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Stellar Brief: 22. 10. 2026
A young, planet-hosting star called V1298 Tauri is showing how fiercely active infant planetary systems can be: radio emissions appeared in 90 percent of monitoring visits, while its X-ray brightness also changed and showed a stellar flare.
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Latest astronomy nouvelles
12. 4. 2026
Étoiles | Exoplanètes | TESSTOI-1710 A b is a warm Neptune-sized planet that orbits its star in the opposite direction to the star's rotation, a configuration known as anti-alignment. This rare arrangement was discovered using the Rossiter-McLaughlin effect, which measures how the planet's transit affects the star's light. The planet's orbit is almost exactly opposite to the star's spin, with a true obliquity of about 158 degrees.
The host star has a distant M-dwarf companion, but this companion is too far away to have ...
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12. 4. 2026Étoiles | ExoplanèteWASP-96b is a hot Saturn-like planet whose atmosphere has been studied using both the James Webb Space Telescope and ground-based telescopes. The combined data show clear signs of water vapor, carbon dioxide, and sodium in the planet's atmosphere. While carbon monoxide could not be confirmed, the results suggest that the atmosphere contains two to six times more heavy elements than its star, a property known as super-solar metallicity.
The pla...
Read article 12. 4. 2026Étoiles | ExoplanèteScientists used the James Webb Space Telescope to search for exomoons, similar to Earth's Moon, around the rocky planets TOI 700 d and e, which orbit in the habitable zone of a red dwarf star. While no exomoons were detected, the study improved the precision of the planets' orbits and sizes, making future searches more effective.
The team found a noise signal in the data, likely caused by the star's surface activity, which made it harder to de...
Read article 12. 4. 2026Étoiles | ExoplanèteWASP-11 b, also known as HAT-P-10 b, is a hot Jupiter with a low density, making it a good candidate for studying its atmosphere. Researchers collected 31 new transit observations and combined them with previous ground-based and space-based data to refine the planet's properties and analyze its orbit over 16 years.
The updated analysis shows that WASP-11 b's orbit is stable, with no signs of orbital decay or additional planets affecting its mo...
Read article 12. 4. 2026Étoiles | Exoplanètes | Naines rougeA new study has measured the alignment between the spin of an M dwarf star and the orbit of its very-low-mass stellar companion, marking the first such measurement for a double M dwarf system. Using the Rossiter-McLaughlin effect, researchers found that the two stars are well aligned, meaning the companion orbits in the same direction as the primary star spins. This suggests the system either formed aligned or was later realigned by tidal forces....
Read article 12. 4. 2026Étoiles | ExoplanèteGJ 436 is a red dwarf star with a Neptune-sized planet, GJ 436 b, orbiting close by. Scientists have long suspected that magnetic interactions between such planets and their stars could produce detectable signals, but direct evidence has been rare. In this study, researchers analyzed 17 years of spectroscopic data and found repeated increases in the star's activity that match the planet's orbital period and the star's rotation.
The team develo...
Read article 12. 4. 2026Étoiles | ExoplanèteHATS-75 b is a giant planet orbiting a red dwarf star, recently studied as part of a program using the James Webb Space Telescope. Scientists observed three transits of the planet, where it passed in front of its star, to analyze its atmosphere. The planet's spectrum showed a deeper transit at shorter wavelengths, which can be caused by hazes in the atmosphere or by features on the star's surface, such as starspots and bright regions.
By compa...
Read article 7. 4. 2026Étoiles | Objets stellaires jeunes | Formation des planèteHL Tauri is a young star surrounded by a protoplanetary disk with rings and gaps, where planets may be forming. Understanding turbulence in such disks is important because it affects how material moves and how planets grow. Until now, the strength of turbulence in the outer parts of these disks was not well known, especially in systems still gathering gas from their surroundings.
Researchers used ALMA telescope data to study the disk around HL...
Read article 6. 4. 2026Étoiles | Exoplanètes | Télescope spatial James Webb | Atmosphères planétaireGliese 3473 b (GJ 3473 b) is a rocky exoplanet orbiting close to its star, making it highly exposed to intense starlight. Scientists used the James Webb Space Telescope to observe the planet as it passed behind its star, a phenomenon called a secondary eclipse. These observations help reveal whether the planet has an atmosphere or if it is a bare rock, a key question for understanding how such worlds evolve under strong stellar radiation.
The ...
Read article 30. 3. 2026ÉtoileDO Tau is a young star surrounded by a disk of gas and dust, where planets may eventually form. This system is a T Tauri star, a type of young, Sun-like star still gathering material from its surroundings. By combining high-resolution infrared spectra and advanced imaging, researchers have studied the region where the star and its disk interact, revealing new details about how material moves from the disk onto the star.
The team used two main ...
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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 | |
| L 115-21 b | 10 / 2026 | 0.4 M⊕ | 41.9 ly | |
| TIC 219893931 b | 09 / 2026 | 8.9 M⊕ | 1319.5 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 |
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.
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