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Jupiter chaud
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Jupiter chaud

Un Jupiter chaud est une planète géante gazeuse similaire à notre Jupiter, mais avec une différence majeure : elle orbite très près de son étoile. Alors que notre Jupiter met 12 ans pour faire le tour du Soleil, ces mondes exotiques terminent leur « année » en quelques jours seulement. À cause de la chaleur intense, leur atmosphère gonfle comme une montgolfière, ce qui les rend peu denses et « bouffis ». Rien de tel n'existe dans notre système solaire, où seules de petites planètes rocheuses gravitent près du Soleil.
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Latest news from Jupiter chaud

WASP-33 b and other hot Jupiters identified as prime targets for structural studies
iconToday
iconÉtoiles | Exoplanètes | Jupiter chaud | Télescope spatial James Webb
Image: WASP-33 b and other hot Jupiters identified as prime targets for structural studies
The physical shape of a giant planet orbiting close to its star offers a unique window into its internal composition. Intense gravitational pull from the host star stretches these planets, causing measurable deformations. These distortions are calculated using a value called the fluid Love number, which describes how a planet responds to external gravitational stress. By measuring this number, researchers can better understand how matter is distributed deep within a planet and test different mod...
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Thick-disk stars identified as hosts to ancient hot jupiter planets
iconToday
iconÉtoiles | Exoplanètes | Étoiles de type solaire | Jupiter chaud | Formation des planète
Image: Thick-disk stars identified as hosts to ancient hot jupiter planets
New analysis of 268 stars identifies several hot Jupiters orbiting ancient stars in the Milky Way's thick disk. These systems, over 8 billion years old, show distinct differences in mass and orbital periods compared to younger thin-disk populations....
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Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
iconYesterday
iconÉtoiles | Exoplanètes | Jupiter chaud | Atmosphères planétaire
Image: Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
New observations of hot Jupiter KELT-2A b confirm water vapor in its atmosphere. The planet shows a carbon-to-oxygen ratio similar to its host star but with overall lower metallicity, suggesting a complex migration history from far out in its star system....
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Periodic transit timing variations measured for Neptune-like planet HAT-P-18 b
iconYesterday
iconÉtoiles | Exoplanètes | Super-Terre | Jupiter chaud | Télescope spatial James Webb
Image: Periodic transit timing variations measured for Neptune-like planet HAT-P-18 b
New observations from the James Webb Space Telescope show periodic transit timing variations in the Neptune-like planet HAT-P-18 b. The data indicates an orbital timing shift of 92.9 seconds, providing fresh insights into the dynamics of this distant system....
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Escaping atmosphere of the ultrahot Jupiter KELT-18 b reveals metastable helium
icon14. 10. 2026
iconÉtoiles | Exoplanètes | Jupiter chaud | Atmosphères planétaire
Image: Escaping atmosphere of the ultrahot Jupiter KELT-18 b reveals metastable helium
Researchers have detected metastable helium escaping from the ultrahot Jupiter KELT-18 b. This confirms the massive gas giant is undergoing active atmospheric photoevaporation. KELT-18 b is now the most massive planet found with this specific helium signature....
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