#brown-dwarf — Public Fediverse posts

Weekly Update from the Open Journal of Astrophysics 25/07/2026

It’s time once more for another Saturday update of activity at the Open Journal of Astrophysics. Since the last update we have published a further nine papers, bringing the number in Volume 9 (2026) to 160 and the total so far published by OJAp up to 608.

I will continue to include the posts made on our Mastodon account (on Fediscience); these announcements also show the DOI for each paper.

The first paper to report this week was published on Tuesday 21st July in the folder Cosmology and Nongalactic Astrophysics. The title is “Characterization of the Polarization Beam Response of SPT-3G Using Point Sources” by Tijmen de Haan (Institute of Particle and Nuclear Studies, Ibaraki, Japan) and an international cast of 101 others. This study presents measurements of the South Pole Telescope’s polarized beam response, indicating minimal sidelobe depolarization. The findings suggest potential explanations for frequency-dependent residuals in power spectrum analysis.

The overlay for this paper is here

You can find the officially accepted version on arXiv here and the announcement on Fediverse here:

https://fediscience.org/@OJ_Astro/116956682988048349

The second paper for this week, also published on Tuesday 21st July but in the folder Earth and Planetary Astrophysics is: “Exploring TRAPPIST-1 Climate States with an Energy Balance Model” by Jacob Haqq-Misra (Blue Marble Space, USA). The study uses a modified HEXTOR energy balance model to predict climate states of terrestrial planets orbiting low-mass stars, suggesting partial to complete ice cover for TRAPPIST-1 e and f.Abstractfor Exploring TRAPPIST-1 Climate States with an Energy Balance Model.

The overlay looks like this:

The official version of the paper can be found on arXiv here and the Fediverse announcement here:

https://fediscience.org/@OJ_Astro/116956824712105776

The third paper of the week, also published on Tuesday 21st July, but in the folder Astrophysics of Galaxies is “A first systematic study of [OIII] 88μm at z>8: two luminous oxygen lines and a powerful ionized outflow in the first 600 million years” by Hiddo Algera (Institute of Astronomy and Astrophysics, Taipei, Taiwan) and 37 others from all around the world. This paper presents deep observations of four UV-bright, gravitationally lensed galaxies, revealing an ionized outflow in one and highlighting the diagnostic power of [O III]88 μm in studying galaxies in the early Universe.

The overlay for this one is here:

The final, accepted version can be found on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116956879536002543

The fourth paper of the week, published on Thursday 23rd July in the folder Astrophysics of Galaxies, is “Mapping CO Ice in a Star-Forming Filament in the 3 kpc Arm with JWST” by Savannah Gramze (U. Florida, USA) and 16 others based all around the world. This paper shows that JWST observations and ALMA Band 3 data reveal that 50-88% of CO gas in a star-forming filament is locked in ice; corrections are needed for mass measurements in such systems.

The overlay for this one is here:

You can read the final version of this one on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116968030387635232

The fifth paper of the week, also published on Thursday 23rd July but in the folder High-Energy Astrophysical Phenomena, is “Viscously Spreading Accretion Disks around Black Holes: Implications for TDEs, LFBOTs and other Transients“. This article presents a time-dependent model of accretion disks around black holes, explaining late-time emission in tidal disruption events and luminous fast blue optical transients and future detectability of such events.

The overlay for this one is here:

You can read the final version of this one on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116968076410638262

The sixth paper of this week is “Characterising the response of an International LOFAR Station” by Letizia Vincetti (Trinity Collge Dublin, Ireland) and 9 others based in Ireland, USA, The Netherlands and Sweden. This was also published on Thursday July 23rd and is in the folder Instrumentation and Methods for Astrophysics. The article presents an investigation of the performance and calibration challenges of phased-array radio interferometers, using the Irish LOFAR station as a case study, highlighting the importance of accurate beam modelling, etc.

The overlay for this one is here:

You can find the final accepted version on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116968134127626260

The seventh paper of this week is “Exo Skryer: A JAX-accelerated sub-stellar atmospheric retrieval framework” by Elspeth K.H. Lee (U. Bern, Switzerland). Published on Friday 24th July in the folder Earth and Planetary Astrophysics, this article introduces “Exo Skryer”, a new, efficient framework for exoplanet and brown dwarf atmospheric research, capable of handling large data sets and complex models.

The overlay for this one is here:

You can find the final accepted version on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116974013616759329

The (penultimate) eighth paper of this week is “GCR Spectra Reconstructed with Neutron Monitor Yield Function and Artificial Neural Networks: Comparison of Two Methods” by Stepan A. Siruk (Moscow Engineering Physics Institute MEPhI, Russia) and four others, all based in Russia. Published on Friday 24th July in the folder Instrumentation and Methods for Astrophysics, this article presents a framework using artificial neural networks and neutron monitors to reconstruct cosmic-ray energy spectra, providing data even in the absence of direct satellite observations.

The overlay for this one is here:

You can find the final accepted version on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116974048321854911

And finally for this week we have “The failed failed-supernova scenario of M31-2014-DS1” by Noam Soker (Technion, Israel), a paper which challenges the failed-supernova theory for the fading of the yellow supergiant event M31-2014-DS1, suggesting it requires unlikely parameters and supports an alternative scenario involving violent binary interaction. This was published on Friday 24th July in the folder High-Energy Astrophysical Phenomena.

The overlay for this one is here:

You can find the final accepted version on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116974082942533765

And that concludes the update of this week’s business. As it was foretold, the total number of publications at OJAp has now passed the 600 mark, and the likely number for 2026 is around 300. We published a paper in five of the six astro-ph categories this week, but still haven’t had a week when we’ve published a full house with at least one in all six…

Weekly Update from the Open Journal of Astrophysics 25/07/2026

It’s time once more for another Saturday update of activity at the Open Journal of Astrophysics. Since the last update we have published a further nine papers, bringing the number in Volume 9 (2026) to 160 and the total so far published by OJAp up to 608.

I will continue to include the posts made on our Mastodon account (on Fediscience); these announcements also show the DOI for each paper.

The first paper to report this week was published on Tuesday 21st July in the folder Cosmology and Nongalactic Astrophysics. The title is “Characterization of the Polarization Beam Response of SPT-3G Using Point Sources” by Tijmen de Haan (Institute of Particle and Nuclear Studies, Ibaraki, Japan) and an international cast of 101 others. This study presents measurements of the South Pole Telescope’s polarized beam response, indicating minimal sidelobe depolarization. The findings suggest potential explanations for frequency-dependent residuals in power spectrum analysis.

The overlay for this paper is here

You can find the officially accepted version on arXiv here and the announcement on Fediverse here:

https://fediscience.org/@OJ_Astro/116956682988048349

The second paper for this week, also published on Tuesday 21st July but in the folder Earth and Planetary Astrophysics is: “Exploring TRAPPIST-1 Climate States with an Energy Balance Model” by Jacob Haqq-Misra (Blue Marble Space, USA). The study uses a modified HEXTOR energy balance model to predict climate states of terrestrial planets orbiting low-mass stars, suggesting partial to complete ice cover for TRAPPIST-1 e and f.Abstractfor Exploring TRAPPIST-1 Climate States with an Energy Balance Model.

The overlay looks like this:

The official version of the paper can be found on arXiv here and the Fediverse announcement here:

https://fediscience.org/@OJ_Astro/116956824712105776

The third paper of the week, also published on Tuesday 21st July, but in the folder Astrophysics of Galaxies is “A first systematic study of [OIII] 88μm at z>8: two luminous oxygen lines and a powerful ionized outflow in the first 600 million years” by Hiddo Algera (Institute of Astronomy and Astrophysics, Taipei, Taiwan) and 37 others from all around the world. This paper presents deep observations of four UV-bright, gravitationally lensed galaxies, revealing an ionized outflow in one and highlighting the diagnostic power of [O III]88 μm in studying galaxies in the early Universe.

The overlay for this one is here:

The final, accepted version can be found on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116956879536002543

The fourth paper of the week, published on Thursday 23rd July in the folder Astrophysics of Galaxies, is “Mapping CO Ice in a Star-Forming Filament in the 3 kpc Arm with JWST” by Savannah Gramze (U. Florida, USA) and 16 others based all around the world. This paper shows that JWST observations and ALMA Band 3 data reveal that 50-88% of CO gas in a star-forming filament is locked in ice; corrections are needed for mass measurements in such systems.

The overlay for this one is here:

You can read the final version of this one on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116968030387635232

The fifth paper of the week, also published on Thursday 23rd July but in the folder High-Energy Astrophysical Phenomena, is “Viscously Spreading Accretion Disks around Black Holes: Implications for TDEs, LFBOTs and other Transients“. This article presents a time-dependent model of accretion disks around black holes, explaining late-time emission in tidal disruption events and luminous fast blue optical transients and future detectability of such events.

The overlay for this one is here:

You can read the final version of this one on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116968076410638262

The sixth paper of this week is “Characterising the response of an International LOFAR Station” by Letizia Vincetti (Trinity Collge Dublin, Ireland) and 9 others based in Ireland, USA, The Netherlands and Sweden. This was also published on Thursday July 23rd and is in the folder Instrumentation and Methods for Astrophysics. The article presents an investigation of the performance and calibration challenges of phased-array radio interferometers, using the Irish LOFAR station as a case study, highlighting the importance of accurate beam modelling, etc.

The overlay for this one is here:

You can find the final accepted version on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116968134127626260

The seventh paper of this week is “Exo Skryer: A JAX-accelerated sub-stellar atmospheric retrieval framework” by Elspeth K.H. Lee (U. Bern, Switzerland). Published on Friday 24th July in the folder Earth and Planetary Astrophysics, this article introduces “Exo Skryer”, a new, efficient framework for exoplanet and brown dwarf atmospheric research, capable of handling large data sets and complex models.

The overlay for this one is here:

You can find the final accepted version on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116974013616759329

The (penultimate) eighth paper of this week is “GCR Spectra Reconstructed with Neutron Monitor Yield Function and Artificial Neural Networks: Comparison of Two Methods” by Stepan A. Siruk (Moscow Engineering Physics Institute MEPhI, Russia) and four others, all based in Russia. Published on Friday 24th July in the folder Instrumentation and Methods for Astrophysics, this article presents a framework using artificial neural networks and neutron monitors to reconstruct cosmic-ray energy spectra, providing data even in the absence of direct satellite observations.

The overlay for this one is here:

You can find the final accepted version on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116974048321854911

And finally for this week we have “The failed failed-supernova scenario of M31-2014-DS1” by Noam Soker (Technion, Israel), a paper which challenges the failed-supernova theory for the fading of the yellow supergiant event M31-2014-DS1, suggesting it requires unlikely parameters and supports an alternative scenario involving violent binary interaction. This was published on Friday 24th July in the folder High-Energy Astrophysical Phenomena.

The overlay for this one is here:

You can find the final accepted version on arXiv here and the Mastodon announcement is here:

https://fediscience.org/@OJ_Astro/116974082942533765

And that concludes the update of this week’s business. As it was foretold, the total number of publications at OJAp has now passed the 600 mark, and the likely number for 2026 is around 300. We published a paper in five of the six astro-ph categories this week, but still haven’t had a week when we’ve published a full house with at least one in all six…

Astronomers Detect Possible First Exomoon — Orbiting a Brown Dwarf, Not a Planet?

https://web.brid.gy/r/https://in.mashable.com/science/112238/astronomers-detect-possible-first-exomoon-orbiting-a-brown-dwarf-not-a-planet

Astronomers Detect Possible First Exomoon — Orbiting a Brown Dwarf, Not a Planet?

https://fed.brid.gy/r/https://in.mashable.com/science/112238/astronomers-detect-possible-first-exomoon-orbiting-a-brown-dwarf-not-a-planet

Astronomers Discover Sun-like Star That Ate One of Its Planets

📰 Original title: Sun-like star caught after eating one of its own planets

🤖 IA: It's clickbait ⚠️
👥 Users: It's clickbait ⚠️

View full AI summary https://en.killbait.com/astronomers-discover-sun-like-star-that-ate-one-of-its-planets.html?utm_source=mastodon_world&utm_medium=social&utm_campaign=killbait.mastodon_world

#astronomy #planetaryengulfment #lithiumenrichment #browndwarf

#SciAM:
"
Salty clouds discovered on pink puffball planet

A cold, cherry-blossom-hued exoplanet supports bizarre clouds chock-full of salts
"
".. GJ504b might not actually be a planet at all; it’s about 25 times the mass of Jupiter,.. .. used the James Webb Space Telescope (JWST) to capture the dim light emanating from the object. .."

https://www.scientificamerican.com/article/salty-clouds-discovered-on-pink-puffball-planet/

18.6.2026

#Astronomie #astronomy #BraunerZwerg #BrownDwarf #Exoplanet #Gasriese #GJ504b #JWST #PinkPlanet #salt #Salz #Weltraumteleskop

#SciAM:
"
Salty clouds discovered on pink puffball planet

A cold, cherry-blossom-hued exoplanet supports bizarre clouds chock-full of salts
"
".. GJ504b might not actually be a planet at all; it’s about 25 times the mass of Jupiter,.. .. used the James Webb Space Telescope (JWST) to capture the dim light emanating from the object. .."

https://www.scientificamerican.com/article/salty-clouds-discovered-on-pink-puffball-planet/

18.6.2026

#Astronomie #astronomy #BraunerZwerg #BrownDwarf #Exoplanet #Gasriese #GJ504b #JWST #PinkPlanet #salt #Salz #Weltraumteleskop

#SciAM:
"
JWST catches cosmic imposters spoofing faraway galaxies
"
"The James Webb Space Telescope has found nearby brown dwarfs masquerading as far-distant galaxies. The discovery reinforces how, in astronomy, what you see isn’t always what you get"

https://www.scientificamerican.com/article/jwst-catches-cosmic-imposters-spoofing-faraway-galaxies/

19.6.2026

#Astronomie #astronomy #BraunerZwerg #BrownDwarf #BulletBD1 #BulletBD2 #JWST #RedDot #Stern #Weltraumteleskop

#SciAM:
"
JWST catches cosmic imposters spoofing faraway galaxies
"
"The James Webb Space Telescope has found nearby brown dwarfs masquerading as far-distant galaxies. The discovery reinforces how, in astronomy, what you see isn’t always what you get"

https://www.scientificamerican.com/article/jwst-catches-cosmic-imposters-spoofing-faraway-galaxies/

19.6.2026

#Astronomie #astronomy #BraunerZwerg #BrownDwarf #BulletBD1 #BulletBD2 #JWST #RedDot #Stern #Weltraumteleskop

A Test of Substellar Evolutionary Models with High-precision Ages from Asteroseismology and Gyrochronology for the Benchmark System HR 7672AB: https://iopscience.iop.org/article/10.3847/1538-4357/ae4bdb -> Astronomers Determine #BrownDwarf Age Using Tiny Stellar Pulsations: https://keckobservatory.org/hr7672/

A Test of Substellar Evolutionary Models with High-precision Ages from Asteroseismology and Gyrochronology for the Benchmark System HR 7672AB: https://iopscience.iop.org/article/10.3847/1538-4357/ae4bdb -> Astronomers Determine #BrownDwarf Age Using Tiny Stellar Pulsations: https://keckobservatory.org/hr7672/

What a Signal in a Failed Star’s Clouds Means for the Search for Life
The detection of the molecule #phosphine in a #browndwarf’s atmosphere may help #astronomers in their search for life elsewhere in the Milky Way,a molecule that on this planet is produced by living things.
This discovery is not life, the astronomers say. Any life as we know it would be impossible to sustain in such an environment.
https://www.nytimes.com/2025/10/02/science/brown-dwarf-phosphine-life.html
https://archive.ph/7nyuM

What a Signal in a Failed Star’s Clouds Means for the Search for Life
The detection of the molecule #phosphine in a #browndwarf’s atmosphere may help #astronomers in their search for life elsewhere in the Milky Way,a molecule that on this planet is produced by living things.
This discovery is not life, the astronomers say. Any life as we know it would be impossible to sustain in such an environment.
https://www.nytimes.com/2025/10/02/science/brown-dwarf-phosphine-life.html
https://archive.ph/7nyuM

Direct Imaging Explorations for Companions from the Subaru/IRD Strategic Program - Discovery of a #BrownDwarf Companion around a Nearby Mid-M-dwarf LSPM J1446+4633: https://iopscience.iop.org/article/10.3847/1538-3881/ae08b6 -> Discovery of Brown Dwarf Companion Provides New Insight into Stellar and Planetary Formation and Evolution: https://keckobservatory.org/brown-dwarf/

Direct Imaging Explorations for Companions from the Subaru/IRD Strategic Program - Discovery of a #BrownDwarf Companion around a Nearby Mid-M-dwarf LSPM J1446+4633: https://iopscience.iop.org/article/10.3847/1538-3881/ae08b6 -> Discovery of Brown Dwarf Companion Provides New Insight into Stellar and Planetary Formation and Evolution: https://keckobservatory.org/brown-dwarf/

Discovery of the Second Y+Y Dwarf Binary System, CWISEP J193518.59-154620.3: https://iopscience.iop.org/article/10.3847/2041-8213/adfee1 -> A Strange #BrownDwarf Gets Stranger: https://aasnova.org/2025/10/17/a-strange-brown-dwarf-gets-stranger/

Discovery of the Second Y+Y Dwarf Binary System, CWISEP J193518.59-154620.3: https://iopscience.iop.org/article/10.3847/2041-8213/adfee1 -> A Strange #BrownDwarf Gets Stranger: https://aasnova.org/2025/10/17/a-strange-brown-dwarf-gets-stranger/

Observation of undepleted phosphine in the atmosphere of a low-temperature brown dwarf: https://www.science.org/doi/10.1126/science.adu0401 -> The first-time finding of appreciable amounts of #phosphine in a #BrownDwarf suggests it may be too soon to use the molecule as a sign of #AlienLife: https://cen.acs.org/physical-chemistry/astrochemistry/Phosphine-found-brown-dwarfs-atmosphere/103/web/2025/10 / Phosphine, Evidence, and an Exercise in Scientific Restraint: https://www.seti.org/news/wolf-1130c-phosphine-evidence-and-an-exercise-in-scientific-restraint/

Observation of undepleted phosphine in the atmosphere of a low-temperature brown dwarf: https://www.science.org/doi/10.1126/science.adu0401 -> The first-time finding of appreciable amounts of #phosphine in a #BrownDwarf suggests it may be too soon to use the molecule as a sign of #AlienLife: https://cen.acs.org/physical-chemistry/astrochemistry/Phosphine-found-brown-dwarfs-atmosphere/103/web/2025/10 / Phosphine, Evidence, and an Exercise in Scientific Restraint: https://www.seti.org/news/wolf-1130c-phosphine-evidence-and-an-exercise-in-scientific-restraint/

#TheAccident

Gemini South Telescope Aids in Discovery of Elusive Cloud-Forming Chemical on Ancient Brown Dwarf

10-billion-year-old brown dwarf nicknamed The Accident unlocks clues to the chemistry of cloud formation on planets like Jupiter and Saturn

https://noirlab.edu/public/news/noirlab2526/

#Astronomy #Astrophysics #Astrodon #space #science #research #news #BrownDwarf #Gemeini #GeminiSouth #telescope #Jupiter #Saturn #physics

#TheAccident

Gemini South Telescope Aids in Discovery of Elusive Cloud-Forming Chemical on Ancient Brown Dwarf

10-billion-year-old brown dwarf nicknamed The Accident unlocks clues to the chemistry of cloud formation on planets like Jupiter and Saturn

https://noirlab.edu/public/news/noirlab2526/

#Astronomy #Astrophysics #Astrodon #space #science #research #news #BrownDwarf #Gemeini #GeminiSouth #telescope #Jupiter #Saturn #physics

Re-post from MinCup past:
The non-detection of #perovskite in non-stars shows that it's there.

Cool red dwarf stars have deep absorption bands from TIO gas in their atmospheres. In yet cooler brown dwarfs those bands have disappeared: opaque perovsite dust has condensed, making the titanium invisible.

Spectra from Kesseli et al. (2017), images from Gabicca, LEAP group.

#MinCup25 #Astronomy #RedDwarf #BrownDwarf #L_Dwarf #MDwarf

Re-post from MinCup past:
The non-detection of #perovskite in non-stars shows that it's there.

Cool red dwarf stars have deep absorption bands from TIO gas in their atmospheres. In yet cooler brown dwarfs those bands have disappeared: opaque perovsite dust has condensed, making the titanium invisible.

Spectra from Kesseli et al. (2017), images from Gabicca, LEAP group.

#MinCup25 #Astronomy #RedDwarf #BrownDwarf #L_Dwarf #MDwarf

Scientists Find a Quadruple Star System in Our Cosmic Backyard
First, the #astronomers identified what they believed was a lone #browndwarf orbiting a bright single #star. Further investigation revealed that the brown dwarf was actually two. After submitting a paper about the discovery, Dr. Zhang said, they realized that the bright companion was a pair of #stars, too.
“I like to call this a double-double,” said Adam Burgasser, an #astrophysicist.
https://www.nytimes.com/2025/08/25/science/quadruple-star-system.html
https://archive.ph/4CqdP

Scientists Find a Quadruple Star System in Our Cosmic Backyard
First, the #astronomers identified what they believed was a lone #browndwarf orbiting a bright single #star. Further investigation revealed that the brown dwarf was actually two. After submitting a paper about the discovery, Dr. Zhang said, they realized that the bright companion was a pair of #stars, too.
“I like to call this a double-double,” said Adam Burgasser, an #astrophysicist.
https://www.nytimes.com/2025/08/25/science/quadruple-star-system.html
https://archive.ph/4CqdP

The cool brown dwarf Gliese 229 B is a close binary / Discovery of the Binarity of Gliese 229B, and Constraints on the System's Properties: https://arxiv.org/abs/2410.11953 / https://iopscience.iop.org/article/10.3847/2041-8213/ad7714 -> Astronomers find out the first known #BrownDwarf is actually twins: https://www.astronomy.com/science/astronomers-find-out-the-first-known-brown-dwarf-is-actually-twins/ — it is a binary system of two brown dwarfs orbiting each other, in orbit around their parent red dwarf star.

The cool brown dwarf Gliese 229 B is a close binary / Discovery of the Binarity of Gliese 229B, and Constraints on the System's Properties: https://arxiv.org/abs/2410.11953 / https://iopscience.iop.org/article/10.3847/2041-8213/ad7714 -> Astronomers find out the first known #BrownDwarf is actually twins: https://www.astronomy.com/science/astronomers-find-out-the-first-known-brown-dwarf-is-actually-twins/ — it is a binary system of two brown dwarfs orbiting each other, in orbit around their parent red dwarf star.

Discovering Subsolar Metallicity #BrownDwarf Candidates in the Small Magellanic Cloud: https://iopscience.iop.org/article/10.3847/1538-4357/ad779e -> Webb finds candidates for first young brown dwarfs outside the Milky Way: https://esawebb.org/news/weic2425/

Discovering Subsolar Metallicity #BrownDwarf Candidates in the Small Magellanic Cloud: https://iopscience.iop.org/article/10.3847/1538-4357/ad779e -> Webb finds candidates for first young brown dwarfs outside the Milky Way: https://esawebb.org/news/weic2425/

The 2000s have brought a few new members to the list of closest systems to the Sun. Luhman 16 is the closest of all, at 6.51 light years, in third place behind α Centauri and Barnard's Star.

One of my favorite things is images that show the dynamic nature of the sky in contrast to the superficially "eternal heavens" we perceive. Luhman 16 gives us no less than three ways of changing, as shown here. (1/2)

Credit: ESA/Hubble & NASA, L. Bedin et al.

#space #BrownDwarf #astrophotography

#BrownDwarf

Mysterious object is travelling through space at one million miles per hour - CBBC Newsround
https://www.bbc.co.uk/newsround/articles/c623gy8wj73o.amp

#BrownDwarf

Mysterious object is travelling through space at one million miles per hour - CBBC Newsround
https://www.bbc.co.uk/newsround/articles/c623gy8wj73o.amp

Citizen Scientists Find a Star Escaping the Milky Way https://www.universetoday.com/168167/citizen-scientists-find-a-star-escaping-the-milky-way/ #backyardworlds:planet9 #citizenscienceprojects #citizenscience #browndwarf #whitedwarf #seti@home #wise

Thirteen New M Dwarf + T Dwarf Pairs Identified with WISE/NEOWISE: https://iopscience.iop.org/article/10.3847/1538-4357/ad3f1d -> #BrownDwarf and Red Dwarf Pairs Highlight a Gray Area Between Planets and Stars: https://neowise.ipac.caltech.edu/news/neowise20240723/

Thirteen New M Dwarf + T Dwarf Pairs Identified with WISE/NEOWISE: https://iopscience.iop.org/article/10.3847/1538-4357/ad3f1d -> #BrownDwarf and Red Dwarf Pairs Highlight a Gray Area Between Planets and Stars: https://neowise.ipac.caltech.edu/news/neowise20240723/

JADES - Spectroscopic Confirmation and Proper Motion for a T-Dwarf at 2 Kiloparsecs: https://arxiv.org/abs/2407.08781 -> We have spectroscopic confirmation of a cold #BrownDwarf found in JADES: https://x.com/Kevin_Hainline/status/1812898026161426925

JADES - Spectroscopic Confirmation and Proper Motion for a T-Dwarf at 2 Kiloparsecs: https://arxiv.org/abs/2407.08781 -> We have spectroscopic confirmation of a cold #BrownDwarf found in JADES: https://x.com/Kevin_Hainline/status/1812898026161426925

A fascinating and unlikely pair, perhaps doomed in the future.
Would love to watch a white dwarf devour a brown dwarf, wonder how many other stellar remnants have eaten their lesser twin and would we know?

https://www.astronomy.com/science/this-brown-dwarf-used-to-be-inside-its-white-dwarf-companion/

#WhiteDwarf #BrownDwarf #Astronomy #BinaryStars

A fascinating and unlikely pair, perhaps doomed in the future.
Would love to watch a white dwarf devour a brown dwarf, wonder how many other stellar remnants have eaten their lesser twin and would we know?

https://www.astronomy.com/science/this-brown-dwarf-used-to-be-inside-its-white-dwarf-companion/

#WhiteDwarf #BrownDwarf #Astronomy #BinaryStars

Discovery of a young low-mass #BrownDwarf transiting a fast-rotating F-type star by the Galactic Plane eXoplanet (GPX) survey: https://academic.oup.com/mnras/article/505/4/4956/6289923 -> Tilted Orbits: https://www.caltech.edu/about/news/tilted-orbits - how the orbital inclinations of brown dwarfs reveal clues about their formation.

Discovery of a young low-mass #BrownDwarf transiting a fast-rotating F-type star by the Galactic Plane eXoplanet (GPX) survey: https://academic.oup.com/mnras/article/505/4/4956/6289923 -> Tilted Orbits: https://www.caltech.edu/about/news/tilted-orbits - how the orbital inclinations of brown dwarfs reveal clues about their formation.

A JWST Survey for Planetary Mass Brown Dwarfs in IC 348: https://iopscience.iop.org/article/10.3847/1538-3881/ad00b7 -> JWST Unveils Unprecedentedly Tiny #BrownDwarf Defying Current Understanding: https://www.blog.sindibad.tn/jwst-unveilsunprecedentedly-tiny-brown-dwarf-defying-current-understanding/

A JWST Survey for Planetary Mass Brown Dwarfs in IC 348: https://iopscience.iop.org/article/10.3847/1538-3881/ad00b7 -> JWST Unveils Unprecedentedly Tiny #BrownDwarf Defying Current Understanding: https://www.blog.sindibad.tn/jwst-unveilsunprecedentedly-tiny-brown-dwarf-defying-current-understanding/

An Investigation of New #BrownDwarf Spectral Binary Candidates From the Backyard Worlds - Planet 9 Citizen Science Initiative: https://iopscience.iop.org/article/10.3847/1538-3881/acffc1 -> Two-for-One, Three Times - New Candidate Brown Dwarf Binaries: https://aasnova.org/2023/11/20/two-for-one-three-times-new-candidate-brown-dwarf-binaries/

An Investigation of New #BrownDwarf Spectral Binary Candidates From the Backyard Worlds - Planet 9 Citizen Science Initiative: https://iopscience.iop.org/article/10.3847/1538-3881/acffc1 -> Two-for-One, Three Times - New Candidate Brown Dwarf Binaries: https://aasnova.org/2023/11/20/two-for-one-three-times-new-candidate-brown-dwarf-binaries/

The non-detection of #perovskite in non-stars shows that it's there.

Cool red dwarf stars have deep absorption bands from TIO gas in their atmospheres. In yet cooler brown dwarfs those bands have disappeared: opaque perovsite dust has condensed, making the titanium invisible.

Spectra from Kesseli et al. (2017), images from Gabicca, LEAP group.
#MinCup24 #Astronomy #RedDwarf #BrownDwarf #L_Dwarf

The non-detection of #perovskite in non-stars shows that it's there.

Cool red dwarf stars have deep absorption bands from TIO gas in their atmospheres. In yet cooler brown dwarfs those bands have disappeared: opaque perovsite dust has condensed, making the titanium invisible.

Spectra from Kesseli et al. (2017), images from Gabicca, LEAP group.
#MinCup24 #Astronomy #RedDwarf #BrownDwarf #L_Dwarf

JWST Accidentally Found 21 Brown Dwarfs

JWST is the most powerful telescope ever built by humanity, and it's scanning into the very limits of the observable Universe to see the first galaxies coming together. However, as part of several galactic surveys, astronomers have already identified 21 brown dwarf candidates in the data, much closer to home. Some are as close as around 325 light-years, others as far as 13,700 light-years - farther than any brown dwarfs discovered. Quite a handy side-benefit.

#jwst #browndwarf

https://www.universetoday.com/163106/jwst-accidentally-found-21-brown-dwarfs/

JWST Accidentally Found 21 Brown Dwarfs

JWST is the most powerful telescope ever built by humanity, and it's scanning into the very limits of the observable Universe to see the first galaxies coming together. However, as part of several galactic surveys, astronomers have already identified 21 brown dwarf candidates in the data, much closer to home. Some are as close as around 325 light-years, others as far as 13,700 light-years - farther than any brown dwarfs discovered. Quite a handy side-benefit.

#jwst #browndwarf

http://arxiv.org/abs/2309.03250

JWST Accidentally Found 21 Brown Dwarfs

JWST is the most powerful telescope ever built by humanity, and it's scanning into the very limits of the observable Universe to see the first galaxies coming together. However, as part of several galactic surveys, astronomers have already identified 21 brown dwarf candidates in the data, much closer to home. Some are as close as around 325 light-years, others as far as 13,700 light-years - farther than any brown dwarfs discovered. Quite a handy side-benefit.

#jwst #browndwarf

http://arxiv.org/abs/2309.03250

Cold Brown Dwarf Emits Strange Periodic Radio Signals We Can't Explain - YouTube
https://www.youtube.com/watch?v=ZatVGtXC9Iw

#Astronomy #Cosmology #BrownDwarf

Cold Brown Dwarf Emits Strange Periodic Radio Signals We Can't Explain - YouTube
https://www.youtube.com/watch?v=ZatVGtXC9Iw

#Astronomy #Cosmology #BrownDwarf

A transiting #BrownDwarf in a 2 hour orbit: https://arxiv.org/abs/2307.15729 -> "We infer a BD mass of MBD=80.1±1.6MJ [...] Today, the entire binary would comfortably fit inside the Sun. However, both components must have been considerably larger in youth, implying that the orbit has shrunk by at least a factor of ∼5 since formation. The simplest explanation is that magnetic braking continues to operate efficiently in at least some low-mass stars and BDs."

A transiting #BrownDwarf in a 2 hour orbit: https://arxiv.org/abs/2307.15729 -> "We infer a BD mass of MBD=80.1±1.6MJ [...] Today, the entire binary would comfortably fit inside the Sun. However, both components must have been considerably larger in youth, implying that the orbit has shrunk by at least a factor of ∼5 since formation. The simplest explanation is that magnetic braking continues to operate efficiently in at least some low-mass stars and BDs."

Never Before Seen Brown Dwarf Binary Found By JWST - YouTube
https://www.youtube.com/watch?v=s1blDSD3giU

#Astronomy #Cosmology #BrownDwarf