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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.
23. 8. 2026
Étoiles | ExoplanèteEclipsing binary stars—systems where two stars periodically pass in front of each other from our perspective—often show small shifts in their orbital timings. These shifts, known as apsidal motion, are sometimes used to search for third objects like planets orbiting both stars. This study evaluates two such systems, CH Ind and SW CMa, to determine if their observed orbital changes truly indicate the presence of external planets or if they are simply the result of natural stellar behaviors.
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23. 8. 2026Étoiles | ExoplanèteThe exoplanet Gliese 514 b orbits within the habitable zone of a Red dwarf star located approximately 25 light-years from Earth. Because the planet follows an eccentric path—meaning its orbit is more oval-shaped than circular—it experiences significant seasonal changes in the amount of stellar light it receives. These conditions make it an important target for future direct-imaging missions, prompting an assessment of its potential surface climat...
Read article 23. 8. 2026Étoiles | ExoplanèteNumerical simulations have evaluated whether planets in the 70 Ophiuchi, 36 Ophiuchi, and Gamma Leonis binary systems can remain stable in their habitable zones. The habitable zone is the range of distances from a star where conditions might allow liquid water to exist on a planet's surface. While Gamma Leonis is unlikely to support stable planets due to its extreme orbital dynamics, the 70 Ophiuchi and 36 Ophiuchi systems show promising conditio...
Read article 23. 8. 2026Étoiles | Exoplanètes | Atmosphères planétaireUnderstanding how planets form requires detailed knowledge of the chemical makeup of their host stars. This study provides a comprehensive analysis of the host stars AF Leporis A and Epsilon Indi A, which are known to harbor cold, directly imaged planets. By examining the light from these stars with high-resolution spectroscopy—a technique that breaks down starlight into its component colors to identify chemical elements—the composition of their ...
Read article 23. 8. 2026Étoiles | Exoplanètes | Télescope spatial James WebbThe exoplanet HD 80606b is a massive gas giant known for its extreme eccentricity, meaning its path around its host star is highly elongated rather than circular. Because it transits and is eclipsed by its host star, the G5V star HD 80606, it serves as a unique laboratory for studying planetary dynamics. New high-precision data from the James Webb Space Telescope, combined with 25 years of previous radial velocity measurements, were used to exami...
Read article 23. 8. 2026Étoiles | Exoplanètes | Super-TerreThe internal makeup of the super-Earth Gliese 486b has been estimated by analyzing the chemical properties of its host star. Because rocky planets typically inherit their chemical composition from the materials that formed their parent stars, understanding the composition of a star provides a window into the building blocks of its orbiting planets. This research provides a new framework that links stellar chemical data to the internal structure a...
Read article 23. 8. 2026Étoiles | Exoplanètes | Télescope spatial James WebbThe Trappist-1 system, a small star orbited by seven Earth-sized planets, has been a major target for the James Webb Space Telescope. While the inner planets have been studied directly, the potential to detect thermal emission—the heat energy radiated by a planet—from the outer planets remains a significant challenge due to interference from the host star itself.
This analysis compiled existing observations from five separate projects to see i...
Read article 23. 8. 2026Étoiles | Exoplanètes | Télescope spatial James WebbRecent observations of the temperate planet LHS 1140 b have provided new insights into its atmosphere. While previous data suggested the presence of helium escaping from the planet, detailed analysis of four planetary transits—the period when a planet passes in front of its star—reveals no consistent evidence of such activity, indicating that earlier detections may have been influenced by stellar changes or instrumental factors.
Researchers ex...
Read article 23. 8. 2026Étoiles | Exoplanètes | Télescope spatial James WebbThe warm Saturn-sized exoplanet WASP-69 b exhibits significant atmospheric differences between its morning and evening sides. New observations reveal an asymmetric distribution of aerosols—tiny particles suspended in the atmosphere—which create distinct cloud conditions across the planet. This discovery helps explain how planets at temperatures near 1,000 Kelvin manage the cycle of cloud formation and evaporation as material travels around the gl...
Read article 13. 8. 2026Étoiles | ExoplanèteThe thermal characteristics of 55 Cancri e, an ultra-short period rocky planet, are better understood by accounting for the planet’s three-dimensional geometry and its rotation. By calculating how sunlight hits the planet at various angles throughout its day, it is possible to model the temperature distribution across its surface more accurately. This approach clarifies why the planet exhibits a specific thermal imprint observed by telescope meas...
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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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