Evert Nasedkin
@evertnasedkin.bsky.social
Pinned
Evert Nasedkin
@evertnasedkin.bsky.social
Β· Sep 26
π It's paper day! Today I'm sharing the latest in a series of papers looking at the weather on other worlds, in this case bringing you the weather report from a nearby T-dwarf, SIMP-0136. πͺ
𧡠to follow...
𧡠to follow...
Reposted by Evert Nasedkin
The demand to use #NASAWebb shows no signs of slowing! For its fifth year, researchers around the world submitted a record-breaking 2,900+ proposals.
The types of requests show astronomers are ready to answer even bolder scientific questions: https://bit.ly/4nYC0LS π π§ͺ
The types of requests show astronomers are ready to answer even bolder scientific questions: https://bit.ly/4nYC0LS π π§ͺ
November 12, 2025 at 3:06 PM
The demand to use #NASAWebb shows no signs of slowing! For its fifth year, researchers around the world submitted a record-breaking 2,900+ proposals.
The types of requests show astronomers are ready to answer even bolder scientific questions: https://bit.ly/4nYC0LS π π§ͺ
The types of requests show astronomers are ready to answer even bolder scientific questions: https://bit.ly/4nYC0LS π π§ͺ
The NH3 absorption starting circa 2027 is going to be a wild ride.
November 11, 2025 at 8:22 AM
The NH3 absorption starting circa 2027 is going to be a wild ride.
Reposted by Evert Nasedkin
Lammers and Winn βOn the Exoplanet Yield of Gaia Astrometryβ makes breathtaking predictions for the Gaia DR4 data release in December 2026 - around 7500 new exoplanets around nearby stars! It will be revolutionaryβ¦ and indicate new nearby systems to be imagedβ¦ #astrodon #exoplanets βοΈ
November 7, 2025 at 8:34 AM
Lammers and Winn βOn the Exoplanet Yield of Gaia Astrometryβ makes breathtaking predictions for the Gaia DR4 data release in December 2026 - around 7500 new exoplanets around nearby stars! It will be revolutionaryβ¦ and indicate new nearby systems to be imagedβ¦ #astrodon #exoplanets βοΈ
Reposted by Evert Nasedkin
Hey, astronomers. Can you imagine astronomy research without ADS?!?!? No? So, have you filled out the ADS survey yet?
Help archives help you!
(Help archives keep funding!)
docs.google.com/forms/d/e/1F...
Help archives help you!
(Help archives keep funding!)
docs.google.com/forms/d/e/1F...
Astrophysics Data System (ADS) User Feedback Survey
Thank you for taking the time to provide feedback on the Astrophysics Data System (ADS) digital library. Your insights will help us improve the platform and better serve the scientific community. All ...
docs.google.com
November 5, 2025 at 7:21 PM
Hey, astronomers. Can you imagine astronomy research without ADS?!?!? No? So, have you filled out the ADS survey yet?
Help archives help you!
(Help archives keep funding!)
docs.google.com/forms/d/e/1F...
Help archives help you!
(Help archives keep funding!)
docs.google.com/forms/d/e/1F...
Reposted by Evert Nasedkin
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! ππ§ͺ
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! ππ§ͺ
www.uu.se/institution/...
www.uu.se/institution/...
Super useful stuff from @jlothringer.bsky.social! Now that we're starting to measure compositions with decent precision it's important to worry about what we mean by 'solar' or 'metallicity', and make sure that we're comparing apples to apples!
We've collected 65 individual exoplanet atmosphere composition measurements to look for population-level trends π #exoplanets
To do this, we had to create a toolkit to standardize between definitions of . We call it ExoComp. (Yes, that's a Star Trek reference π).
To do this, we had to create a toolkit to standardize between definitions of . We call it ExoComp. (Yes, that's a Star Trek reference π).
October 31, 2025 at 2:55 PM
Super useful stuff from @jlothringer.bsky.social! Now that we're starting to measure compositions with decent precision it's important to worry about what we mean by 'solar' or 'metallicity', and make sure that we're comparing apples to apples!
Exciting opportunity for anyone looking to start a PhD! I can only give the highest praise to @paulmolliere.bsky.social as a supervisor! π
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 12:49 PM
Exciting opportunity for anyone looking to start a PhD! I can only give the highest praise to @paulmolliere.bsky.social as a supervisor! π
Nevermind, turns out I just can't count after writing proposals all week. Only 2200 on my end
October 15, 2025 at 9:40 PM
Nevermind, turns out I just can't count after writing proposals all week. Only 2200 on my end
I've seen over 2500 π
October 15, 2025 at 9:33 PM
I've seen over 2500 π
Brown dwarfs are macroscopic quantum objects - Nobel prize for you in a couple decades!
October 15, 2025 at 2:29 PM
Brown dwarfs are macroscopic quantum objects - Nobel prize for you in a couple decades!
Can you argue that brown dwarfs are condensed matter?
October 15, 2025 at 7:40 AM
Can you argue that brown dwarfs are condensed matter?
Reposted by Evert Nasedkin
Books Upstairs is a fine store with a particularly excellent poetry section. Why not support them by ordering your books online instead: booksupstairs.ie
βReally shockingβ: Independent Dublin bookstore damaged in arson attack
βReally shockingβ: Independent Dublin bookstore damaged in arson attack
Books Upstairs manager hopes to partially open the DβOlier Street store later on Monday
www.irishtimes.com
October 6, 2025 at 11:36 AM
Books Upstairs is a fine store with a particularly excellent poetry section. Why not support them by ordering your books online instead: booksupstairs.ie
Reposted by Evert Nasedkin
I wrote another paper! And yes it's about brown dwarfs wait don't go anywhere they're really neat
arxiv.org/abs/2510.00111
arxiv.org/abs/2510.00111
JADES: An Abundance of Ultra-Distant T- and Y-Dwarfs in Deep Extragalactic Data
Ultra-cool T- (T$_{\mathrm{eff}} \approx$ 500 - 1200 K) and Y-dwarfs (T$_{\mathrm{eff}}$ $\lessapprox 500$ K) have historically been found only a few hundred parsecs from the Sun. The sensitivity and ...
arxiv.org
October 2, 2025 at 2:59 AM
I wrote another paper! And yes it's about brown dwarfs wait don't go anywhere they're really neat
arxiv.org/abs/2510.00111
arxiv.org/abs/2510.00111
Reposted by Evert Nasedkin
The Norman Lockyer Fellowship is a great opportunity for postdoc research in #Exoplanets, and we'd love to host you at St Andrews!
Feel free to reach out if you're interested in joining our exoplanet group in beautiful Scotland π΄σ §σ ’σ ³σ £σ ΄σ Ώπͺ
Feel free to reach out if you're interested in joining our exoplanet group in beautiful Scotland π΄σ §σ ’σ ³σ £σ ΄σ Ώπͺ
π§βπ¬ Need funding to support your research?π§βπ¬
We're now accepting applications for the Norman Lockyer Fellowship, offered to outstanding candidates to enable them to pursue research in the UK in the disciplines advanced by the Royal Astronomical Society. ππͺ
‡οΈ
We're now accepting applications for the Norman Lockyer Fellowship, offered to outstanding candidates to enable them to pursue research in the UK in the disciplines advanced by the Royal Astronomical Society. ππͺ
‡οΈ
October 3, 2025 at 11:47 AM
The Norman Lockyer Fellowship is a great opportunity for postdoc research in #Exoplanets, and we'd love to host you at St Andrews!
Feel free to reach out if you're interested in joining our exoplanet group in beautiful Scotland π΄σ §σ ’σ ³σ £σ ΄σ Ώπͺ
Feel free to reach out if you're interested in joining our exoplanet group in beautiful Scotland π΄σ §σ ’σ ³σ £σ ΄σ Ώπͺ
Reposted by Evert Nasedkin
Iβm thrilled to announce a new paper that went up on the arXiv last night: arxiv.org/abs/2510.02260! The paper finds and maps the connections between clouds, temperature structure, and chemistry in the isolate exoplanet analog SIMP 0136. Very grateful to all my collaborators and co-authors!
Mapping the Cloud-Driven Atmospheric Dynamics & Chemistry of an Isolated Exoplanet Analog with Harmonic Signatures
Young planetary-mass objects and brown dwarfs near the L/T spectral transition exhibit enhanced spectrophotometric variability over field brown dwarfs. Patchy clouds, auroral processes, stratospheric ...
arxiv.org
October 3, 2025 at 12:33 PM
Iβm thrilled to announce a new paper that went up on the arXiv last night: arxiv.org/abs/2510.02260! The paper finds and maps the connections between clouds, temperature structure, and chemistry in the isolate exoplanet analog SIMP 0136. Very grateful to all my collaborators and co-authors!
Great article in @discovermag.bsky.social about our work on SIMP-0136!
New JWST Data Shows Rogue Planet With a Colorful Combo of Wavelengths, Strong Storms, and Beautiful Auroras www.discovermagazine.com/new-jwst-dat...
New JWST Data Shows Rogue Planet With a Colorful Combo of Wavelengths, Strong Storms, and Beautiful Auroras
Learn about SIMP-0136, a rogue planet emitting wavelengths that reveal patchy clouds and auroras similar to the Northern Lights.
www.discovermagazine.com
September 28, 2025 at 8:48 AM
Great article in @discovermag.bsky.social about our work on SIMP-0136!
Congratulations Doctor!!!!!
September 26, 2025 at 4:10 PM
Congratulations Doctor!!!!!
Reposted by Evert Nasedkin
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/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.
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...
arxiv.org
September 26, 2025 at 4:25 AM
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/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.
There's a lot to unpack from the paper; the main takeaway is that we're starting to really see these objects in 3D! In the future, we want to really look at how the atmosphere itself evolves over time, rather than just looking at the rotational modulation - this would really be the weather!
September 26, 2025 at 9:05 AM
There's a lot to unpack from the paper; the main takeaway is that we're starting to really see these objects in 3D! In the future, we want to really look at how the atmosphere itself evolves over time, rather than just looking at the rotational modulation - this would really be the weather!
This is very similar to the atmosphere of Jupiter, which can be warmed by its aurora: electrons and charged particles impact the upper atmosphere and deposit energy, heating it up. From radio observations, we know SIMP-0136 hosts a powerful aurora, so it was exciting to confirm its effects with JWST
September 26, 2025 at 9:05 AM
This is very similar to the atmosphere of Jupiter, which can be warmed by its aurora: electrons and charged particles impact the upper atmosphere and deposit energy, heating it up. From radio observations, we know SIMP-0136 hosts a powerful aurora, so it was exciting to confirm its effects with JWST
We were also surprised to see a temperature inversion in the atmosphere. For an isolated brown dwarf, we normally would expect the atmosphere to cool as the altitude increases. Instead, we found that it got warmer at about a millibar in pressure.
September 26, 2025 at 9:05 AM
We were also surprised to see a temperature inversion in the atmosphere. For an isolated brown dwarf, we normally would expect the atmosphere to cool as the altitude increases. Instead, we found that it got warmer at about a millibar in pressure.
With these retrievals, we were able to directly measure small changes in the temperature, chemistry, and clouds. While before we often thought that the variability would be due to looking at more- or less patchy regions of cloud coverage, now we find that it's more due to changes in the temperature!
September 26, 2025 at 9:05 AM
With these retrievals, we were able to directly measure small changes in the temperature, chemistry, and clouds. While before we often thought that the variability would be due to looking at more- or less patchy regions of cloud coverage, now we find that it's more due to changes in the temperature!
We used JWST to observe one full rotation each with NIRSpec/PRISM and MIRI/LRS (this is the same data as in the paper from @alliemccarthy.bsky.social earlier this year). This time however, we used atmospheric retrievals to measure how the different properties change as SIMP-0136 rotates.
September 26, 2025 at 9:05 AM
We used JWST to observe one full rotation each with NIRSpec/PRISM and MIRI/LRS (this is the same data as in the paper from @alliemccarthy.bsky.social earlier this year). This time however, we used atmospheric retrievals to measure how the different properties change as SIMP-0136 rotates.
The full article is now available here. It's been a big team effort, with the help of @johannavos.bsky.social, Merle Schrader, @maddielam.bsky.social, @astrotoole.bsky.social, and all the rest of my coauthors.
www.aanda.org/articles/aa/...
www.aanda.org/articles/aa/...
The JWST weather report: Retrieving temperature variations, auroral heating, and static cloud coverage on SIMP-0136 | Astronomy & Astrophysics (A&A)
Astronomy & Astrophysics (A&A) is an international journal which publishes papers on all aspects of astronomy and astrophysics
www.aanda.org
September 26, 2025 at 9:05 AM
The full article is now available here. It's been a big team effort, with the help of @johannavos.bsky.social, Merle Schrader, @maddielam.bsky.social, @astrotoole.bsky.social, and all the rest of my coauthors.
www.aanda.org/articles/aa/...
www.aanda.org/articles/aa/...
π It's paper day! Today I'm sharing the latest in a series of papers looking at the weather on other worlds, in this case bringing you the weather report from a nearby T-dwarf, SIMP-0136. πͺ
𧡠to follow...
𧡠to follow...
September 26, 2025 at 9:05 AM
π It's paper day! Today I'm sharing the latest in a series of papers looking at the weather on other worlds, in this case bringing you the weather report from a nearby T-dwarf, SIMP-0136. πͺ
𧡠to follow...
𧡠to follow...