In @aunz.theconversation.com , Laura McKemmish discusses why astronomers are interested in phosphine. How should we interpret its abundance in planets and brown dwarfs? #stellarastro #exoplanet #chemsky ☄️
theconversation.com/mysterious-m...
theconversation.com/mysterious-m...
Mysterious molecule found on brown dwarf casts further doubt on potential signs of life on Venus
A failed star just taught us something new about the search for alien life.
theconversation.com
October 6, 2025 at 11:05 AM
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The phosphine molecule, PH3, has been proposed as a biosignature in rocky planets. In @science.org, Burgasser et al. report phosphine in a brown dwarf atmosphere. "We therefore caution against the use of phosphine as a biosignature". #stellarastro #exoplanet ☄️
www.science.org/doi/10.1126/...
www.science.org/doi/10.1126/...
Observation of undepleted phosphine in the atmosphere of a low-temperature brown dwarf
The atmospheres of low-temperature brown dwarfs and gas giant planets are expected to contain the phosphine molecule, PH3. However, previous observations have shown much lower abundances of this molec...
www.science.org
October 6, 2025 at 10:54 AM
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🔭 New paper of the @sagateam.bsky.social accepted in A&A!
This is the first paper of the upcoming "Playing CHESS with stars" series!
The paper was lead by John Martínez Fernández and Sergen Özdemir, Ph.D. students at the SAGA Team
arxiv.org/abs/2509.19443
#stellarastro #SagaTeamCAMK
This is the first paper of the upcoming "Playing CHESS with stars" series!
The paper was lead by John Martínez Fernández and Sergen Özdemir, Ph.D. students at the SAGA Team
arxiv.org/abs/2509.19443
#stellarastro #SagaTeamCAMK
October 3, 2025 at 8:55 AM
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It is paper time ! If you wondered how the Gaia catalogue of solar-like rotators compared with the stars observed by the Kepler/K2 missions here are some elements of answers !
Here is the link to the article we published in A&A:
www.aanda.org/articles/aa/...
#stellarastro
Here is the link to the article we published in A&A:
www.aanda.org/articles/aa/...
#stellarastro
September 29, 2025 at 1:57 PM
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A team from Uruguay & Mexico have found an RR Lyrae variable star associated with an intermediate-age (~4 Gyr old) cluster, Trumpler 5. 🔭☄️🧪 #stellarastro
There is a growing body of evidence that binary interactions can make RR Lyrae at much younger ages, and this paper seems pretty conclusive!
There is a growing body of evidence that binary interactions can make RR Lyrae at much younger ages, and this paper seems pretty conclusive!
First direct detection of an RR Lyrae star conclusively associated with an intermediate-age cluster
RR Lyrae stars have long been considered unequivocal tracers of old (>10 Gyr) and metal-poor ($\mathrm{[Fe/H]}<-0.5$) stellar populations. First, because these populations are where they are readily f...
arxiv.org
September 29, 2025 at 6:29 AM
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#stellarastro 🔭🌟 look at all the rotation periods @meirs.bsky.social measured from the ground!!
arxiv.org/abs/2509.14423
⭐️paper day!⭐️
hey now, we found thousands of stellar variability periods, including ~26k very high likelihood new ASAS-SN rotation periods from cool dwarfs!
(also I have missed abt 5 typos in this version already, but it’s only been submitted to ApJS so it’ll get fixed!)..
⭐️paper day!⭐️
hey now, we found thousands of stellar variability periods, including ~26k very high likelihood new ASAS-SN rotation periods from cool dwarfs!
(also I have missed abt 5 typos in this version already, but it’s only been submitted to ApJS so it’ll get fixed!)..
200,000+ Deep Learning Inferred Periods of Stellar Variability from The All-Sky Automated Survey for Supernovae
Stars exhibit a range of variability periods that depend on their mass, age, and evolutionary stage. For space-based photometric data, convolutional neural networks (CNNs) have demonstrated success in...
arxiv.org
September 19, 2025 at 4:51 PM
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The article is now published in the Astrophysical Journal: doi.org/10.3847/1538...
And data are now public on MAST: archive.stsci.edu/hlsp/owls
#stellarastro #StarsAreStillInteresting 🔭
And data are now public on MAST: archive.stsci.edu/hlsp/owls
#stellarastro #StarsAreStillInteresting 🔭
September 10, 2025 at 1:12 PM
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🧵
Sept. 1-2, 1859: The Carrington Event, during the solar cycle 10.
On 1 Sept. 1859, English astronomers Richard Carrington and Richard Hodgson noticed a sudden brightening on the Sun's surface like they'd never seen before— the first record of a solar flare... 1/5
🔭 🧪 #stellarastro #histsci
Sept. 1-2, 1859: The Carrington Event, during the solar cycle 10.
On 1 Sept. 1859, English astronomers Richard Carrington and Richard Hodgson noticed a sudden brightening on the Sun's surface like they'd never seen before— the first record of a solar flare... 1/5
🔭 🧪 #stellarastro #histsci
September 1, 2025 at 4:42 PM
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🧵
A groundbreaking study in A&A (Anderson & Hunt, 2025) has used the third Gaia data release to map stellar evolution, analyzing 34,760 variable stars in 1,192 Galactic open clusters (OCs).
Here are the key points:
- Variable stars as cosmic guides. 1/8
🔭 🧪 #stellarastro @emily.space
A groundbreaking study in A&A (Anderson & Hunt, 2025) has used the third Gaia data release to map stellar evolution, analyzing 34,760 variable stars in 1,192 Galactic open clusters (OCs).
Here are the key points:
- Variable stars as cosmic guides. 1/8
🔭 🧪 #stellarastro @emily.space
August 30, 2025 at 4:23 PM
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Sweet NASA feature article on @sabinastro.bsky.social's work on mapping stellar surfaces: 🔭🧪 #stellarastro
science.nasa.gov/missions/tes...
Why? Because:
1) #StarsAreStillInteresting
2) Messy stars complicate our view of exoplanet atmospheres. To remove stellar contamination, you must map it. 🗺️
science.nasa.gov/missions/tes...
Why? Because:
1) #StarsAreStillInteresting
2) Messy stars complicate our view of exoplanet atmospheres. To remove stellar contamination, you must map it. 🗺️
Astronomers Map Stellar ‘Polka Dots’ Using NASA’s TESS, Kepler - NASA Science
Scientists have devised a new method for mapping the spottiness of distant stars by using observations from NASA missions of orbiting planets crossing their
science.nasa.gov
August 25, 2025 at 3:34 PM
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Today on arXiv, a study on the subgiant and "young" red giant stars of Kepler, which have oscillation frequencies close to the Nyquist frequency of the satellite !
#astrosci #stellarastro
arxiv.org/abs/2508.15654
#astrosci #stellarastro
arxiv.org/abs/2508.15654
Beyond the Nyquist frequency: Asteroseismic catalog of undersampled Kepler late subgiants and early red giants
Subgiants and early red giants are crucial for studying the first dredge-up, a key evolutionary phase where the convective envelope deepens, mixing previously interior-processed material and bringing ...
arxiv.org
August 22, 2025 at 1:47 PM
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New update on the ALS catalogue! 🌌 #galactic #stellarastro
For this third version, Pantaleoni González et al. further expanded their list, combining Gaia DR3 with spectroscopic surveys. This allowed them to map out the position of more than 15,000 massive OB stars in the Milky Way!
For this third version, Pantaleoni González et al. further expanded their list, combining Gaia DR3 with spectroscopic surveys. This allowed them to map out the position of more than 15,000 massive OB stars in the Milky Way!
August 21, 2025 at 10:34 AM
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Lots of exciting talks and posters, ranging from Galactic & Extragalactic star formation to stellar clusters & associations! 🌌🔭📡 #stellarastro #galactic
Check out the latest updates on our website.
For example, the schedule is now online🥳 You can see the titles of the presentations, as well as of the posters!
stellarorigins2025.univie.ac.at/program
For example, the schedule is now online🥳 You can see the titles of the presentations, as well as of the posters!
stellarorigins2025.univie.ac.at/program
Program
Program
stellarorigins2025.univie.ac.at
August 20, 2025 at 11:23 AM
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Star formation primarily takes place within compact clusters in the local Milky Way! 🌌 #galactic #stellarastro
We've shown this combining the results from two recent, Gaia-based catalogues: the open clusters census from @emily.space and my census of OB stars within 1 kpc!
We've shown this combining the results from two recent, Gaia-based catalogues: the open clusters census from @emily.space and my census of OB stars within 1 kpc!
Most stars form in clusters! 🔭🧪☄️ #galactic
In a new paper led by @alexis-space.bsky.social, we show that >80% of stars in the local Milky Way formed in clusters.
This is *much* higher than other recent estimates (~15%), and supports more traditional 'clustered' models of star formation!
In a new paper led by @alexis-space.bsky.social, we show that >80% of stars in the local Milky Way formed in clusters.
This is *much* higher than other recent estimates (~15%), and supports more traditional 'clustered' models of star formation!
How many stars form in compact clusters in the local Milky Way?
Two main models coexist for the environment in which stars form. The clustered model stipulates that the bulk of star formation occurs within dense embedded clusters, but only a minority of them survi...
arxiv.org
August 19, 2025 at 10:01 AM
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It will be possible to do a lot of really amazing empirical analysis of how stars vary as they evolve within clusters, and "this paper, but on steroids" will be possible very soon. Stay tuned!!! 🔭☄️🧪 #stellarastro
A bird's eye view of stellar evolution through populations of variable stars in Galactic open clusters
Both star clusters and variable stars are sensitive laboratories of stellar astrophysics and evolution: cluster member stars provide context for interpreting cluster populations, whereas variability r...
arxiv.org
August 19, 2025 at 9:46 AM
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What happens if you combine @esa.int's Gaia satellite's variable star classifications with open clusters? 🔭☄️🧪 #stellarastro
In paper #2 out today, Richard Anderson & I collaborated on doing just that and seeing what we could learn! There are tons of pretty plots and insights, so let's dive in ⤵️
In paper #2 out today, Richard Anderson & I collaborated on doing just that and seeing what we could learn! There are tons of pretty plots and insights, so let's dive in ⤵️
August 19, 2025 at 9:46 AM
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The first paper of the "Eclipsing Binary Patrol" project, hosted on Zooniverse, is now on the Astrophysical Journal Supplement Series.
The contribute of many people (and mine), in the support of the science and the researchers.
iopscience.iop.org/article/10.3...
#stellarastro #variablestars
The contribute of many people (and mine), in the support of the science and the researchers.
iopscience.iop.org/article/10.3...
#stellarastro #variablestars
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August 1, 2025 at 9:41 PM
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RIP to Bill Paxton, lead developer of MESA. I feel privileged to have learned from the man himself at the 2012 MESA Summer School. #stellarastro #astrocode
July 30, 2025 at 1:04 PM
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This captivating image shows the Double Cluster (also known as Caldwell 14).
It consists of two open clusters: NGC 869 (above right) and NGC 884 that are relatively young, both 14 million years old.
Source ➡️ apod.nasa.gov/apod/ap13010...
🔭 🧪 #science #stellarastro
This captivating image shows the Double Cluster (also known as Caldwell 14).
It consists of two open clusters: NGC 869 (above right) and NGC 884 that are relatively young, both 14 million years old.
Source ➡️ apod.nasa.gov/apod/ap13010...
🔭 🧪 #science #stellarastro
July 27, 2025 at 3:31 PM
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A 🧵
For centuries, Betelgeuse, the iconic red supergiant in Orion, has fascinated astronomers with its changing brightness.
Why does its light vary over a ~6-year cycle?
Thanks to the Gemini North telescope, we now have an answer: Betelgeuse has a companion star!
🔭 🧪 #stellarastro #galactic
For centuries, Betelgeuse, the iconic red supergiant in Orion, has fascinated astronomers with its changing brightness.
Why does its light vary over a ~6-year cycle?
Thanks to the Gemini North telescope, we now have an answer: Betelgeuse has a companion star!
🔭 🧪 #stellarastro #galactic
July 24, 2025 at 2:16 PM
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Welcome to the Stellar Astronomy feed!
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FAQ: The Stellar Astronomy Feed
Frequently asked questions about the Stellar Astronomy feed.
astrosky.eco
July 16, 2025 at 9:56 AM
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Welcome to the Stellar Astronomy feed!
• You need to sign up for your posts to appear here.
• Then, add #stellarastrononomy or #stellarastro to your post.
• Check out our other feeds!
See the FAQ for more info:
• You need to sign up for your posts to appear here.
• Then, add #stellarastrononomy or #stellarastro to your post.
• Check out our other feeds!
See the FAQ for more info:
FAQ: The Stellar Astronomy Feed
Frequently asked questions about the Stellar Astronomy feed.
astrosky.eco
July 16, 2025 at 9:52 AM
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Welcome to the Stellar Astronomy feed!
• You need to sign up• Then, add #stellarastrononomy or #stellarastro to your post.
for your posts to appear here.
• Check out our other feeds!
See the FAQ for more info:
• You need to sign up• Then, add #stellarastrononomy or #stellarastro to your post.
for your posts to appear here.
• Check out our other feeds!
See the FAQ for more info:
FAQ: The Stellar Astronomy Feed - The Astrosky Ecosystem
Frequently asked questions about the Stellar Astronomy
astrosky.eco
July 16, 2025 at 9:45 AM
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Variable Stars from the Gaia DR3 Epoch Photometry by the G-band fluxes.
This is an amateur approach to the analysis of the light from a variable star.
Gaia DR3 409684702600599424
Coordinates (2016.0): 24.07735600488 , 56.47612360587
#variablestars #gaia #stellarastro
#gaiadr3_409684702600599424
This is an amateur approach to the analysis of the light from a variable star.
Gaia DR3 409684702600599424
Coordinates (2016.0): 24.07735600488 , 56.47612360587
#variablestars #gaia #stellarastro
#gaiadr3_409684702600599424
July 13, 2025 at 4:34 PM
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Until the spectra are available on MAST, here's an interactive visualization app for exploring OWLS spectra and the corresponding MWO HK Project chromospheric activity time series, when available. 🔭🧪 #stellarastro
Try it out: github.com/bmorris3/owl...
Powered by viz tools from @stsci.edu! ❤️
Try it out: github.com/bmorris3/owl...
Powered by viz tools from @stsci.edu! ❤️
July 11, 2025 at 11:05 AM
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