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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
5. 2. 2026
Étoiles | Naines bruneAstronomers have identified four new transiting brown dwarfs, objects that are more massive than planets like Jupiter but smaller than stars. Three of these objects have unusually long orbits lasting over 100 days, significantly increasing the known population of such systems.
The study found that while brown dwarfs on short orbits usually circle metal-rich stars, those on longer orbits tend to be found around metal-poor stars, much like low-mass binary star systems. This suggests that brown...
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5. 2. 2026ÉtoileAstronomers have discovered a highly complex and ever-changing environment in the inner regions of the HD 142527 A star system, where planets typically form.
By using advanced infrared telescopes, researchers found that the dust disc surrounding the star is not a simple symmetrical ring, but a chaotic structure that shifts and changes from year to year. Surprisingly, the dust reaches much closer to the star than previously thought, extending ...
Read article 5. 2. 2026Étoiles | ExoplanèteScientists have conducted a detailed follow-up study of the young planet HIP 67522 b to pin down its exact size and weight. Located in a star system only 17 million years old—a mere blink of an eye compared to our 4.5-billion-year-old solar system—this planet is roughly the size of Neptune but significantly less dense.
By measuring how the planet's gravity tugs on its parent star, researchers determined it has a much lower mass than expected ...
Read article 3. 2. 2026Using a sophisticated new technique to clean up astronomical data, researchers have successfully confirmed the presence of a two-planet system orbiting the nearby red dwarf star Gl 725 B, located just 11.4 light-years away.
The study utilized the WAPITI method to remove 'noise' caused by Earth's own atmosphere, allowing for a much clearer view of the planets' gravitational tugs. The results verify the existence of a 'Super-Earth' with 3.5 tim...
Read article 3. 2. 2026Atmosphères planétaires | ExoplanèteThe rocky super-Earth 55 Cancri e is a world of extremes, featuring a global magma ocean with temperatures exceeding 3000 K. Recent findings suggest this planet possesses a carbon-rich atmosphere likely created by gases escaping from its molten interior.
This study reveals that tidal heating—internal friction caused by the star's gravity—acts as a crucial engine that keeps the planet's surface molten and prolongs the release of gases like car...
Read article 3. 2. 2026Exoplanètes | TESS | Exoplanètes habitableA new study has investigated the long-term stability and habitability of the TOI-700 system, a rare planetary family containing two Earth-sized worlds located within their star's habitable zone. Using advanced computer simulations, researchers analyzed how the gravity of these tightly packed planets affects their orbits and rotation over billions of years.
The findings show that while planetary interactions are stable enough to allow for surf...
Read article 3. 2. 2026Exoplanètes | ALMA | ÉtoileScientists using the ALMA observatory have confirmed the presence of significant turbulence within the protoplanetary disk—a swirling ring of gas and dust—surrounding the young star DM Tau. By analyzing millions of computer models against high-resolution observations of carbon monoxide gas, they found that the gas moves faster than can be explained by temperature alone.
This 'non-thermal' movement, or turbulence, is roughly 40% of the speed of...
Read article 1. 2. 2026Astronomers have captured a rare and powerful superflare on the star HD 22468 using the SVOM mission's hard X-ray camera. This massive explosion released an incredible amount of energy, estimated at up to 1.7e38 ergs, and heated plasma to temperatures exceeding 100 million degrees Kelvin—far hotter than the Sun's core. Observations taken shortly after the peak revealed material moving at speeds of 96 kilometers per second, suggesting either a vio...
Read article 1. 2. 2026Scientists have conducted a detailed study of HD 81809, a nearby binary system consisting of two stars very similar to our Sun. By using data from the TESS space telescope and ground-based spectroscopy, researchers discovered that these two stars have surprisingly different chemical compositions despite being born together.
The primary star is a subgiant that is older and metal-poor, while the secondary star appears to have a composition simi...
Read article 1. 2. 2026Exoplanètes | TESSAstronomers using the 'sherlock' pipeline have uncovered two new rocky planets, TOI-237 c and TOI-4336 A c, hidden in data from the TESS space telescope. These planets are roughly 20% larger than Earth and orbit small, cool stars known as M dwarfs. TOI-237 c is a particularly hot world that zips around its star in just 1.74 days, while TOI-4336 A c resides in a complex triple-star system with an orbital period of about 7.6 days. Both planets are ...
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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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