etoile
exoplanètes
Nouvelles
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 | 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 how new worlds take shape.
The observations ut...
Read article 
Advertisement
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...
Read article 1. 8. 2026Étoiles | Exoplanètes | Atmosphères planétaires | Jupiter chaudWASP-178 b is an ultra-hot Jupiter, a gas giant planet that orbits extremely close to its parent star, resulting in scorching atmospheric temperatures. New high-resolution optical observations of the planet’s dayside reveal a thermal inversion, a state where the temperature in the upper atmosphere increases with altitude, opposite to the expected cooling trend. These findings help clarify the complex, three-dimensional processes driving extreme w...
Read article 7. 7. 2026Étoiles | Objets stellaires jeunes | Formation des planèteCI Tauri is a young star surrounded by a protoplanetary disk—a rotating, flattened cloud of gas and dust from which planets are born. While these disks often contain rings and gaps that signal planet formation, narrow structures can be too small for telescopes to resolve directly. A new method has now revealed hidden, fine-scale features within the disk of CI Tauri by measuring how brightness changes at different angles.
The analysis focused o...
Read article 7. 7. 2026Étoiles | Exoplanètes | Trous noirs | TESSThe TOI 2796 system, which is known to host a hot Jupiter—a massive gas giant planet orbiting very close to its parent star—faces potential disruption from encounters with primordial black holes. Primordial black holes are hypothetical objects thought to have formed in the very early universe, long before the first stars and galaxies emerged. Using numerical three-body simulations, the gravitational effects of such an encounter on the planetary s...
Read article 7. 7. 2026Étoiles | Exoplanètes | Naines brunes | ExoluneEvidence for satellites orbiting the brown dwarf CD-35 2722 B has been identified using precise light measurements. While thousands of planets have been found orbiting stars, satellites around objects outside our solar system—known as exosatellites—have remained elusive and controversial. This study presents a strong detection of at least one, and possibly two, massive objects circling this brown dwarf, providing new data on how such systems form...
Read article 6. 7. 2026Étoiles | Exoplanètes | TESS | Naine orangeA newly identified planet, TOI-2195 A b, has been found orbiting an orange dwarf star. Classified as an inflated hot Neptune, this planet completes an orbit around its host star every 4.16 days. The discovery offers a new perspective on how such planets form, suggesting they may have once been much larger gas giants that lost a significant portion of their mass.
Researchers analyzed the system using the Rossiter-McLaughlin effect, which measur...
Read article 5. 7. 2026Étoiles | Exoplanètes | Atmosphères planétaires | Naines blancheWhite dwarfs are the dense, cooling remnants of stars like our Sun. While it is known that some planets can survive the violent evolution of their host star into a white dwarf, little is known about the makeup of their atmospheres. Observations of the planet WD 1856 b now reveal an atmosphere containing hydrocarbons and aerosols, along with unexpectedly high temperatures, offering new insights into how these planets survive and evolve long after ...
Read article 5. 7. 2026Étoiles | Exoplanètes | Gaia | TESS | Naine orangeThe Transiting Exoplanet Survey Satellite (TESS) has successfully identified its first gravitationally bound planet through a technique known as microlensing. Microlensing occurs when the gravity of a star and its orbiting planet acts like a magnifying glass, bending and brightening the light of a more distant background star as the system passes in front of it. The newly characterized planet, designated Gaia23bra b, orbits an orange dwarf star.
...
Read article Top article categories
Filtered articles by category.
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
Latest scientific studies
Parcourez les dernières études scientifiques sur les étoiles et les exoplanètes de notre galaxie. Découvrez les dernières recherches en astrophysique et en astronomie stellaire.
Publications plus anciennes