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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.
13. 8. 2026
Étoiles | Exoplanètes | Atmosphères planétaireAF Lep b is a young gas giant planet with a mass roughly three to four times that of Jupiter, orbiting its host star at a distance of approximately 9 astronomical units. Recent observations using the James Webb Space Telescope have allowed for a detailed look at the chemical composition of its atmosphere, providing new insights into how this massive planet formed and grew during the early stages of its solar system.
The research team analyzed high-contrast spectroscopy, which is a method of i...
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13. 8. 2026Étoiles | Exoplanètes | Formation des planèteThe young planetary systems PDS 70 and SR 12 provide new insights into how giant planets and their moons form. By studying the dust disks surrounding the planets PDS 70 c and SR 12 c, it is clear that these distant worlds share significant similarities with the development of Jupiter and Saturn. These observations help explain how gas and dust accumulate to form planets and smaller satellites in the early stages of a star system's life.
The pl...
Read article 13. 8. 2026Étoiles | Exoplanètes | TESS | Étoiles de type solaireA multi-planet system has been identified orbiting TOI-3850, a G0 dwarf star similar in metallicity to our Sun. The system contains two warm planets—gas-rich worlds that orbit closer to their star than Jupiter, but further than the extremely hot planets commonly found in close proximity to their hosts. These planets are currently situated near a gravitational configuration known as a 2:1 mean motion resonance, where the outer planet completes one...
Read article 13. 8. 2026Étoiles | ExoplanèteRecent observations have analyzed the environments around three stars - DMPP-7, HD 67200, and HD 2134 — to search for evidence of orbiting planets. By studying radial velocity, which measures the tiny wobbles in a star’s position caused by the gravitational tug of an orbiting planet, the project examined these systems to distinguish between genuine planetary signals and the natural activity of the stars themselves.
The researchers used a Bayes...
Read article 10. 8. 2026Étoiles | Exoplanètes | Formation des planèteProtoplanetary disks are vast, swirling clouds of gas and dust surrounding young stars that eventually coalesce to form planets. A new method has been developed to analyze the physical properties of these disks by examining how their dust rings appear when viewed at an angle. By studying these shapes, researchers can determine the intrinsic width, thickness, and light-blocking capacity, known as optical depth, of the dust material within the disk...
Read article 10. 8. 2026Étoiles | Étoiles massives de la séquence principaleThe Lambda Bootis phenomenon is a unique chemical condition in stars where certain elements, known as refractory elements (materials that condense at high temperatures, such as iron), are significantly less abundant than expected, while volatile elements remain at normal levels. This feature has now been identified in the massive early B-type star HD 37356, marking the first time this characteristic has been observed in such a massive stellar obj...
Read article 9. 8. 2026Étoiles | Exoplanètes | Naines blancheThe white dwarf WD J0914+1914 is surrounded by a ring of gas containing hydrogen, oxygen, and sulfur. This material originates from a nearby Neptune-like or super-puff planet—a planet with a very low density—that is losing its atmosphere due to intense radiation from the star. The escaping gas forms a disk around the star, which is then slowly pulled onto the white dwarf's surface, creating the unique light signals observed by instruments.
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Read article 9. 8. 2026Étoiles | Exoplanètes | Naines rougeThe exoplanet Ross 128 b, which orbits a nearby Red dwarf star, serves as a primary model for understanding the atmospheres of rocky worlds. By simulating various climate conditions and atmospheric compositions, new research assesses how these planets reflect light, a critical factor for future observations using high-contrast imaging and high-resolution spectroscopy—techniques that separate a planet's light from its host star to analyze its atmo...
Read article 9. 8. 2026Étoiles | Exoplanètes | Télescope spatial James Webb | Atmosphères planétaires | TESS | Naines rougeThe giant planet TOI-3235 b, which has a mass about two-thirds that of Jupiter and a temperature of 604 Kelvin, orbits a small Red dwarf star. Studying the atmospheres of such massive planets around small, cool stars is important for understanding how they formed, as current theories suggest they should be rare. However, light from the host star often interferes with these observations, creating signals that can be mistaken for atmospheric featur...
Read article 8. 8. 2026Étoiles | ExoplanèteThe star TOI-3272 is currently under investigation for hosting a potential hot Jupiter, a massive gas giant planet that orbits extremely close to its host star. Researchers identified this candidate using data from the Transiting Exoplanet Survey Satellite (TESS), which detects the periodic dimming of stars caused by a planet passing in front of them. The system is particularly interesting because the host star appears to be relatively young, wit...
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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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