Linn Boldt-Christmas
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nplinnspace.bsky.social
Linn Boldt-Christmas
@nplinnspace.bsky.social
3.6K followers 400 following 270 posts
🇸🇪 Exoplanet atmospheres + chemistry + formation at Uppsala University 🪐🔭 Also into astrobiology, policy, climate, equality/EDI, and scicomm ✨ (she/her) – linnboldtchristmas.wordpress.com
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nplinnspace.bsky.social
Linn Boldt-Christmas @nplinnspace.bsky.social · Aug 27
Do you love WASP-107 b? Do you love making use of *both* ground VLT + space JWST obs to detect molecules in a "warm" (Teq<800K) #exoplanet in transmission, even in a crazy confusing cloudy atmosphere?!

🚨 It's PAPER* DAY! Which means #scicomm thread!

🧵⬇️🔭🪐🧪

*pre-print!

arxiv.org/abs/2508.18964
VLT/CRIRES+ observations of warm Neptune WASP-107 b: Molecular detections and challenges in ground-based transmission spectroscopy of cooler and cloudy exoplanets
Atmospheres of transiting exoplanets can be studied spectroscopically using space-based or ground-based observations. Each has its own strengths and weaknesses, so there are benefits to both approache...
arxiv.org
nplinnspace.bsky.social
Once again, humanity has been fooled by the classic prank ”this is surely a fixed value that we can use as a unit of measurement forever” on us by the natural world around us — first a foot, then a stone, now the radius of Jupiter. When will we learn?! 🧪🔭
February 13, 2026 at 9:36 AM
Reposted by Linn Boldt-Christmas
chrislintott.bsky.social
Astronomers: highly recommend this thoughtful opinion piece by @hogg.bsky.social on how to think about our field in light of the development of large language models. whether you agree with him or not it’s vital to discuss the principles behind our science. 🔭 arxiv.org/abs/2602.10181
Why do we do astrophysics?
At time of writing, large language models (LLMs) are beginning to obtain the ability to design, execute, write up, and referee scientific projects on the data-science side of astrophysics. What implic...
arxiv.org
February 12, 2026 at 2:00 PM
Reposted by Linn Boldt-Christmas
physicsworld.bsky.social
How do you track space debris as it makes its fiery descent through the Earth’s atmosphere? Geophysicists have come up with an intriguing new answer: use a network of earthquake sensors to follow the shock waves the debris creates. 🧪⚛️🔭 physicsworld.com/a/earthquake...
Earthquake-sensing network detects space debris as it falls to Earth – Physics World
Proof-of-principle experiment resolved the shock waves produced by the Shenzhou-15 module when it re-entered the atmosphere
physicsworld.com
February 11, 2026 at 2:31 PM
nplinnspace.bsky.social
🔭🧪 Mark your calendars & pre-order this incredibly exciting new book all about astrobiology (!!) and #exoplanets and much much more by the amazingly talented @toomanyspectra.bsky.social! I CANNOT wait to enjoy this first for myself and then gift it to everyone I know 🤩
toomanyspectra.bsky.social seven rasmussen — STARSHIPS out 8/4/26 @toomanyspectra.bsky.social · 1d
can’t believe it’s finally my turn to do this but:

COVER REVEAL!!

here is the long-awaited cover for CLOUDY WITH A CHANCE OF STARSHIPS by the incredibly talented Kamille Rodriguez

pre-order here: www.barnesandnoble.com/w/cloudy-wit...
black background white text and white frame, around the edges are colorful things like galaxies, planets, leaves, and sea creatures
February 11, 2026 at 9:03 PM
Reposted by Linn Boldt-Christmas
toomanyspectra.bsky.social
can’t believe it’s finally my turn to do this but:

COVER REVEAL!!

here is the long-awaited cover for CLOUDY WITH A CHANCE OF STARSHIPS by the incredibly talented Kamille Rodriguez

pre-order here: www.barnesandnoble.com/w/cloudy-wit...
black background white text and white frame, around the edges are colorful things like galaxies, planets, leaves, and sea creatures
February 11, 2026 at 6:37 PM
Reposted by Linn Boldt-Christmas
andrewjonesspace.bsky.social
Close-up of liftoff.
February 11, 2026 at 12:35 PM
Reposted by Linn Boldt-Christmas
transport.esa.int
Women aren’t just reaching for the stars, they’re engineering the rockets that get us there. On International Day of Women and Girls in Science, these are some of the faces of @esa.int Space Transportation.
February 11, 2026 at 8:05 AM
Reposted by Linn Boldt-Christmas
sarahkendrew.bsky.social
love it 🔭
mattkenworthy.bsky.social Matthew Kenworthy @mattkenworthy.bsky.social · 3d
At the last Spirit of Lyot conference we were handing out stickers with this meme:
a meme with the guy awarded a medal and celebrating wildly, then pulling out to see he's third on the podium. He's direct imaging, with transit being first and radial velocity being second.
February 10, 2026 at 4:49 PM
Reposted by Linn Boldt-Christmas
asuarezmascareno.com
With the help of some colleages, I have drafted a letter for the director of science of ESO about the situation of the latest time llocstion in ESPRESSO. I share It here in case someone supports its content and have comments or want to co-sign it. docs.google.com/document/d/1... 🔭#exoplanets
Letter of concern to ESO
*To co-sign the letter, please add a comment with your name and institution here or at the end. Concern regarding scientific balance in ESPRESSO allocations: the RV detection science case *In coordin...
docs.google.com
February 10, 2026 at 6:33 PM
Reposted by Linn Boldt-Christmas
asuarezmascareno.com
A better version of the plot with the biggest missing pieces. I truly cannot wrap my head around all this 🔭#exoplanets
February 5, 2026 at 3:28 PM
Reposted by Linn Boldt-Christmas
emily.space
🔭☄️ #exoplanets
benjaminpope.bsky.social Benjamin Pope @benjaminpope.bsky.social · 3d
Very happy to advertise a Postdoctoral Research Associate in Exoplanet Science position with me and Christian Schwab at Macquarie University in Sydney.

We'll be working on applying machine learning & differentiable physics models to extremely precise radial velocity surveys.
Postdoctoral Research Associate in Exoplanet Science
PRIMARY DETAIL - Salary Package: $109,272 - $117,108 (HEW Level A.6-A.8) - plus 17% employer's superannuation contribution and annual leave loading. - Full time, 3 year fixed-term role - Macquarie Uni...
mq.wd3.myworkdayjobs.com
February 10, 2026 at 5:45 AM
Reposted by Linn Boldt-Christmas
science.esa.int
The 2026 ESA Graduate Trainee positions are waiting for your applications!

Step into a unique role where you’ll contribute to inspiring space missions and work alongside leading professionals from across Europe.

Discover the available positions 👉 jobs.esa.int

#ESArecruits 🔭 🧪
Ad for the ESA Graduate Trainee Programme 2026. A person is standing in the middle of a road looking at a meteor in the sky. The person has a backpack and holds a mobile phone in the hand. The landscape looks desert-like. The Milky Way band is visible across the sky. An ESA logo is placed on the upper right-hand corner, whereas on the lower right-hand corner the name of the agency is written: European Space Agency.
February 9, 2026 at 1:00 PM
Reposted by Linn Boldt-Christmas
reggiek.bsky.social
I have student projects available for all levels!

Interested in simulating star formation and interactions with the star-forming cloud? Have a look at these!

I work with students to align the project to their skills, interests, and academic level. 🔭✨#Astronomy

rajikalk.github.io/html_pages/s...
Student projects - Kuruwita
rajikalk.github.io
February 9, 2026 at 7:58 AM
Reposted by Linn Boldt-Christmas
chanda.blacksky.app
Big opportunity to work with a great cosmologist! ⚛️🧪
tukohbin.bsky.social Eugene Lim @tukohbin.bsky.social · 13d
I am looking to recruit a PhD student for the October 26 entry. It will be funded by STFC. Project(s) will be some combination of early universe cosmology, numerical relativity and strong gravity, and dynamical compactification of extra dimensions!

Apply through this portal

apply.kcl.ac.uk
Login - King's Apply
We apologise for any inconvenience this may cause and thank you for your patience whilst this essential maintenance is underway.
apply.kcl.ac.uk
February 9, 2026 at 12:28 PM
Reposted by Linn Boldt-Christmas
astroprofhoff.bsky.social
Super interesting 🧵 on darkness and how we conceive of it (both legally and culturally). 🔭🧪
joshuasokol.bsky.social Joshua Sokol @joshuasokol.bsky.social · 8d
There’s an interesting lawsuit out of Connecticut I’ve been following that rests on the question of whether darkness — yes, darkness, the primordial Erebus himself— is a natural resource. Here’s why that’s potentially a big deal.
February 5, 2026 at 4:50 PM
Reposted by Linn Boldt-Christmas
rockyworlds.bsky.social
📢 Less than 1 hour left until this talk begins!

14:00 UTC = 15:00 CET = 09:00 EST = 06:00 PST = 23:00 JST

If you haven't signed up to our mailing list to access the Zoom-link, you can also watch it live on our YouTube channel 🔭☄️🧪 Livestream: www.youtube.com/watch?v=6t9B...
rockyworlds.bsky.social Rocky Worlds Meetings @rockyworlds.bsky.social · 9d
Would you dare to stand up against the wrath of a star?! Brave little Venus does... and still has an atmosphere! ☀️💨🪐🧲

Next #RockyWorldsDiscussion on Thu 5 Feb @ 14:00 UTC features Moa Persson on "Venus: Defying the Solar Wind Without a Magnetic Shield"

More: www.rockyworlds.org/event-detail...

🧪🔭
An image of the speaker, Moa Persson. She is smiling and looking into the camera over her shoulder. She has light brown hair down to her shoulders, and is wearing a blue shirt with glasses. She is holding a hammer as she is completing her "thesis nailing", a tradition at many Swedish universities for finishing PhD students. An artist illustration of Venus, and its atmosphere eroding against solar winds. Credit: ESA (Animation by C. Carreau) Longer caption attached to the image on ESAs website, posted November 2007: "Mars, Earth and Venus are immersed in a flow of plasma, an ionised and highly variable gas originating from the Sun, called the solar wind. While Earth has a planetary magnetic field, which can deviate the flow of solar wind, Venus (and Mars) don’t. Gases in the upper atmospheres of these planets are ionised and can thus interact with the solar wind. Venus is as large as Earth and it is difficult for its atmosphere to escape due to the planet’s gravity. The solar wind is the best source of energy to accelerate the upper atmosphere’s charged particles, giving them enough energy to escape. This is why Venus loses its atmosphere due to interaction with the solar wind. To understand this phenomenon, the key questions that the instruments studying plasma on Venus Express must answer are: what and how much of the atmosphere is lost, and where is it lost? Right now, solar activity is at its minimum in the 11-year cycle, making the solar wind weaker than average. The critical question now is how solar wind interacts with Venus when solar activity is low."
February 5, 2026 at 1:12 PM
Reposted by Linn Boldt-Christmas
rasjournals.bsky.social
Published in #MNRAS: "Solar carbon abundance from 3D non-LTE modelling of the diagnostic lines of the CH molecule", Hoppe et al. This is Fig. 2: please visit academic.oup.com/mnras/articl... to read the paper. @royalastrosoc.bsky.social @academic.oup.com
Comparison of synthetic and observed solar G-band intensity at wavelength 4306.8 ± 15 Å at different positions across the solar disc (different rows). The synthetic G band has been convolved with the SST photometric filter transmission function (M. Carlsson et al. 2004). The G-band observations were acquired with the Swedish 1-m Solar Telescope (SST; G. B. Scharmer et al. 2003a) on La Palma in 2003–2004 (T. E. Berger et al. 2004; Y. Lin et al. 2005; Van Der Voort private communication). For more detailed information on these observations we refer the reader to https://www.isf.astro.su.se/data1/gallery/. We show the disc centre µ = 1 at the bottom and two angles approaching the limb above. The black and white levels of the observations were adjusted to account for the different processing of the individual measurements.
February 5, 2026 at 9:40 AM
Reposted by Linn Boldt-Christmas
itzimex.bsky.social
Postdoc position in my team at CAB CSIC-INTA, Spain. We are hiring in the Milgatz project 🔭 to do TolTEC science on dusty star forming galaxies eas.unige.ch/jobs.jsp?typ...
A description to be found also here (please make sure to use http instead of https): www.itziararetxaga.net/2025/06/atra...
February 5, 2026 at 8:37 AM
Reposted by Linn Boldt-Christmas
rockyworlds.bsky.social
Would you dare to stand up against the wrath of a star?! Brave little Venus does... and still has an atmosphere! ☀️💨🪐🧲

Next #RockyWorldsDiscussion on Thu 5 Feb @ 14:00 UTC features Moa Persson on "Venus: Defying the Solar Wind Without a Magnetic Shield"

More: www.rockyworlds.org/event-detail...

🧪🔭
An image of the speaker, Moa Persson. She is smiling and looking into the camera over her shoulder. She has light brown hair down to her shoulders, and is wearing a blue shirt with glasses. She is holding a hammer as she is completing her "thesis nailing", a tradition at many Swedish universities for finishing PhD students. An artist illustration of Venus, and its atmosphere eroding against solar winds. Credit: ESA (Animation by C. Carreau) Longer caption attached to the image on ESAs website, posted November 2007: "Mars, Earth and Venus are immersed in a flow of plasma, an ionised and highly variable gas originating from the Sun, called the solar wind. While Earth has a planetary magnetic field, which can deviate the flow of solar wind, Venus (and Mars) don’t. Gases in the upper atmospheres of these planets are ionised and can thus interact with the solar wind. Venus is as large as Earth and it is difficult for its atmosphere to escape due to the planet’s gravity. The solar wind is the best source of energy to accelerate the upper atmosphere’s charged particles, giving them enough energy to escape. This is why Venus loses its atmosphere due to interaction with the solar wind. To understand this phenomenon, the key questions that the instruments studying plasma on Venus Express must answer are: what and how much of the atmosphere is lost, and where is it lost? Right now, solar activity is at its minimum in the 11-year cycle, making the solar wind weaker than average. The critical question now is how solar wind interacts with Venus when solar activity is low."
February 3, 2026 at 6:22 PM
Reposted by Linn Boldt-Christmas
rockyworlds.bsky.social
A HUGE thank you to all attendees of the #RockyWorlds4 conference in Groningen! We had an absolutely incredible time talking astronomy, geoscience, biology, and so much more 🚀🌋🌱🪐✨🔭🧪

Catch the recorded talks on www.youtube.com/@rockyworlds

And see you in Berlin in 2028! berlin2028.rockyworlds.org
A group photo showing a huge crowd, namely the attendees of the Rocky Worlds 4 conference! They are stood up and around a big staircase and walkway inside a modern building; smiling; and throwing their hands up.
February 3, 2026 at 12:52 PM
Reposted by Linn Boldt-Christmas
dutchspace.bsky.social
So they will do another WDR after fixing the issues seen and move the launch the March

Full overview here:
www.nasa.gov/blogs/missio...

#ArtemisII
NASA Conducts Artemis II Fuel Test, Eyes March for Launch Opportunity   - NASA
NASA concluded a wet dress rehearsal for the agency’s Artemis II test flight early Tuesday morning, successfully loading cryogenic propellant into the SLS
www.nasa.gov
February 3, 2026 at 8:48 AM
Reposted by Linn Boldt-Christmas
dutchspace.bsky.social
If you want to following along with the Artemis II WDR, i've created this little tool that displays the WDR timeline and live-streams, try it out here x37b.nl/artemis/

Note: it is total crappy code, things may break and I might update it "live" so you have been warned :)

#ArtemisII
February 1, 2026 at 10:19 AM
Reposted by Linn Boldt-Christmas
astrojonny.bsky.social
Bump on this - looking for an expert specifically on orbital data centres available in the next few hours. If that's you let me know!
astrojonny.bsky.social Jonathan O'Callaghan @astrojonny.bsky.social · 11d
Hey space people, I’m looking for experts to comment and provide some insight on SpaceX’s application for a million satellites.

If that’s you drop me a line. Thanks!

jdaoca[at]gmail[dot]com
February 3, 2026 at 1:58 AM
Reposted by Linn Boldt-Christmas
eso.org
Exclusive view into the heart of the ELT! 👀

This image captures the interior of our ELT, under construction in Chile's Atacama Desert. The main structure shown here will host the ELT’s five mirrors.

Read more: https://www.eso.org/public/images/potw2605a/

🔭 🧪
📷 ESO/J. C. Muñoz-Mateos
This image shows the interior of the Extremely Large Telescope's (ELT) dome. The telescope structure, supported by struts, takes up most of the image in the centre, with some cranes around working. The gigantic doors of the dome are open, allowing sunlight to shine through.
February 2, 2026 at 8:01 AM
Reposted by Linn Boldt-Christmas
benjaminpope.bsky.social
We're recruiting international MRes and PhD students at Macquarie across stars & planets, galaxies, and instrumentation.

Sign up here by February 8!

In particular, I'm recruiting for exoplanet projects generally and have funding for RVs in particular. Submit your expressions of interest here!
PhD and Masters of Research Positions in Astronomy and Astrophysics | American Astronomical Society
Macquarie University is seeking outstanding candidates for PhD and Masters of Research scholarships commencing July 2026.
aas.org
January 30, 2026 at 7:51 AM