friday, where will you be? standupforscience2025.org
standupforscience2025.org
STAND UP FOR SCIENCE
March 7, 2025. Washington DC and nationwide. Because science is for everyone.
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Ned Wright @mapping3k.bsky.social · 24/02/2025
For anyone disappointed by 2024 YR4's disappearing threat please remember that even at its peak of ~3% chance it still had a negative rating on the Palermo scale. 1/
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Celeste Labedz @celestelabedz.bsky.social · 19/02/2025
Anyway, "GenAI can inhibit critical engagement with work and can potentially lead to long-term overreliance on the tool and diminished skill for independent problem-solving" bsky.app/profile/keta...
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Baptiste Journaux @bjour.bsky.social · 19/02/2025
To understand why the probability of impact was increasing in recent days and is likely to drop to 0 in the next few days/weeks it is important to realize that it was mostly driven by the size of the 1sigma uncertainty which diminished with better observations while earth was still inside it.
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Baptiste Journaux @bjour.bsky.social · 19/02/2025
Mieux que ça, on a pour la première fois une estimation avec la terre significativement hors du 1sigma d’incertitude du close approach : bsky.app/profile/mapp...
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Mark Panning @markpanning.seismology.space · 18/02/2025
New results from several of my colleagues in the Planetary Interiors and Geophysics group at JPL (which we lovingly refer to as PIGS).
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Andrew J. Steinmetz @ajsteinmetz.com · 12/02/2025
This video by @hankgreen.bsky.social covers why the Galilean moons are so amazing. I love Pluto too, but #Io, #Europa, #Ganymede and #Callisto are top tier Solar System objects. 🧪🔭 #Astronomy #Science #Geology #PlanetaryScience #Space Shoutout to the Europa Clipper: science.nasa.gov/mission/euro...
youtu.be
You're Wrong About Pluto
YouTube video by hankschannel
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Baptiste Journaux @bjour.bsky.social · 01/02/2025
I think it’s a good idea. If we want to make it successful we need to be inclusive and supportive of students and early career joining and getting some kind of benefits from it. This is something that we have worked on at the Cryobiology society with success. Let’s talk, I’ll be at LPSC too.
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Baptiste Journaux @bjour.bsky.social · 31/01/2025
Something important to understand about how science is funded in the US
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UW Earth & Space Sciences @uwess.bsky.social · 29/01/2025
What's it like presenting your research to 25,000 scientists? ESS PhD student Haskelle White-Gianella shares an insider's view on her first AGU conference, what it's like giving a talk to the AGU scientific community, and making connections for her career and future as a planetary scientist! 🪐🌎
youtu.be
UW College of the Environment Grad Student Experience at AGU24
YouTube video by UW College of the Environment
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Randall Munroe @xkcd.com · 18/01/2025
Human Altitude xkcd.com/3039
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Baptiste Journaux @bjour.bsky.social · 15/01/2025
Inkcap is not a bad one, but I wish I was on the Hydnellum peckii server… 🍄‍🟫🦷
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James Tuttle Keane @jtuttlekeane.bsky.social · 10/01/2025
Elena & Topher now have a gofundme: gofund.me/153d27e6. Please help if you can!
gofund.me
Donate to Help the Amador-French Family Rebuild After the Eaton Fire, organized by Danielle Mahrer
Thank you so much to everyone that has already contributed so… Danielle Mahrer needs your support for Help the Amador-French Family Rebuild After the Eaton Fire
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Baptiste Journaux @bjour.bsky.social · 09/01/2025
Elena and Topher are amazing people and old friends from Seattle before they moved to California. If you can help, consider donating, they lost their house yesterday. What an horrible tragedy for so many folks.
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Baptiste Journaux @bjour.bsky.social · 07/01/2025
#2683 ==-- Liquid's last refuge One universal melting Anchors life's promise ==-- See you in the woodlands in March!
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Baptiste Journaux @bjour.bsky.social · 24/12/2024
Amazing effort, let me know if assistance from the ESS department or faculty would be helpful.
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Science X / Phys.org @sciencex.bsky.social · 19/12/2024
The cenotectic concept offers a new framework for assessing liquid stability on icy moons, aiding the search for life in extreme environments like Jupiter's Europa. doi.org/g8wf9t
phys.org
Cenotectic concept redefines search for life on icy worlds
As NASA's Europa Clipper embarks on its historic journey to Jupiter's icy moon, Europa, Dr. Matt Powell-Palm, a faculty member at Texas A&M University's Department of Mechanical Engineering, has unveiled research that could transform our understanding of icy ocean worlds across the solar system.
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Baptiste Journaux @bjour.bsky.social · 19/12/2024
phys.org/news/2024-12...
phys.org
Cenotectic concept redefines search for life on icy worlds
As NASA's Europa Clipper embarks on its historic journey to Jupiter's icy moon, Europa, Dr. Matt Powell-Palm, a faculty member at Texas A&M University's Department of Mechanical Engineering, has u...
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Baptiste Journaux @bjour.bsky.social · 19/12/2024
If you care about how deep oceans in exoplanets are, sure is! More to come on that front from our group in the months to come!
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Baptiste Journaux @bjour.bsky.social · 19/12/2024
Thanks for reading, feel free to contact us for further details!
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Baptiste Journaux @bjour.bsky.social · 19/12/2024
These results are fascinating both for fundamental thermodynamics as we are defining a novel invariant point, but also in Planetary science as they provide an absolute thermodynamic limit of ocean stability and potential habitability of water-rich worlds.
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Baptiste Journaux @bjour.bsky.social · 19/12/2024
We also discuss the novel concept of the "cenotectic ocean", or end-game ocean in water-rich planetary bodies which would be controlled by the concentration and temperature of the cenotectic.
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Baptiste Journaux @bjour.bsky.social · 19/12/2024
This has direct implications for planetary science, that we explore in our publication. First, it provides an absolute thermodynamic limit for icy moons and exoplanets icy crust thickness. For ex Titan cannot have a crust thicker than ~170km, otherwise the entire ocean is frozen:
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Baptiste Journaux @bjour.bsky.social · 19/12/2024
One fascinating result from our measurements is that the cenotectic is almost always at 22K below the 1 atm eutectic point and always around 210MPa where it intersects with the liquidus of ice III or ice II:
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Baptiste Journaux @bjour.bsky.social · 19/12/2024
"The cenotectic is the invariant point occurring at the lowest temperature at which the liquid phase, for any value of concentration, pressure, or other thermodynamic forces acting on the system, remains in stable equilibrium."
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Baptiste Journaux @bjour.bsky.social · 19/12/2024
We define this point as the "Cenotectic", from Greek “κοινός-τῆξῐς”, meaning “universal-melt”. And its general definition (applicable for any systems, not just aqueous systems) is :
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Baptiste Journaux @bjour.bsky.social · 19/12/2024
In the present study we pushed the logic to its extreme. As the eutectic line decreases in T with increasing P, there should be an invariant point at high pressure where this line ends, representing the minimum temperature of stability of liquid at any pressure for that system.
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Baptiste Journaux @bjour.bsky.social · 19/12/2024
For aqueous systems, the temperature evolution of the eutectic is driven by ice Ih negative melting curve with increasing pressure. This is an effect we previously measured using the isochoric method (constant volume) developed at Texas A&M: www.cell.com/cell-reports...
cell.com
On the pressure dependence of salty aqueous eutectics
The eutectic defines the threshold of stability for liquid phases, and high-pressure eutectic data are essential to the modeling of icy worlds. Chang et al. acquire measurements of the pressure dependences of five salty aqueous eutectics, providing both reference data and physical insight into the pressure evolution of the eutectic temperature.
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Baptiste Journaux @bjour.bsky.social · 19/12/2024
The eutectic in particular defines the lowest temperature at which a liquid remains stable in a given system, but is usually only given at constant pressure, usually 1 atm. When pressure changes, this eutectic point becomes an univariant line which T and X coordinates changes too.
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Baptiste Journaux @bjour.bsky.social · 19/12/2024
Thermodynamics is a fascinating field whose most important foundations were laid down in the XIX century. In fact, the earliest binary phase diagram I could find is from Bakhuis Roozeboom in 1900, and already shows the well-known components—such as the liquidus and the eutectic.
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Baptiste Journaux @bjour.bsky.social · 19/12/2024
Incredibly excited to annonce the publication of our new experimental thermodynamic work at high pressures with the definition of a novel thermodynamic invariant point: The Cenotectic (κ) nature.com/articles/s41...
nature.com
On the equilibrium limit of liquid stability in pressurized aqueous systems - Nature Communications
The authors define the cenotectic — the low-temperature stability limit for a liquid under arbitrary thermodynamic conditions — and measure it for several aqueous solutions of relevance to extraterres...
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Baptiste Journaux @bjour.bsky.social · 14/11/2024
How big is Dragonfly? Bigger than most think! (At least me). Was able to hold one of the test blades, and visualize the full scale virtual model. It's close to the size of a mini-van / SUV. What an amazing mission!
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Baptiste Journaux @bjour.bsky.social · 14/11/2024
Absolutely, and it would be quite comfortable to sit on it too. The foam we will be using to isolate is quite squishy and soft (at room temperature at least..)
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Kevin M. Gill @kevinmgill.bsky.social · 31/12/2023
Amazing new images of the moon Io have come down from the Juno spacecraft! This one shows the volcanic moon of Jupiter from only 2,800 kilometers away, which is the closest look we’ve gotten of Io since over 20 years ago. Check out all those volcanoes!!!! NASA/JPL-Caltech/SwRI/MSSS/Kevin M. Gill
Io, a moon of Jupiter, at half phase and sunlit from the left. Tall volcanic mountains and lakes of lava dot the surface.
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