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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 news
23. 10. 2023 (accepted)
Stars | ExoplaneTwo new sub-Neptunes, TOI-904 b and c, have been discovered orbiting the early M dwarf TOI-904. The outer planet, TOI-904 c, is the longest-period M dwarf exoplanet found by TESS, with period 84 days and an estimated equilibrium temperature of 217 K. Future mass measurements and transmission spectroscopy of the similar-sized planets in this system could determine whether they are also similar in density and composition, suggesting a common formation pathway, or whether they have distinct origins...
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23. 10. 2023 (accepted)Stars | ExoplaneThe two planets in the HD 152843 system have nearly equal masses but differing radii, and the outer planet HD 152843 c has the longest orbital period of any known low-density exoplanet. HD 152843 c is also located in the Saturn valley, the observed lack of planets larger than Neptune but smaller than Saturn. The orbital periods of the planets suggest they are near a 5:3 mean motion resonance, and the brightness of the host star and the low densit...
Read article 20. 10. 2023 (accepted)Stars | Exoplanets | TESSA temperate, highly eccentric sub-Saturn has been discovered orbiting the bright K-dwarf TOI-2134, in addition to an inner mini-Neptune that was discovered three years ago. The outer planet has a radius of 7.27 R⊕ and a mass of 41.86 M⊕, and a high eccentricity of 0.67, positioning it in the habitable zone of its system for part of its orbit. Further observations are needed to fully constrain the orbit of the outer planet and to study the spin-or...
Read article 18. 10. 2023 (accepted)Stars | TESS | ExoplaneThe planet has more than 3 Earth radii and a 16 Earth masses, suggesting a likely volatile-rich planet. Transit timing variations in the system suggest the presence of an outer planet candidate near a 2:1 resonance, with a mass of 6.8 Earths. Further observations are needed to explicitly identify the resonance and further characterize the properties of the system....
Read article 11. 10. 2023 (accepted)Stars | ExoplaneA new analysis of exo-Neptune transmission spectra reveals that these planets have very cloudy atmospheres and high metallicity. Colder exo-Neptunes may have clearer atmospheres, making them better targets for future studies and the search for life beyond Earth...
Read article 9. 10. 2023 (accepted)Stars | ExoplaneBoth planets have short periods and relatively low masses, but Gliese 724 b is the most eccentric single exoplanet yet discovered around an M dwarf....
Read article 9. 10. 2023 (accepted)Stars | Exoplanets | White dwarfAstrometric planet candidates around white dwarfs can be confirmed and characterized by combining astrometric data with spectroscopic and photometric data. Radial velocity and infrared photometry can be used to probe the mass of the objects producing some of the astrometric signals, and rule out parts of the brown dwarf and planet mass parameter space....
Read article 5. 10. 2023 (accepted)Stars | Exoplanets | Kepler | ExomooExoplanet Kepler 1513 b was discovered in 2016. Observed transit timing variations were thought to be originating in planet-moon interaction. New observations show that better explanation for the variations is an existence of a second, non-transiting planet in the system....
Read article 5. 10. 2023 (accepted)StarStudy of 66 stars with planets and planet candidates found that those with stellar companions have more false positive planet detections and shorter orbital periods for their planets. This suggests that stellar companions can truncate planet-forming disks and affect planet formation....
Read article 5. 10. 2023 (accepted)StarJWST has observed the atmosphere of HD 209458b, a hot Jupiter exoplanet. The observations reveal that the planet has a super-solar metallicity and a very low C/O ratio, suggesting that it has undergone significant contamination by evaporating planetesimals while migrating inward....
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Recently discovered exoplanets
| 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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Browse the latest scientific studies on stars and exoplanets in our galaxy. Stellar Catalog provides access to scientific data from astrophysics and stellar or planetary astronomy. It's a resource for anyone interested in the newest discoveries about what lies beyond our solar system.
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