Exoplanètes habitables

Les exoplanètes habitables orbitent dans la zone habitable de leur étoile, où l'eau liquide peut exister. La distance détermine la température : comme dans notre système solaire, Mercure est brûlante, Mars est glaciale et la Terre est idéalement située. L'eau liquide exige des températures entre 0 et 100 °C sous une pression adéquate. La composition chimique est essentielle : la planète doit avoir une surface rocheuse et une atmosphère riche en carbone, hydrogène, oxygène et azote, briques de la vie.

Latest news from Exoplanètes habitables

Variable X-ray radiation likely drives helium escape from exoplanet LHS 1140 b

29. 9. 2026

Étoiles | Exoplanètes | Exoplanètes habitable

Image: Variable X-ray radiation likely drives helium escape from exoplanet LHS 1140 b

LHS 1140 b is a rocky planet orbiting within the habitable zone of a Red dwarf star. Previous observations detected helium escaping from the planet as it transited, or passed in front of, its host star. Because stars emit high-energy radiation that can strip away planetary atmospheres, researchers analyzed whether fluctuations in the star's X-ray and ultraviolet output could explain the changing levels of escaping helium. Using the XMM-Newton space telescope, observers monitored the system fo...

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Escaping helium atmosphere identified on the rocky exoplanet LHS 1140b

1. 8. 2026

Étoiles | Exoplanètes | Atmosphères planétaires | Exoplanètes habitable

Image: Escaping helium atmosphere identified on the rocky exoplanet LHS 1140b

Spectroscopic observations reveal helium escaping from the atmosphere of rocky exoplanet LHS 1140b. Data from 2024 and 2025 show this process is time-variable, suggesting an atmosphere depleted of hydrogen. No such escape was detected on the companion planet LHS 1140c....

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HD 20794 d: a stable, eccentric planet crossing the habitable zone

27. 5. 2026

Étoiles | Exoplanètes | Exoplanètes habitable

Image: HD 20794 d: a stable, eccentric planet crossing the habitable zone

HD 20794 d, a low-mass planet on an eccentric orbit, crosses its star’s habitable zone and remains dynamically stable. Its unique path makes it a top target for habitability studies....

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Gliese 3378b’s new mass and orbit place it near the cosmic shoreline

20. 5. 2026

Étoiles | Exoplanètes | Super-Terre | Exoplanètes habitable

Image: Gliese 3378b’s new mass and orbit place it near the cosmic shoreline

Gliese 3378b, a super-Earth orbiting a nearby red dwarf, is lighter and closer to its star than previously thought. It sits in the habitable zone, near the cosmic shoreline where atmospheres may be lost....

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TOI-1752 hosts a lava world and a sub-Neptune in the habitable zone

21. 4. 2026

Étoiles | Exoplanètes | TESS | Exoplanètes habitables | Planètes de lave

Image: TOI-1752 hosts a lava world and a sub-Neptune in the habitable zone

TOI-1752 is confirmed to host a lava world and a sub-Neptune in the habitable zone. This system is a prime target for studying planetary diversity and potential habitability....

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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

	TOI 561 276 ly			Evolutionary pathways toward survival of a thick CO2- or SO2-rich atmosphere on the lava world TOI-561 b 5. 9. 2026
	TOI-1752 337 ly			A gem system with a lava world and a habitable zone sub-Neptune orbiting TOI-1752 21. 4. 2026
	K2-141 202 ly			Mantle convection and nightside volcanism on lava world K2-141 b 4. 3. 2026
	L 98-59 34.6 ly			Self-limited tidal heating and prolonged magma oceans in the L 98-59 system 7. 5. 2025
	TRAPPIST-1 40.7 ly			From CO2- to H2O-dominated atmospheres and back -- How mixed outgassing changes the volatile distribution in magma oceans around M dwarf stars 16. 12. 2024

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Exoplanètes habitables

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