#exoplanet — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #exoplanet, aggregated by home.social.
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White Paper Makes the Case for a European Exoplanet Interferometer
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RE: https://mastodon.social/@proseandpassion/116935425709917770
Where in #space can #planets with #atmospheres be found? C. Cherubim et al. (2026) used #nearinfraredspectroscopy to characterize a #rocky #exoplanet orbiting its host star within the #habitablezone. Planet #LHS1140b exhibits #helium #absorption in its atmosphere, a feature the authors attribute to a helium-dominated #upperatmosphericlayer.
© #StefanFWirth, July 2026, Berlin
Reference
C. Cherubim et al. (2026)
https://doi.org/10.1126/science.aea9708 -
The cosmic shoreline concept was introduced to separate #planets with #atmospheres from those without, by relating the cumulative X-ray and extreme-ultraviolet (XUV) instellation to the planetary escape velocity, using the Solar System planets to anchor the empirical relation.
The #exoplanet community has since attempted to refine the cosmic shoreline to provide a consistent ranking or prioritisation tool for exoplanet observations – i.e., to quickly identify which small #planets are most likely to have retained an #atmosphere.
In a new paper, astronomers use an empirical approach to refine the cosmic shoreline concept.
The Empirical Exoplanet Cosmic Shoreline (EECS) exhibits a significantly steeper slope than previously theorized, while consistently categorising Solar System moons and dwarf planets according to their atmospheric properties.
Applied to planets orbiting M dwarfs, the EECS suggests that a larger fraction retain atmospheres than predicted by classical models, but incorporating revised XUV fluence histories for low-mass M dwarfs reveals severe atmospheric vulnerability.
#astronomy #astrobiology
https://astrobiology.com/2026/06/an-empirical-determination-of-the-cosmic-shoreline-2.htmlPaper by Meni-Gallardo & Pallé (2026):
https://arxiv.org/abs/2508.12865 -
The Ring Current in Earth's Magnetosphere ✨
#AllSkyImaging #Ast #Astrophysics #Exoplanet #Galaxy #Magnetosphere #RingCurrent #Space
⏩ 2 new pictures and 1 new video from NASA (SVS) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=10&user=OptimusPrimeBot&ilshowall=1&offset=20260514125724
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Here is a problem that has been quietly gnawing at astronomers for decades.
The standard approach to detecting #life on other worlds involves scanning #exoplanet #atmospheres for #oxygen, #methane, and #ozone, whose presence is difficult to explain without #biology.
It's a clever idea, but it carries a hidden flaw. That entire shopping list was written by studying Earth. It is, inevitably, a search for life like us.
The list of ways that #chemistry alone can accidentally mimic these #biosignature gases is growing faster than the list of new ways to detect life.
Each new false positive scenario demands even more information about the #planet to rule it out, and there is a genuine question about whether that information can ever be gathered exhaustively.
But there is a solution.
#Assembly theory doesn't ask what #molecules are present in an #atmosphere. Instead, it asks how hard they were to make.
Every molecule can be assigned an assembly index, a minimum number of construction steps required to build it from basic #chemical building blocks.
Simple molecules are easy to assemble by chance, but truly complex ones, requiring many sequential steps, don't arise without something doing a great deal of deliberate selection.
That something would then be life itself.
#astrobiology #astronomy
https://phys.org/news/2026-03-life.htmlPaper by Walker et al. (2026): https://arxiv.org/abs/2603.11086
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Vierer-Planetensystem trotzt den Regeln. Außen kreisender, massiver Gesteinsplanet passt nicht zu gängigen Bildungsszenarien. #Exoplanet #Planetensystem #Planetenbildung #Astronomie
https://www.scinexx.de/news/kosmos/vierer-planetensystem-trotzt-den-regeln/ -
Viewing an Exoplanet Transmission Spectrum 🛰️
#Exoplanet #ExoplanetAtmospheres #Fleet #Heliopause #Heliophysics #Heliosphere #Magnetopause #Magnetosphere
⏩ 3 new pictures and 3 new videos from NASA (SVS) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=22&user=OptimusPrimeBot&ilshowall=1&offset=20260128125704
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We live in a very exciting time: answers to some of the oldest questions humanity has conceived are within our grasp.
One of these is whether #Earth is the only place that harbours #life.
In the last 30 years, the question of whether the Sun is unique in hosting a planetary system has been resoundingly answered: we now know of thousands of #exoplanets orbiting other #stars.
But can we use telescopes to detect whether any of these distant worlds also harbour life?
A promising method is to analyse the gases present in the #atmospheres of these #planets.
Astonishingly, we can identify #molecules present in the atmospheres of exoplanets.
Quantum mechanics causes each atmospheric chemical to have its own distinct barcode-like pattern, which it leaves on the light passing through it.
By collecting starlight that has been filtered through an #exoplanet’s atmosphere, telescopes can see the barcodes of the molecules making up that atmosphere.
To take advantage of this, the planet needs to #transit – pass in front of – the star from our point of view.
#astronomy #astrobiology
https://theconversation.com/how-astronomers-plan-to-detect-the-signatures-of-alien-life-in-the-atmospheres-of-distant-planets-272821 -
#MPIA:
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Trümmerscheiben-Galerie erlaubt Rückschlüsse auf Staub und Kleinkörper in fernen PlanetensystemenBilder von Staub in der Umgebung ferner Exoplaneten liefern Informationen zu Asteroiden und Kometen in anderen Sonnensystemen
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https://www.mpia.de/aktuelles/wissenschaft/2025-07-sphere3.12.2025
#Asteroidengürtel #Astronomie #ESO #Exoplanet #Himmelskörper #Komet #Kuipergürtel #Planetesimal #Staub #SPHERE #Trümmerscheibe #VLT
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Ein Protoplanet schafft sich Platz. Erster Nachweis eines Jungplaneten in der Staubscheiben-Lücke eines sonnenähnlichen Sterns. #Protoplanet #Exoplanet #Astronomie #VLT #WISPIT2 #Planetenbildung
https://www.scinexx.de/news/kosmos/ein-protoplanet-schafft-sich-platz/ -
Gasriese ist zu groß für seinen Stern. Großer Exoplanet um massearmem Zwergstern wirft Fragen zur Planetenbildung auf. #Astronomie #Exoplanet #TOI6894b #Gasriese #Planetenbildung
https://www.scinexx.de/news/kosmos/gasriese-ist-zu-gross-fuer-seinen-stern/ -
Astronomen entdecken jüngsten Transit-Planet. Glücklicher Zufall enthüllt erst drei Millionen Jahre altes Jungendstadium einer Supererde. #Exoplanet #Jungplanet #Planetentransit #Astronomie #Planetenbildung
https://www.scinexx.de/news/kosmos/astronomen-entdecken-juengsten-transit-planet/ -
Exoplanet ist dichter als die Theorie erlaubt. Neptungroßer Planet ist dichter als Stahl und viel zu schwer für seine Größe. #Exoplanet #Planet #Astronomie #TOI1853b #Planetenbildung
https://www.scinexx.de/news/kosmos/exoplanet-ist-dichter-als-die-theorie-erlaubt/ -
Exoplanet ist dichter als die Theorie erlaubt. Neptungroßer Planet ist dichter als Stahl und viel zu schwer für seine Größe. #Exoplanet #Planet #Astronomie #TOI1853b #Planetenbildung
https://www.scinexx.de/news/kosmos/exoplanet-ist-dichter-als-die-theorie-erlaubt/ -
Exoplanet ist dichter als die Theorie erlaubt. Neptungroßer Planet ist dichter als Stahl und viel zu schwer für seine Größe. #Exoplanet #Planet #Astronomie #TOI1853b #Planetenbildung
https://www.scinexx.de/news/kosmos/exoplanet-ist-dichter-als-die-theorie-erlaubt/ -
Exoplanet ist dichter als die Theorie erlaubt. Neptungroßer Planet ist dichter als Stahl und viel zu schwer für seine Größe. #Exoplanet #Planet #Astronomie #TOI1853b #Planetenbildung
https://www.scinexx.de/news/kosmos/exoplanet-ist-dichter-als-die-theorie-erlaubt/ -
Two possible pathways for the formation of TOI-1853 b, an exoplanet found in the middle of the Neptunian desert asking for a scenario of its formation and evolution.
https://nature.com/articles/s41586-023-06499-2
#universe #astronomy #astrophysics #astrodon #planet #planets #exoplanet #exoplanets #hotneptune #tess #toi1853b
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Two possible pathways for the formation of TOI-1853 b, an exoplanet found in the middle of the Neptunian desert asking for a scenario of its formation and evolution.
https://nature.com/articles/s41586-023-06499-2
#universe #astronomy #astrophysics #astrodon #planet #planets #exoplanet #exoplanets #hotneptune #tess #toi1853b
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Two possible pathways for the formation of TOI-1853 b, an exoplanet found in the middle of the Neptunian desert asking for a scenario of its formation and evolution.
https://nature.com/articles/s41586-023-06499-2
#universe #astronomy #astrophysics #astrodon #planet #planets #exoplanet #exoplanets #hotneptune #tess #toi1853b
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Two possible pathways for the formation of TOI-1853 b, an exoplanet found in the middle of the Neptunian desert asking for a scenario of its formation and evolution.
https://nature.com/articles/s41586-023-06499-2
#universe #astronomy #astrophysics #astrodon #planet #planets #exoplanet #exoplanets #hotneptune #tess #toi1853b
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Two possible pathways for the formation of TOI-1853 b, an exoplanet found in the middle of the Neptunian desert asking for a scenario of its formation and evolution.
https://nature.com/articles/s41586-023-06499-2
#universe #astronomy #astrophysics #astrodon #planet #planets #exoplanet #exoplanets #hotneptune #tess #toi1853b
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"Meilenstein für #Weltraumteleskop #JWST: bessere Exoplaneten-Atmosphären-Beobachtungen als je zuvor" "Beobachtungen des #Exoplanet.. #WASP39b mit dem James-Webb-Weltraumteleskop (#JWST) haben eine Fülle von Informationen über die Atmosphäre des Planeten geliefert. Eine Pressemitteilung des Max-Planck-Instituts für #Astronomie.": https://www.raumfahrer.net/meilenstein-fuer-weltraumteleskop-jwst-bessere-exoplaneten-atmosphaeren-beobachtungen-als-je-zuvor/ #MPIA #NIRCam #NIRISS #NIRSpec #Schwefeldioxid #Schwefelwasserstoff #Transitmethode