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Stellar Brief: 20. 10. 2026
Today’s standout finding changes the story of PDS 70: the young star is estimated to be 12 to 16 million years old, about three times older than previously thought. Alpha Centauri was the leading Stellarcatalog search query, with 1,537 impressions on October 19.
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Latest astronomy nouvelles
16. 2. 2026
Étoiles | Exoplanètes | Objets stellaires jeunes | Formation des planèteAstronomers using the ALMA telescope have detected rare molecules of silicon sulfide (SiS) in the dusty disk surrounding the young star PDS 66. This chemical signature is highly unusual because these molecules normally freeze onto dust grains in the cold reaches of a planetary system.
The detection of a warm, compact source of SiS gas about 60 astronomical units from the star suggests the presence of a 'protoplanet'—a planet still in the process of forming. This growing world likely has a wa...
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16. 2. 2026Étoiles | Exoplanètes | Jupiter chaud | TESSAstronomers have discovered a massive gas giant planet, NGTS-38 b, orbiting a bright, metal-rich star similar to our Sun but slightly hotter. This 'warm super-Jupiter' stands out due to its unusually long orbital period of 180.5 days, which is much longer than most planets discovered by the transit method.
Unlike the scorched 'hot Jupiters' that orbit their stars in just a few days, NGTS-38 b maintains a relatively cool equilibrium temperatur...
Read article 15. 2. 2026ÉtoileScientists are testing a specialized method called intensity interferometry to measure the precise physical dimensions of 'Red Clump' stars, such as HD 17652. These aging stars are vital benchmarks used to calculate distances across the universe, including the gap between us and the Large Magellanic Cloud.
By analyzing how light interferes at different wavelengths, researchers can map the stellar surface and account for 'limb darkening'—the e...
Read article 15. 2. 2026Étoiles | NuSTAR | Supergéantes | Étoiles à neutroUsing the NuSTAR space telescope, researchers have performed a deep analysis of the X-ray binary 4U 1700-37, a system where a compact object—likely a neutron star—is pulling material from a massive supergiant star HD 153919.
By studying the high-energy light emitted as this material falls toward the object, the team looked for 'cyclotron lines,' which act as a direct probe of a star's magnetic strength. While no rhythmic pulses were found, th...
Read article 15. 2. 2026Étoiles | Objets stellaires jeuneAstronomers have discovered that the unusual star HP Tau/G2 is likely the result of two stars crashing into each other. This 'walkaway' star is currently speeding away from its birthplace alongside another star, KPNO 15, after a complex gravitational dance in a multiple star system caused them to be ejected 5,600 years ago. HP Tau/G2 exhibits strange characteristics for its age, including an oddly large size, fast rotation, and a flattened shape....
Read article 15. 2. 2026Étoiles | ExoplanèteScientists have developed a new technique called the Variable Planetary Infrared Excess (VPIE) method to study exoplanets that never transit (pass in front of) their host stars. By analyzing how the total light from a star system changes as a planet orbits and shows different phases—much like the Moon's phases—this method can isolate the planet's heat signature without needing a complex model of the star itself.
Tests using simulated James We...
Read article 15. 2. 2026Étoiles | Exoplanètes | Gaia | Objets stellaires jeunes | Formation des planèteUsing high-precision data from the Hipparcos and Gaia satellites, researchers have analyzed 11 young star systems surrounded by transition disks to find hidden orbiting bodies.
The study successfully detected companions in several systems, including confirmed low-mass stars or sub-stellar objects around HD 142527, AB Aurigae, and MWC 758. In other cases, such as TW Hya and HD 100453, the lack of detection allowed scientists to set strict mass...
Read article 15. 2. 2026Étoiles | Exoplanètes | Atmosphères planétaireAstronomers have peeked into the atmosphere of HD 80606 b, one of the most unusual gas giants known due to its incredibly stretched, eccentric orbit. As the planet swings extremely close to its parent star—reaching a distance of just 0.03 AU, much closer than Mercury is to our Sun—it experiences rapid, intense heating. Using high-resolution spectroscopy from the Keck Observatory, researchers looked for signs of chemical changes during this therma...
Read article 13. 2. 2026Exoplanètes | TESS | Étoiles | Super-TerreA statistical analysis of 132 planetary systems reveals a strong architectural link between giant outer planets and smaller inner worlds. Researchers found that stars hosting a 'cold Jupiter'—a gas giant orbiting far from its sun—are significantly more likely to also host 'hot super-Earths' in close-in orbits.
The study suggests that approximately 87% of these giant planet systems also contain at least one smaller rocky planet closer to the s...
Read article 13. 2. 2026Étoiles | Exoplanètes | Naines rougeNew analysis of the four-planet system surrounding the red dwarf LHS 1903 provides a rare look at how planets form when gas is scarce. While the inner planets possess varying atmospheric thicknesses, the outermost world, LHS 1903 e, stands out because it completely lacks a gaseous envelope despite its distant orbit.
This suggests that the planet likely formed from material already depleted of gas, rather than losing its atmosphere later in li...
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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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