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Stellar Brief: 19. 10. 2026
The cold brown dwarf WISE 0855 has weather that looks strikingly planet-like: James Webb observations reveal patchy water clouds and changing atmospheric gases, including carbon monoxide and phosphine.
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Latest astronomy nouvelles
21. 5. 2026
Étoiles | Exoplanètes | Naines brunes | TESS | Sous-géanteTOI-5882 is a subgiant star that stands out for its unusually high lithium content. The star also hosts a massive brown dwarf companion, which can disturb the orbits of any inner planets. Theoretical models suggest that subgiant stars in a certain mass range can retain lithium signatures if they have recently swallowed a planet. To test this, researchers measured the lithium abundance in TOI-5882 using high-resolution spectra and compared it to a control group of similar subgiants. They found th...
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20. 5. 2026Étoiles | Exoplanètes | Super-Terre | Exoplanètes habitableGliese 3378 (GJ 3378) is a red dwarf star located just 7.7 parsecs from the Sun. It hosts a planet, Gliese 3378b, which was previously thought to be a super-Earth with a mass of about five Earth masses and an orbital period of nearly twenty-five days. New observations using several high-precision spectrographs, including HPF, NEID, CARMENES, and SPIRou, have led to a revised understanding of this planet’s properties. The updated analysis finds th...
Read article 15. 5. 2026Étoiles | ExoplanèteLTT 1445A b is a rocky planet orbiting a red dwarf star, and astronomers are using the James Webb Space Telescope to search for signs of an atmosphere. This study introduces a new method that uses climate models and Bayesian statistics to analyze eclipse spectra, which are measurements of the planet’s heat as it passes behind its star. The method fits the observed data with models that account for the planet’s temperature and possible atmospheric...
Read article 15. 5. 2026Étoiles | ExoplanèteLTT 1445 A b is the closest known rocky planet orbiting a red dwarf star. Scientists used the James Webb Space Telescope (JWST) to observe the planet as it passed in front of its star, measuring how starlight filtered through its atmosphere at wavelengths between three and five micrometers. Two independent data analysis methods were used to ensure the results were reliable. The observations achieved very high precision, allowing researchers to lo...
Read article 15. 5. 2026Étoiles | ExoplanèteTRAPPIST-1 is a system of planets orbiting a low-mass star, with several planets considered potentially habitable. This study uses a version of the HEXTOR energy balance model to explore the possible climate states of these planets, focusing on those that are similar to Earth and orbit in a way that keeps the same side facing their star. The model is first tested on rapidly rotating, Earth-like planets and shows expected patterns of climate stabi...
Read article 15. 5. 2026Étoiles | ExoplanèteHAT-P-70b is an ultra-hot Jupiter, a type of giant planet that orbits very close to its star and experiences extreme temperatures. The dayside of HAT-P-70b is so hot that many metals become ionized, while the nightside remains cool enough for some elements to condense. Using the MAROON-X high-resolution spectrograph, researchers studied the planet’s atmosphere and detected fourteen different metals, including iron, titanium, calcium, chromium, so...
Read article 15. 5. 2026Étoiles | Exoplanètes | Super-Terre | Naines rouges | TESS
Ross 318 (Gliese 48) is a red dwarf star with strong magnetic activity and a rotation period of about fifty-one and a half days. Researchers analyzed over a decade of radial velocity data from CARMENES and HIRES, along with TESS space telescope observations, to search for planets around this star. They discovered a planet, Ross 318 b (Gliese 48 b), which has a minimum mass about six times that of Earth and orbits the star every thirty-nine days. ...
Read article 15. 5. 2026ÉtoileV1094 Sco is a large protoplanetary disk that displays several pairs of rings and gaps far from its central star. Using high-resolution images from the Atacama Large Millimeter/submillimeter Array and the Very Large Telescope, researchers studied the disk's structure in detail. The dust in the disk forms four narrow ring-gap pairs at large distances, while gas traced by carbon monoxide extends even farther and moves in a pattern called Keplerian ...
Read article 15. 5. 2026Étoiles | Exoplanètes | Naines brune51 Pegasi is a Sun-like star known for hosting the first confirmed planet outside our solar system. Recent research has analyzed over thirty years of data to search for another, more distant companion in this system. Scientists combined radial velocity measurements, astrometry, and high-contrast imaging to look for signs of a giant planet or brown dwarf far from the star. The data show a slight acceleration in the star's motion, which could be ca...
Read article 14. 5. 2026Étoiles | ExoplanèteTOI-4311 is an orange dwarf star located between the Galactic thick disk and Hercules stream. This star hosts two planets: an ultra-short-period super-Earth and a longer period sub-Neptune. The super-Earth completes an orbit in about one day and is very dense, while the sub-Neptune has a longer orbit of around fifteen days. These planets were first detected by the TESS space telescope, and their properties were refined using CHEOPS and HARPS obse...
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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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