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Latest astronomy nouvelles
Restez informé(e) des dernières actualités astronomiques, des découvertes sur les étoiles et les exoplanètes, et des recherches en cours. Découvrez de nouveaux articles sur l'astronomie.
1. 8. 2026
Étoiles | Exoplanètes | Télescope spatial James Webb | Atmosphères planétaireWASP-39 b is a hot Jupiter, a large gas giant planet that orbits its host star at a very close distance, resulting in extremely high temperatures. Understanding the chemical makeup of its atmosphere provides insights into how the planet formed. A new analysis of data from the James Webb Space Telescope has now provided a precise inventory of the carbon and oxygen-bearing molecules in this planet's atmosphere using a single observation mode.
The research utilized an advanced technique called p...
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1. 8. 2026Étoiles | Exoplanètes | Formation des planèteAB Aurigae is a young star surrounded by a protoplanetary disk—a rotating ring of gas and dust where planets are currently forming. Recent observations have mapped the chemical composition of this disk, finding that molecules are not spread evenly. Instead, certain chemicals concentrate in specific areas, suggesting that both external material falling into the disk and the birth of new planets significantly shape its internal environment.
Rese...
Read article 1. 8. 2026Étoiles | Exoplanètes | Atmosphères planétaireThe atmosphere of the hot Jupiter exoplanet WASP-39b contains detectable amounts of deuterated water, also known as heavy water. This molecule, denoted as HDO, consists of one hydrogen atom, one oxygen atom, and one deuterium atom—a heavier isotope of hydrogen containing an extra neutron. This finding provides critical insight into the chemical history and evolution of this distant planet, which is located 702 light-years from our Sun.
The res...
Read article 1. 8. 2026Étoiles | ExoplanèteTabby's star, known scientifically as KIC 8462852, has long puzzled observers due to its deep, irregular dimming events. While these events were often attributed to clouds of dust from disintegrating comets or asteroids, new data from the Transiting Exoplanet Survey Satellite (TESS) show a unique, symmetric transit signature. This pattern suggests the presence of a massive object, such as a large planet or a brown dwarf, moving in front of the st...
Read article 1. 8. 2026Étoiles | Formation des planèteThe debris disk surrounding the star HD 15407 A is a collection of rocky material that acts as a record of planetary assembly. By comparing data collected nearly 15 years apart by the Spitzer and JWST space telescopes, the composition of this disk has been analyzed over time. While the total amount of warmth radiating from the dust has decreased, the underlying mineral signature remains remarkably consistent, pointing to an aging reservoir of mat...
Read article 1. 8. 2026Étoiles | Exoplanètes | Formation des planèteThe protoplanetary disk surrounding the star HD 163296 contains complex structures that provide insight into the birthplace of planets. By analyzing new and archival data from the Atacama Large Millimeter/submillimeter Array (ALMA), researchers have characterized the temperature, density, and size of dust grains within this vast cloud of gas and debris.
To study the disk, the analysis utilized spectral energy distribution fitting, a technique ...
Read article 1. 8. 2026Étoiles | Exoplanètes | Objets stellaires jeuneThe WISPIT 2 system, known for harboring two giant protoplanets within a multi-ringed disc of gas and dust, has been identified as a spectroscopic binary. This means the system consists of two stars orbiting one another, visible through changes in their light patterns rather than direct imaging of both stars. This discovery establishes the system as a primary location for studying how planets form in environments around two stars.
The system c...
Read article 1. 8. 2026Étoiles | Exoplanètes | Télescope spatial James Webb | Objets stellaires jeunes | Formation des planèteThe protoplanetary disk surrounding the star TW Hydrae, the nearest such disk to Earth, has been observed in unprecedented detail. Protoplanetary disks are rotating, flattened clouds of gas and dust that surround young stars, serving as the raw material for planet formation. By using the high-contrast imaging capabilities of the James Webb Space Telescope’s Near Infrared Camera, researchers have mapped the disk's architecture to better understand...
Read article 1. 8. 2026Étoiles | Exoplanètes | Naines bruneRadio waves emitted by ultra-cool dwarf stars suggest these objects possess radiation belts similar to those found around Jupiter. These belts consist of plasma, a state of matter containing charged particles, trapped within the star's magnetic field. This study investigates the origin of this plasma for the ultra-cool dwarf LSR J1835+3259 by modeling potential sources, such as escaping atmospheric ions or material from a volcanic moon.
The re...
Read article 1. 8. 2026Étoiles | Exoplanètes | Formation des planèteThe red dwarf star AU Microscopii is surrounded by a complex debris disk—a ring of dust and rocky debris—that features unusual clumps of dust moving at high speeds. These features, visible only when scattering light from the star, consist of tiny grains about 0.2 micrometers in size. New simulations suggest that the observed motion of these dust clumps may be caused by the gravitational influence of a yet-to-be-confirmed planet interacting with t...
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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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Parcourez les dernières études scientifiques sur les étoiles et les exoplanètes de notre galaxie. Découvrez les dernières recherches en astrophysique et en astronomie stellaire.
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