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Stellar Brief: 21. 10. 2026
Tau Ceti remains a high-interest target for enthusiasts, with new research exploring how volatile substances behave within planetary interiors. Understanding these processes is key to decoding the complex evolution of worlds far beyond our own solar system. Read today's Stellar Brief

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Latest astronomy nouvelles

New warm Neptune discovered orbiting nearby red dwarf TOI 2015
icon18. 10. 2023 (accepté)
iconÉtoiles | TESS | Exoplanète
Image: New warm Neptune discovered orbiting nearby red dwarf TOI 2015
The planet has more than 3 Earth radii and a 16 Earth masses, suggesting a likely volatile-rich planet. Transit timing variations in the system suggest the presence of an outer planet candidate near a 2:1 resonance, with a mass of 6.8 Earths. Further observations are needed to explicitly identify the resonance and further characterize the properties of the system....
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Exoplanets similar to Neptune have cloudy atmospheres and high metalicity
icon11. 10. 2023 (accepté)
iconÉtoiles | Exoplanète
Image: Exoplanets similar to Neptune have cloudy atmospheres and high metalicity
A new analysis of exo-Neptune transmission spectra reveals that these planets have very cloudy atmospheres and high metallicity. Colder exo-Neptunes may have clearer atmospheres, making them better targets for future studies and the search for life beyond Earth...
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2 exoplanets discovered orbiting red dwarfs Gliese 724 and Gliese 3988
icon9. 10. 2023 (accepté)
iconÉtoiles | Exoplanète
Image: 2 exoplanets discovered orbiting red dwarfs Gliese 724 and Gliese 3988
Both planets have short periods and relatively low masses, but Gliese 724 b is the most eccentric single exoplanet yet discovered around an M dwarf....
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The most promising ways to confirm Gaia astrometric planetary candidates and obtain follow-up data
icon9. 10. 2023 (accepté)
iconÉtoiles | Exoplanètes | Naines blanche
Image: The most promising ways to confirm Gaia astrometric planetary candidates and obtain follow-up data
Astrometric planet candidates around white dwarfs can be confirmed and characterized by combining astrometric data with spectroscopic and photometric data. Radial velocity and infrared photometry can be used to probe the mass of the objects producing some of the astrometric signals, and rule out parts of the brown dwarf and planet mass parameter space....
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Exomoon signal in the Kepler 1513 system might be caused by a second exoplanet
icon5. 10. 2023 (accepté)
iconÉtoiles | Exoplanètes | Kepler | Exolune
Image: Exomoon signal in the Kepler 1513 system might be caused by a second exoplanet
Exoplanet Kepler 1513 b was discovered in 2016. Observed transit timing variations were thought to be originating in planet-moon interaction. New observations show that better explanation for the variations is an existence of a second, non-transiting planet in the system....
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Stellar companions can affect planet formation
icon5. 10. 2023 (accepté)
iconÉtoile
Image: Stellar companions can affect planet formation
Study of 66 stars with planets and planet candidates found that those with stellar companions have more false positive planet detections and shorter orbital periods for their planets. This suggests that stellar companions can truncate planet-forming disks and affect planet formation....
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JWST found heavy elements in atmosphere of exoplanet HD 209458 b
icon5. 10. 2023 (accepté)
iconÉtoile
Image: JWST found heavy elements in atmosphere of exoplanet HD 209458 b
JWST has observed the atmosphere of HD 209458b, a hot Jupiter exoplanet. The observations reveal that the planet has a super-solar metallicity and a very low C/O ratio, suggesting that it has undergone significant contamination by evaporating planetesimals while migrating inward....
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Habitable zone stability probed within the HD 141399 system with 4 giant exoplanets
icon2. 10. 2023 (accepté)
iconÉtoile
Image: Habitable zone stability probed within the HD 141399 system with 4 giant exoplanets
K-dwarf star HD 141399 is about 120 light years away and there are 4 known exoplanets orbiting it. All of them are gas giants similar to Jupiter and one is suspected to reside in the habitable zone of the star....
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Two Saturn-like exoplanets orbit a Sun-like star TOI 199
icon26. 9. 2023 (accepté)
iconÉtoiles | Exoplanètes | TESS
Image: Two Saturn-like exoplanets orbit a Sun-like star TOI 199
The planet closer to the star is the first warm exo-Saturn with a precisely determined mass and radius...
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New study shows a brown dwarf HD 106906 B that formed like a star, rather than planet
icon18. 9. 2023 (accepté)
iconÉtoile
Image: New study shows a brown dwarf HD 106906 B that formed like a star, rather than planet
Astronomers have studied the atmosphere of a newly discovered planet-mass companion to a young star. They find that its carbon-to-oxygen ratio is consistent with it forming like a star, rather than like a planet....
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Exoplanètes nouvellement découvertes

 EK Chamaeleontis b 10 / 2026 2702.2 M⊕ 321.3 ly
HD 715 b 10 / 2026 201.9 M⊕ 542.8 ly
DENIS J1253-5709 b 10 / 2026 244.8 M⊕ 54.4 ly
TOI-6417 b 09 / 2026 349.7 M⊕ 1903.9 ly
TOI-6443 b 09 / 2026 1605.4 M⊕ 2051.6 ly
TOI-7219 b 09 / 2026 661 M⊕ 1074.2 ly
TOI-4079 B b 09 / 2026 1646.8 M⊕ 1185.6 ly
HD 45652 b 09 / 2026 1557.7 M⊕ 113.9 ly
LSPM J0804+1116 b 09 / 2026 6.4 M⊕ 82.6 ly
HR 8799 f 09 / 2026 524.5 M⊕ 133.3 ly
61 Cygni A b 09 / 2026 2543.3 M⊕ 11.4 ly
TOI-5646 b 08 / 2026 45.9 M⊕ 1352.3 ly
TOI-4468 c 08 / 2026 11.1 M⊕ 1233.1 ly
TOI-4468 b 08 / 2026 170.1 M⊕ 1233.1 ly
TOI-4468 d 08 / 2026 311 M⊕ 1233.1 ly
Newly discovered exoplanets
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Latest scientific studies

Parcourez les dernières études scientifiques sur les étoiles et les exoplanètes de notre galaxie. Découvrez les dernières recherches en astrophysique et en astronomie stellaire.

 TOI 431
106 ly
 study icon Thermal Evolution of Lava Planets Across System Ages: Predictions for Hell of a Survey
today

L 115-21
41.9 ly
 study icon A sub-Earth-sized TESS planet candidate in the nearby M-dwarf binary GJ 774, most likely orbiting GJ 774 A (TIC 351339274)
today

TOI-3686
841 ly
 study icon TOI-3686: A Hot Jupiter and Sub-Neptune In A 2:1 Mean-Motion Resonance
today

TOI-270
73.3 ly
 study icon Ammonia-Hydrogen Phase Equilibria in Planetary Envelopes from First-Principles-Based Machine-Learning Molecular Dynamics
today

PDS 70
370 ly
 study icon Kinematic structure and age of a Scorpius--Centaurus subcomponent: implications for PDS 70 planetary system
yesterday

TIC 402710280
218 ly
 study icon A 36.34-day Sub-Neptune Candidate Transiting the Nearby K Dwarf TIC 402710280
yesterday

LTT 9779
264 ly
 +1 study icon Granulation in Color: The Chromatic Stellar Flicker of LTT-9779 and WASP-121
yesterday

HD 112485
5881 ly
 study icon Ensemble pulsational characteristics of eclipsing binaries containing β Cep stars observed by the TESS mission
19. 10. 2026

HD 100546
359 ly
 study icon An ALMA view on molecular complexity: water, methanol, and methyl formate in the HD 100546 and IRS 48 disks
19. 10. 2026

HD 120678
5829 ly
 study icon HD 120678: a classical Be star with a tilting heartbeat disk
18. 10. 2026
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