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Exoplanètes

Exoplanètes

Les exoplanètes sont des mondes en orbite autour d'autres étoiles, tout comme la Terre orbite autour du Soleil. Alors que notre système solaire compte huit planètes liées à une étoile centrale, les exoplanètes étendent ce concept à l'univers entier. Il peut s'agir de géantes gazeuses comme Jupiter ou de mondes rocheux semblables à la Terre. Les astronomes en ont découvert des milliers, et chaque étoile dans le ciel nocturne pourrait être un "Soleil" potentiel pour ses propres satellites. Ces corps nous aident à comprendre si notre agencement planétaire est commun ou unique.

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JWST images reveal CO2 and high metallicity in super-Jupiter 29 Cyg b, hinting at disk formation

Étoiles | Exoplanètes | Télescope spatial James Webb | Atmosphères planétaire

Image: JWST images reveal CO2 and high metallicity in super-Jupiter 29 Cyg b, hinting at disk formation

29 Cyg b is a massive companion to the star 29 Cygni, with a mass near the boundary between giant planets and brown dwarfs. Using the James Webb Space Telescope, astronomers directly imaged the planet and detected strong absorption from carbon monoxide and carbon dioxide in its atmosphere. The strength of the CO2 feature compared to CO indicates that 29 Cyg b is enriched in heavy elements, or metals, relative to its host star. This enhanced metallicity suggests that 29 Cyg b likely formed wit...

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Hidden companion may explain GJ 436 b's polar, eccentric orbit

Étoiles | Exoplanète

Image: Hidden companion may explain GJ 436 b

A hidden companion may explain GJ 436 b's rare polar, eccentric orbit. New analysis sets strong limits on possible perturbers and shows how distant objects can shape planetary systems....

Modeling shows Gliese 486 b's water content depends on its early hydrogen-rich atmosphere

Étoiles | Exoplanète

Image: Modeling shows Gliese 486 b

Modeling shows GJ 486b's current water content depends on how much hydrogen-rich atmosphere it had early on. Even a small hydrogen envelope could have helped the planet keep its water....

Two candidate planets found around Sun-like star HD 161098 in the sub-meter-per-second era

Étoiles | Exoplanètes | Étoiles de type solaire

Image: Two candidate planets found around Sun-like star HD 161098 in the sub-meter-per-second era

Two candidate planets have been detected around the Sun-like star HD 161098, including one in the habitable zone. Advanced techniques reveal tiny signals, marking progress in the search for Earth-like worlds....

HD 25295 b confirmed as a hot sub-Neptune and prime target for future atmospheric studies

Étoiles | Exoplanètes | Atmosphères planétaire

Image: HD 25295 b confirmed as a hot sub-Neptune and prime target for future atmospheric studies

TOI-4602 b is confirmed as a hot sub-Neptune orbiting a bright, quiet star. Its size and mass make it a prime target for JWST and Ariel to study how small planets lose their atmospheres....

Research in Atmosphères planétaires

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

Les recherches en cours

	HIP 99770 133 ly			Direct Images of CO2 Absorption in the Atmosphere of a Super-Jupiter: Enhanced Metallicity Suggestive of Formation in a Disk 14. 4. 2026
	HD 25295 205 ly			The GAPS Programme at TNG. LXXIII. Confirmation of the hot sub-Neptune TOI-4602 b (HD 25295 b), a key target for future atmospheric characterization 14. 4. 2026
	Gliese 3473 89.1 ly			Hot Rocks Survey V: Secondary Eclipse Photometry of GJ 3473 b with JWST/MIRI 6. 4. 2026
	K2-18 124 ly			The atmosphere of K2-18 b: The role of hazes, clouds and photoelectrons 30. 3. 2026
	NGTS-2 1175 ly			BOWIE-ALIGN: Exploring degeneracies in the muted transmission spectrum of the aligned hot Jupiter NGTS-2b with NIRSpec/G395H 20. 3. 2026

Publications plus anciennes

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