Une paire de planètes inhabituelle remet en cause les modèles de formation traditionnels

7 mai 2026

Rapporté par l'IA

Des astronomes ont identifié un système planétaire rare situé à 190 années-lumière de la Terre, composé d'un Jupiter chaud partageant son orbite avec une mini-Neptune plus proche de l'étoile. Cette configuration était autrefois considérée comme quasi impossible. De nouvelles observations du télescope spatial James Webb apportent un éclairage nouveau sur la manière dont ces planètes se sont formées.

Le système, centré sur l'étoile TOI-1130, a été détecté pour la première fois en 2020 grâce aux données du satellite Transiting Exoplanet Survey Satellite de la NASA. La mini-Neptune boucle une orbite en quatre jours, tandis que le Jupiter chaud en prend huit. Les chercheurs ont noté que les Jupiters chauds sont généralement dépourvus de compagnons à proximité en raison de leur forte influence gravitationnelle.

Articles connexes

Scientists discover unusual inside-out planetary system

Astronomers have found a planetary system around a red dwarf star where a rocky world orbits beyond two gas giants, challenging standard models of how planets form. The discovery around LHS 1903 suggests planets may arise sequentially rather than all at once.

JWST uncovers metal-poor atmosphere on exoplanet TOI-5205 b

8 avril 2026 Rapporté par l'IA

Astronomers using the James Webb Space Telescope have detected an unusually metal-poor atmosphere on the Jupiter-sized exoplanet TOI-5205 b, which orbits a small, cool star. The planet's atmospheric metallicity is lower than that of its host star, challenging theories of giant planet formation. The findings come from a study led by researchers at NASA's Goddard Space Flight Center and Carnegie Science.

Technology

JWST maps distinct weather on distant hot gas giant

Science

James Webb Space Telescope finds differing twilights on exoplanet

Science

Scientists identify ancient planet factory beyond Jupiter

JWST discovers water ice clouds on Jupiter-like exoplanet

Astronomers using the James Webb Space Telescope have detected thick water ice clouds on Epsilon Indi Ab, a cold gas giant resembling Jupiter. The finding, led by researchers at the Max Planck Institute for Astronomy, reveals less ammonia than expected in the planet's atmosphere. This challenges existing models and advances techniques for studying distant worlds.

Hubble captures giant chaotic planet-forming disk

12 mai 2026 Rapporté par l'IA

NASA's Hubble Space Telescope has imaged the largest known protoplanetary disk, revealing a turbulent and asymmetric structure around a young star. The disk, nicknamed Dracula's Chivito, stretches nearly 400 billion miles across and lies about 1,000 light-years from Earth.

samedi 13 juin 2026 23h50

Une paire de planètes inhabituelle remet en cause les modèles de formation traditionnels

Articles connexes

Scientists discover unusual inside-out planetary system

JWST uncovers metal-poor atmosphere on exoplanet TOI-5205 b

JWST maps distinct weather on distant hot gas giant

James Webb Space Telescope finds differing twilights on exoplanet

Scientists identify ancient planet factory beyond Jupiter

JWST discovers water ice clouds on Jupiter-like exoplanet

Hubble captures giant chaotic planet-forming disk

Giant planets spin faster than brown dwarfs in new study

James Webb telescope finds temperate giant planet with methane

Japanese astronomers detect thin atmosphere on small trans-Neptunian object 2002 XV93

AI tool RAVEN confirms over 100 exoplanets in NASA TESS data

Astronomers identify 10,000 new exoplanet candidates in TESS data

Einstein's relativity explains scarcity of two-sun planets

Dying stars devour nearby giant planets, astronomers find

Ce site utilise des cookies