Linn Boldt-Christmas
@nplinnspace.bsky.social
🇸🇪 Exoplanet atmospheres + chemistry + formation at Uppsala University 🪐🔭 Also into astrobiology, policy, climate, equality/EDI, and scicomm ✨ (she/her) – linnboldtchristmas.wordpress.com
Pinned
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
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
🚨 It's PAPER* DAY! Which means #scicomm thread!
🧵⬇️🔭🪐🧪
*pre-print!
arxiv.org/abs/2508.18964
Reposted by Linn Boldt-Christmas
Whoa. The scale of this thing.
That blast wave radiating away from the flare location is impressive. Esp. when you think about the size of the Earth in comparison.
It’s so very near that we live so close to a star and can watch its behaviour and activity.
A star and it’s just right there!
That blast wave radiating away from the flare location is impressive. Esp. when you think about the size of the Earth in comparison.
It’s so very near that we live so close to a star and can watch its behaviour and activity.
A star and it’s just right there!
Here is the X5.1 flare in straight EUV light. We are looking at the 193 Å "gold" filter here. The flare is the bright flash, and immediately, you can see a giant blast wave racing through the Sun's corona, lifting tons of plasma into space as an Earth-directed CME.
November 11, 2025 at 6:52 PM
Whoa. The scale of this thing.
That blast wave radiating away from the flare location is impressive. Esp. when you think about the size of the Earth in comparison.
It’s so very near that we live so close to a star and can watch its behaviour and activity.
A star and it’s just right there!
That blast wave radiating away from the flare location is impressive. Esp. when you think about the size of the Earth in comparison.
It’s so very near that we live so close to a star and can watch its behaviour and activity.
A star and it’s just right there!
Reposted by Linn Boldt-Christmas
It seems like just yesterday that we were in design reviews for GRAVITY the OG version - now there‘s GRAVITY+ with multiple lasers! ESO and Europe/Chile are powerhouses for ground-based astronomy right now. 🔭
1/ Milestone achieved by the VLTI upgrade GRAVITY+: a laser has been installed at each of the previously unequipped VLT Unit Telescopes.
This will dramatically enhance the VLTI observing power.
Discover more with #ChasingStarlight: https://www.youtube.com/watch?v=TzK1B3VU1L8
🔭 🧪
This will dramatically enhance the VLTI observing power.
Discover more with #ChasingStarlight: https://www.youtube.com/watch?v=TzK1B3VU1L8
🔭 🧪
November 10, 2025 at 12:33 PM
It seems like just yesterday that we were in design reviews for GRAVITY the OG version - now there‘s GRAVITY+ with multiple lasers! ESO and Europe/Chile are powerhouses for ground-based astronomy right now. 🔭
Reposted by Linn Boldt-Christmas
Like the sonogram of a planetary system
WOW!
An incredible discovery. The first ever image of a baby exoplanet embedded in the dust rings from which planets are forming around a star. Confirms the developing view of planet formation that we’ve never before seen in action.
🧪🔭
www.universiteitleiden.nl/en/news/2025...
An incredible discovery. The first ever image of a baby exoplanet embedded in the dust rings from which planets are forming around a star. Confirms the developing view of planet formation that we’ve never before seen in action.
🧪🔭
www.universiteitleiden.nl/en/news/2025...
November 8, 2025 at 3:12 PM
Like the sonogram of a planetary system
Reposted by Linn Boldt-Christmas
See below if you're interested in doing a PhD on stars or clusters! Trumpler 14 is an especially awesome cluster in the Carina Nebula, and doing your PhD on it (or star cluster formation more generally) would be tons of fun 😉
The @herts.ac.uk astronomy MSc and PhD applications are open.
I'm offering PhD projects on JWST spectroscopy of young stars in Tr 14 and star-cluster formation.
I'm also offering an MSc project on variability of YSOs.
www.herts.ac.uk/research/cen...
#galactic #stellarastro #astro #Physics
I'm offering PhD projects on JWST spectroscopy of young stars in Tr 14 and star-cluster formation.
I'm also offering an MSc project on variability of YSOs.
www.herts.ac.uk/research/cen...
#galactic #stellarastro #astro #Physics
Solar, Stellar and Time-domain Astrophysics
Star formation and Stellar Evolution PhD Projects.
herts.ac.uk
November 7, 2025 at 8:03 AM
See below if you're interested in doing a PhD on stars or clusters! Trumpler 14 is an especially awesome cluster in the Carina Nebula, and doing your PhD on it (or star cluster formation more generally) would be tons of fun 😉
Reposted by Linn Boldt-Christmas
November 3, 2025 at 1:14 PM
Reposted by Linn Boldt-Christmas
Academics in Assyria in the 7th c BC complain that admin is preventing them from doing research and teaching
November 3, 2025 at 10:04 AM
Academics in Assyria in the 7th c BC complain that admin is preventing them from doing research and teaching
Absolutely floored to have received an award for "open and inclusive" #scicomm and outreach. I'm not usually one to broadcast such things, but I think highlighting this type of work is more important than ever. Please consider getting involved in your own communities! 🔭🧪
www.uu.se/institution/...
www.uu.se/institution/...
October 31, 2025 at 11:18 AM
Absolutely floored to have received an award for "open and inclusive" #scicomm and outreach. I'm not usually one to broadcast such things, but I think highlighting this type of work is more important than ever. Please consider getting involved in your own communities! 🔭🧪
www.uu.se/institution/...
www.uu.se/institution/...
Reposted by Linn Boldt-Christmas
What sets our home planet 🌍 apart from our sister next door? 🌔☁️🔥 On Thu 6 Nov @ 14:00 UTC, Diogo Lourenço will be our next #RockyWorldsDiscussion speaker and tell us how bulk composition & lava flows impact long-term evolution of our neighbour Venus
More: www.rockyworlds.org/event-detail...
🧪🔭☄️
More: www.rockyworlds.org/event-detail...
🧪🔭☄️
October 30, 2025 at 3:07 PM
What sets our home planet 🌍 apart from our sister next door? 🌔☁️🔥 On Thu 6 Nov @ 14:00 UTC, Diogo Lourenço will be our next #RockyWorldsDiscussion speaker and tell us how bulk composition & lava flows impact long-term evolution of our neighbour Venus
More: www.rockyworlds.org/event-detail...
🧪🔭☄️
More: www.rockyworlds.org/event-detail...
🧪🔭☄️
Reposted by Linn Boldt-Christmas
Stunning video of the enormous eye at the center of hurricane Melissa.
Taken by the 53rd Weather Reconnaissance Squadron “Hurricane Hunters” just before they had to abandon their mission.
Melissa is extremely dangerous, the strongest Atlantic hurricane to occur this late in the season.
Taken by the 53rd Weather Reconnaissance Squadron “Hurricane Hunters” just before they had to abandon their mission.
Melissa is extremely dangerous, the strongest Atlantic hurricane to occur this late in the season.
US Air Force provides views from inside Hurricane Melissa
The U.S. Defense Department has released footage of views inside Hurricane Melissa. The military said a U.S.
apnews.com
October 28, 2025 at 1:31 PM
Stunning video of the enormous eye at the center of hurricane Melissa.
Taken by the 53rd Weather Reconnaissance Squadron “Hurricane Hunters” just before they had to abandon their mission.
Melissa is extremely dangerous, the strongest Atlantic hurricane to occur this late in the season.
Taken by the 53rd Weather Reconnaissance Squadron “Hurricane Hunters” just before they had to abandon their mission.
Melissa is extremely dangerous, the strongest Atlantic hurricane to occur this late in the season.
Reposted by Linn Boldt-Christmas
This!!! "you will be intellectually transformed by the process of reckoning with the knowledge these courses are about."
I'd add that the memory of how this transformation *feels* is as important; I still hang onto the visceral satisfaction & pleasure of learning voice leading in AP music theory
I'd add that the memory of how this transformation *feels* is as important; I still hang onto the visceral satisfaction & pleasure of learning voice leading in AP music theory
October 23, 2025 at 4:32 PM
This!!! "you will be intellectually transformed by the process of reckoning with the knowledge these courses are about."
I'd add that the memory of how this transformation *feels* is as important; I still hang onto the visceral satisfaction & pleasure of learning voice leading in AP music theory
I'd add that the memory of how this transformation *feels* is as important; I still hang onto the visceral satisfaction & pleasure of learning voice leading in AP music theory
Reposted by Linn Boldt-Christmas
😎 First glimpses from space!
The new #Copernicus Sentinel-4 mission has delivered its first preliminary images during commissioning.
Sentinel-4’s spectrometer is hosted on @eumetsat.int's MTG-S1 satellite 🧪🌍
@josefaschbacher.esa.int @ec.europa.eu @esaearth.esa.int
The new #Copernicus Sentinel-4 mission has delivered its first preliminary images during commissioning.
Sentinel-4’s spectrometer is hosted on @eumetsat.int's MTG-S1 satellite 🧪🌍
@josefaschbacher.esa.int @ec.europa.eu @esaearth.esa.int
October 21, 2025 at 8:42 AM
😎 First glimpses from space!
The new #Copernicus Sentinel-4 mission has delivered its first preliminary images during commissioning.
Sentinel-4’s spectrometer is hosted on @eumetsat.int's MTG-S1 satellite 🧪🌍
@josefaschbacher.esa.int @ec.europa.eu @esaearth.esa.int
The new #Copernicus Sentinel-4 mission has delivered its first preliminary images during commissioning.
Sentinel-4’s spectrometer is hosted on @eumetsat.int's MTG-S1 satellite 🧪🌍
@josefaschbacher.esa.int @ec.europa.eu @esaearth.esa.int
Reposted by Linn Boldt-Christmas
Seeking PhD candidates that want to do a thesis on exoplanet atmosphere retrieval + machine learning inference. Please apply by 31 October to Dr. Max Dax's and my shared project here: is.mpg.de/news/new-max... . Abstract for the thesis project is attached to this thread below!
New Max Planck Artificial Intelligence Network Starts Call for Applications for its Ph.D. Program
The Max Planck Artificial Intelligence Network is a Ph.D. Program that provides doctoral researchers with fully funded Ph.D. fellowships and a pool of outstanding faculty comprising directors and inde...
is.mpg.de
October 17, 2025 at 12:46 PM
Seeking PhD candidates that want to do a thesis on exoplanet atmosphere retrieval + machine learning inference. Please apply by 31 October to Dr. Max Dax's and my shared project here: is.mpg.de/news/new-max... . Abstract for the thesis project is attached to this thread below!
Reposted by Linn Boldt-Christmas
Reposted by Linn Boldt-Christmas
WHAT A DAY! Thank you to all of you who joined us for a fantastic #ESAOpenDay and to the extraordinary @nl.esa.int scientists and crew for lifting the curtain and getting us a step closer to space!
Space truly ROCKS! 🤘🖖 Let’s do it again next year?
#ESAOpenDay #50YearsOfESA #NLSW25 #SpaceRocks
Space truly ROCKS! 🤘🖖 Let’s do it again next year?
#ESAOpenDay #50YearsOfESA #NLSW25 #SpaceRocks
October 13, 2025 at 8:14 AM
WHAT A DAY! Thank you to all of you who joined us for a fantastic #ESAOpenDay and to the extraordinary @nl.esa.int scientists and crew for lifting the curtain and getting us a step closer to space!
Space truly ROCKS! 🤘🖖 Let’s do it again next year?
#ESAOpenDay #50YearsOfESA #NLSW25 #SpaceRocks
Space truly ROCKS! 🤘🖖 Let’s do it again next year?
#ESAOpenDay #50YearsOfESA #NLSW25 #SpaceRocks
Reposted by Linn Boldt-Christmas
If you study plants, you need this book.
🧵1/n
🧵1/n
The Princeton Field Guide to Mesozoic Plants
A dazzlingly illustrated guide to the plant life of the dinosaur age, from intricate ferns to the most majestic megaflora
press.princeton.edu
October 12, 2025 at 1:58 PM
If you study plants, you need this book.
🧵1/n
🧵1/n
Reposted by Linn Boldt-Christmas
How can we tell what's inside an #exoplanet? @timlichtenberg.bsky.social et al review how a planet's atmosphere interacts with its interior. Atmospheric observations can distinguish between lava worlds, water worlds, temperate surfaces or supercritical interiors. ☄️
www.science.org/doi/10.1126/...
www.science.org/doi/10.1126/...
October 9, 2025 at 6:20 PM
How can we tell what's inside an #exoplanet? @timlichtenberg.bsky.social et al review how a planet's atmosphere interacts with its interior. Atmospheric observations can distinguish between lava worlds, water worlds, temperate surfaces or supercritical interiors. ☄️
www.science.org/doi/10.1126/...
www.science.org/doi/10.1126/...
Reposted by Linn Boldt-Christmas
October 8, 2025 at 9:10 PM
Reposted by Linn Boldt-Christmas
Are you interested in working on astronomical transients/ radio astronomy, all while exploring the beautiful Pacific Northwest on your weekends? I'm hiring a postdoc! Come work for me!
aas.org/jobregister/...
Please get in touch if you have any questions!
🔭🧪🎢
aas.org/jobregister/...
Please get in touch if you have any questions!
🔭🧪🎢
Postdoctoral Positions in Time-Domain Astronomy | American Astronomical Society
The department of Physics and Astronomy at the University of Oregon invites applications for a postdoctoral scholar to work with Prof. Yvette Cendes in the field of time-domain astrophysics. This inc...
aas.org
October 8, 2025 at 6:14 PM
Are you interested in working on astronomical transients/ radio astronomy, all while exploring the beautiful Pacific Northwest on your weekends? I'm hiring a postdoc! Come work for me!
aas.org/jobregister/...
Please get in touch if you have any questions!
🔭🧪🎢
aas.org/jobregister/...
Please get in touch if you have any questions!
🔭🧪🎢
Reposted by Linn Boldt-Christmas
Today's reading begins with Lise Meitner, who co-discovered nuclear fission (she wrote the paper!) and was in general an INCREDIBLE trailblazing scientist.
Except, as a Jew, she had to flee Nazi Germany to Sweden and lost her professorship in Berlin. The men she worked with got the prize instead 🧪🔭
Except, as a Jew, she had to flee Nazi Germany to Sweden and lost her professorship in Berlin. The men she worked with got the prize instead 🧪🔭
Lise Meitner - Wikipedia
en.wikipedia.org
October 7, 2025 at 1:15 PM
Today's reading begins with Lise Meitner, who co-discovered nuclear fission (she wrote the paper!) and was in general an INCREDIBLE trailblazing scientist.
Except, as a Jew, she had to flee Nazi Germany to Sweden and lost her professorship in Berlin. The men she worked with got the prize instead 🧪🔭
Except, as a Jew, she had to flee Nazi Germany to Sweden and lost her professorship in Berlin. The men she worked with got the prize instead 🧪🔭
Reposted by Linn Boldt-Christmas
A sorry record. This is one reason I don’t care for the Nobel prizes. Three others being:
1) promotes a “great man” view of scientific progress, whereas science is best understood and celebrated as a collective, community activity.
🧪
1) promotes a “great man” view of scientific progress, whereas science is best understood and celebrated as a collective, community activity.
🧪
October 7, 2025 at 4:26 PM
A sorry record. This is one reason I don’t care for the Nobel prizes. Three others being:
1) promotes a “great man” view of scientific progress, whereas science is best understood and celebrated as a collective, community activity.
🧪
1) promotes a “great man” view of scientific progress, whereas science is best understood and celebrated as a collective, community activity.
🧪
Reposted by Linn Boldt-Christmas
There is still some hopeful news out there! Of course we need coal to go down... not just stay flat (but flat is better than rising...).
NEW: GLOBAL RENEWABLES OVERTAKES COAL
How the heck did that happen so quickly?!...🧵
How the heck did that happen so quickly?!...🧵
October 7, 2025 at 1:30 PM
There is still some hopeful news out there! Of course we need coal to go down... not just stay flat (but flat is better than rising...).
Reposted by Linn Boldt-Christmas
Sweden is not only an @esa.int founding member and a host of the Esrange Space Centre in Kiruna, but also an important contributor of Ariane 6.
GKN Aerospace, based in Sweden, provides turbines and nozzle extensions for Ariane 6's rocket engines.
www.esa.int/Enabling_Sup...
GKN Aerospace, based in Sweden, provides turbines and nozzle extensions for Ariane 6's rocket engines.
www.esa.int/Enabling_Sup...
October 7, 2025 at 8:46 AM
Sweden is not only an @esa.int founding member and a host of the Esrange Space Centre in Kiruna, but also an important contributor of Ariane 6.
GKN Aerospace, based in Sweden, provides turbines and nozzle extensions for Ariane 6's rocket engines.
www.esa.int/Enabling_Sup...
GKN Aerospace, based in Sweden, provides turbines and nozzle extensions for Ariane 6's rocket engines.
www.esa.int/Enabling_Sup...
🔭🧪🪐Fabulous article in BBC today marking the 30th anniversary of 51 Peg b, discussing also the hunt for Earth-like #exoplanets with the Terra Hunting Experiment @terrahunting.bsky.social — can’t believe we’re so close to starting this incredible survey (later this year)!
www.bbc.com/future/artic...
www.bbc.com/future/artic...
The epic hunt for a planet just like Earth
Exoplanet hunters Christopher Watson and Annelies Mortier explain the long search for a 'twin Earth' capable of sustaining life.
www.bbc.com
October 5, 2025 at 10:55 AM
🔭🧪🪐Fabulous article in BBC today marking the 30th anniversary of 51 Peg b, discussing also the hunt for Earth-like #exoplanets with the Terra Hunting Experiment @terrahunting.bsky.social — can’t believe we’re so close to starting this incredible survey (later this year)!
www.bbc.com/future/artic...
www.bbc.com/future/artic...
Reposted by Linn Boldt-Christmas
Almost exactly 30 years ago, the first extrasolar planet was identified orbiting a main-sequence star.
Now, not only can we directly image planets orbiting other stars, but we can see planets *being born*
Imagine what the next 30 years will bring.
Now, not only can we directly image planets orbiting other stars, but we can see planets *being born*
Imagine what the next 30 years will bring.
October 3, 2025 at 3:02 AM
Almost exactly 30 years ago, the first extrasolar planet was identified orbiting a main-sequence star.
Now, not only can we directly image planets orbiting other stars, but we can see planets *being born*
Imagine what the next 30 years will bring.
Now, not only can we directly image planets orbiting other stars, but we can see planets *being born*
Imagine what the next 30 years will bring.