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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
9. 5. 2026
Étoiles | Exoplanètes | TESS | Jupiter chaudAstronomers have confirmed TOI-159 b, a giant planet orbiting a young (about 150 million years old), fast-rotating, and pulsating Doradus star. This planet is the hottest known hot Jupiter with a significant orbital eccentricity, making it a rare find. The host star's rapid rotation and pulsations make such discoveries challenging, but the team used a combination of radial velocity, transit, and spectro-photometric data to confirm the planet and study its properties.
TOI-159 b orbits in a clo...
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9. 5. 2026Étoiles | Formation des planètes | ExoplanèteHD 142527 is a young star with a complex disk and a known low-mass companion. Using advanced imaging techniques with VLT/SPHERE, astronomers explored the inner region of the system, searching for hidden companions and features that shape the disk. They confirmed and updated properties of the known companion, HD 142527 B, and identified a new candidate companion about 14 au from the star, which could be a young planet, brown dwarf, or a disk featu...
Read article 9. 5. 2026ÉtoileResearchers observed the near-UV (NUV) transit of XO-3 b, a massive hot Jupiter with an eccentric orbit, using XMM-Newton and ground-based telescopes. The NUV transit was found to be 30-70% deeper than in the optical, suggesting a large NUV-absorbing atmosphere. Interestingly, the NUV transit occurred about 22 minutes later than expected from optical data, even though the optical transits showed no timing variations.
The team explored possible...
Read article 9. 5. 2026ÉtoileTRAPPIST-1, an ultra-cool dwarf star, is known for frequent stellar flares that impact its planets' atmospheres and can interfere with observations. Researchers combined data from JWST and Kepler/K2 to analyze the flare-frequency distribution (FFD) across four orders of magnitude in energy. By converting all flare energies to the TESS bandpass and correcting for detection sensitivities, they found that the cumulative FFD follows a single power la...
Read article 6. 5. 2026Étoiles | Exoplanètes | Naines brunes | Super-TerreAstronomers have discovered a remarkable planetary system around the young star TOI-201, featuring three very different companions: a hot super-Earth, a warm Jupiter, and a highly eccentric brown dwarf. Using long-term radial velocity and transit timing data, the team found that all three objects orbit in the same plane. The brown dwarf, with a mass about 16 times that of Jupiter and an 8-year orbit, is the longest-period transiting object ever c...
Read article 6. 5. 2026ÉtoileHD 20794 is a nearby, metal-poor G-type star hosting a compact planetary system, including a super-Earth near the habitable zone. Scientists used detailed stellar evolution models to study its structure and chemical abundances. By comparing 252 models with observed properties like temperature, gravity, luminosity, and radius, they found the best fit for a star with 0.80 solar masses and an age of about 9 billion years.
The models accurately re...
Read article 6. 5. 2026Étoiles | Exoplanètes | ALMAPDS70c is a young, forming planet still accreting material from its surrounding disk. Using ALMA radio observations at 343 GHz, scientists studied how the planet's radio brightness changes over time. By carefully subtracting the average background signal and analyzing the data in short time intervals, they found that PDS70c's radio emission can vary significantly on hour-long timescales.
In the 2017 data, the planet's radio brightness increase...
Read article 6. 5. 2026Étoiles | Exoplanètes | TESSTOI-4600 is an early K dwarf star with two rare, transiting giant planets on long orbits. TOI-4600b has an orbital period of about 83 days and a mass of nearly 75 Earth masses, while TOI-4600c orbits every 483 days and is about 213 Earth masses. Both planets show significant transit timing variations, with their transits shifting by about an hour, indicating strong gravitational interactions between them.
Researchers combined new TESS data, gr...
Read article 6. 5. 2026Étoiles | Exoplanètes | Télescope spatial James Webb | Atmosphères planétaireCOCONUTS-2b is one of the coldest known planetary-mass companions, orbiting far from its M dwarf host star. Using the JWST MIRI/MRS instrument, scientists obtained a detailed spectrum of its atmosphere at a temperature of about 480 K. For the first time, they detected rare isotopologues—molecules with different isotopes—of ammonia and water: ^{15}NH3, H2^{18}O, and H2^{17}O. This is the first clear evidence of oxygen isotopes in water in a cold p...
Read article 6. 5. 2026Étoiles | Exoplanètes | Télescope spatial James WebbLHS 3844 b is a rocky exoplanet whose surface was studied using mid-infrared spectroscopy from the James Webb Space Telescope. The planet's thermal emission spectrum between 5 and 12 microns matches that of a dark, low-silica surface, such as basalt or olivine-rich rock. The data rule out the presence of fresh powdery surfaces, but space weathering could darken such materials to match the observations.
The spectrum shows no evidence for signif...
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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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