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Reposted by Evert Nasedkin

Markus Eichhorn @markuseichhorn.bsky.social · 2d

Books Upstairs is a fine store with a particularly excellent poetry section. Why not support them by ordering your books online instead: booksupstairs.ie

The Irish Times @irishtimes.com · 2d

‘Really shocking’: Independent Dublin bookstore damaged in arson attack

Books Upstairs manager hopes to partially open the D’Olier Street store later on Monday

www.irishtimes.com

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Kevin Hainline @kevinhainline.bsky.social · 7d

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

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

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Dr Ryan MacDonald @distantworlds.space · 5d

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 🏴󠁧󠁢󠁳󠁣󠁴󠁿🪐

Royal Astronomical Society @royalastrosoc.bsky.social · 5d

🧑‍🔬 Need funding to support your research?🧑‍🔬

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. 🔭🪐

⤵️

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Michael Plummer @magmaskies.bsky.social · 5d

I’m 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

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Evert Nasedkin @evertnasedkin.bsky.social · 10d

Great article in @discovermag.bsky.social about our work on SIMP-0136!

Jennifer Ouellette @jenlucpiquant.bsky.social · 11d

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

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Evert Nasedkin @evertnasedkin.bsky.social · 12d

Congratulations Doctor!!!!!

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Jonathan Fortney @jjfplanet.bsky.social · 12d

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.

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

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Evert Nasedkin @evertnasedkin.bsky.social · 12d

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!

A poster entitled the weather report from SIMP-0136, summarizing the findings of the the paper "The JWST weather report: Retrieving temperature variations, auroral heating, and static cloud coverage on SIMP-0136".

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Evert Nasedkin @evertnasedkin.bsky.social · 12d

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

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Evert Nasedkin @evertnasedkin.bsky.social · 12d

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.

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Evert Nasedkin @evertnasedkin.bsky.social · 12d

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!

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Evert Nasedkin @evertnasedkin.bsky.social · 12d

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.

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Evert Nasedkin @evertnasedkin.bsky.social · 12d

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/...

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

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Evert Nasedkin @evertnasedkin.bsky.social · 12d

🔭 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. 🪐

🧵 to follow...

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Linn Boldt-Christmas @nplinnspace.bsky.social · 21d

*So* excited about our pre-print on TSD: Transmission Spectroscopy Decomposition, a novel algorithm that basically delivers your nIR high res #exoplanet 's transmission spectrum without PCA/SYSREM. There might be a 🧵 later, so for now, I'll let this speak for itself... ⬇️

arxiv.org/abs/2509.12737 🧪🔭

Text from the paper:

5. DISCUSSION AND CONCLUSIONS
We have presented a novel method for recovering the high-resolution transmission spectrum (effective blocking area
of a planet) from high-resolution transmission spectroscopy observations. The new method is formulated as an inverse
problem and it reconstructs three main functions: stellar spectrum, telluric spectrum, and the planetary transmission
spectrum. The first two can be verified independently against the observations outside transit or observations of a
telluric standard, where they show good agreement with expectations. The main benefit of using TSD is that it does not
include any model assumptions about the exoplanetary atmosphere, its chemical composition, pressure-temperature
gradients, or vertical stratification. This enables model-based analyses to be done on the resulting transmission
spectrum, not unlike classical stellar spectroscopy. TSD can naturally combine multiple transits as it in fact requires
more than one transit to work. Ideally, several transits (5-7) with strategically selected barycentric velocities should
be combined to obtain the best results, as this enables us to recover planetary features that are “behind” telluric
absorption on a given night. Many exoplanets are known to have supersonic winds, and if these are globally coherent,
TSD will show their signatures in the recovered line profiles.

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Laura Kreidberg @lkreidberg.bsky.social · 23d

We have job opportunities in the APEx department at MPIA - please spread the word!

Postdocs: aas.org/jobregister/...
Tenure-track staff: aas.org/jobregister/...
Max Planck Research Group Leaders: aas.org/jobregister/...

+ happy to host ERC, Humboldt, and other third-party funds.

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Sarah E Moran @offallingstars.bsky.social · 29d

✨✨✨Another Virga advert✨✨✨

Introducing V2.0, with fractal aggregate clouds! Restricted to spheres no more! We handle the dynamics and the optics self consistently.

Led by me and PhD candidate extraordinaire Matt Lodge (who is looking for a postdoc 👀 and is amazing).

arxiv.org/abs/2509.06708

Fractal Aggregate Aerosols in the Virga Cloud Code I: Model Description and Application to a Benchmark Cloudy Exoplanet

We introduce new functionality to treat fractal aggregate aerosol particles within the Virga cloud modeling framework. Previously, the open source cloud modeling code Virga (Batalha et al. 2025), the ...

arxiv.org

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Evert Nasedkin @evertnasedkin.bsky.social · Sep 8

Wow, I had no idea that there were hosting costs associated with the feeds, let alone that you were covering it out of pocket!

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Emily Hunt @emily.space · Sep 8

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

The Astrosky Ecosystem - Open Collective

We're building an open-source ecosystem of social media tools for the space science & astronomy communities.

opencollective.com

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ESO @eso.org · Aug 26

A very hungry planet! 🪐

What appears to be a ripple in space is actually a newborn planet, eating its way through its dusty cradle around a younger version of our Sun 🌞

Read more: https://www.eso.org/public/images/potw2534a/

🔭 🧪 #exoplanets
📷 ESO/R. van Capelleveen et al.

A white protoplanetary disc at the centre of the picture takes up most of the frame. The elliptical cloud of dust and gas consists of some gaps creating a ring-like structure to the cloud. In one of the larger gaps/rings a little dot (a planet) is visible.

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Evan @evan.best · Aug 27

⭐️⭐️⭐️⭐️⭐️
Legendary quote by @whysharksmatter.bsky.social. No additional comment necessary.

arstechnica.com/science/2025...

"When I talk about fish on Bluesky, people ask me questions about fish. When I talk about fish on Twitter, people threaten to murder my family because we're Jewish."

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Matthew Kenworthy @mattkenworthy.bsky.social · Aug 26

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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Evert Nasedkin @evertnasedkin.bsky.social · Aug 15

I think CanariCam on the GTC is still going strong, it has imagine and spectroscopy from 7.5-25um!

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Emily L. Hauser (she/her) ❌👑 @emilylhauser.bsky.social · Aug 6

I think it's really worth noting that this concentration camp was opened one month and three days ago.

This woman saw enough horror in that time to quit and tell the public what she saw.

Which suggests that it's not as bad as we think, or as bad as we can envision from her description—it's worse.

NBC News @nbcnews.com · Aug 6

A former “Alligator Alcatraz” worker says detainees are subject to “inhumane” conditions — packed by the hundreds into cages without sunlight, with overflowing toilets and limited access to showers.

Former 'Alligator Alcatraz' worker describes 'inhumane' conditions inside

In an exclusive report, NBC6 spoke with a former corrections officer who says she saw hundreds held in cages with no sunlight, backed up toilets and little access to showers.

nbcnews.to

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Anna Hughes 🍁 @annaghughes.bsky.social · Jul 30

I've had a few other former astronomers reach out to me lately about transitioning into data science/ML, and I decided to write about it.

This is my personal journey from astro to ocean, and the most useful steps I took along the way.

out of academia

Out of Academia

www.annagwenhughes.com

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