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Stellar Brief: 20. 10. 2026
The planet-forming disk around HD 100546 contains an unexpectedly high amount of methyl formate: ALMA measured a methyl-formate-to-methanol ratio of about 2, hinting that active chemistry is reshaping the ingredients from which planets form.
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Latest astronomy nouvelles
8. 3. 2026
Étoiles | TESSAn eclipsing binary star system consists of two stars orbiting each other so close that they periodically block each other's light as seen from Earth. Over millions to billions of years, gravity between these stars reshapes their orbits and spinning rates in a process called tidal evolution, which helps us understand how both close star pairs and exoplanet systems change over time.
Researchers examined 68 binary pairs (among them EBLM J0040+01) from the EBLM survey using NASA's TESS space tel...
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8. 3. 2026Étoiles | Naines blanches | Géante
RS Ophiuchi is a recurrent nova system, where a white dwarf and a red giant star orbit each other closely. The dwarf sucks material from the giant which leads to repeating eruptions known as nova. In 2021, RS Ophiuchi experienced another eruption, providing astronomers with a rare chance to observe changes before, during, and after the event using near-infrared light.
Researchers collected spectra before the eruption, showing the signature of ...
Read article 7. 3. 2026Étoiles | Étoiles à neutroScientists have used X-ray observations to create a detailed map of the Fe K emission in the low-mass X-ray binary system 4U 1822-371. This system consists of a compact object, likely a neutron star, and a companion star orbiting each other every 5.57 hours. The study used data from the XRISM satellite, covering eleven orbits of the system, to track how the X-ray emission changes with the orbital period.
By analyzing the Doppler shifts in the ...
Read article 6. 3. 2026Étoiles | Exoplanètes | Atmosphères planétaireNASA's Pandora mission is a small satellite project designed to study exoplanets and their host stars by separating the effects of star activity from the signals of exoplanet atmospheres. Pandora will observe both visible and near-infrared light from systems where planets pass in front of their stars, allowing scientists to monitor changes in the star and better understand the atmospheres of the planets.
The mission, set to run from 2026 to 20...
Read article 6. 3. 2026Étoiles | Étoiles massives de la séquence principaleResearchers have closely examined HD 188101, a little-studied star with a weak magnetic field, using both spectroscopic and photometric observations. This star has properties typical of main-sequence B9 stars, including its effective temperature and surface gravity. The study focused on measuring the amounts of several elements in the star's atmosphere and how these compare to the Sun.
The team found that HD 188101 has higher than solar amount...
Read article 6. 3. 2026Étoiles | Étoiles de type solaireA new approach has been developed to measure the movement of stars by analyzing their light in detail. This method does not rely on a reference template, which can sometimes introduce errors, especially when the data is not perfect. It is designed to work with different types of stars and instruments, making it flexible for various astronomical studies.
The method, called TILARA (Template-Independent Line-by-line Algorithm for Radial velocity ...
Read article 6. 3. 2026Étoiles | Exoplanètes | Super-Terre | Naine orangeHD 93083 (Gliese 1137) is a orange star already known to host a Saturn-mass planet, HD 93083 b. In this study, scientists analyzed 13 years of precise spectroscopic data to search for new planets and improve our understanding of the known planet's properties.
The team refined the orbital parameters and minimum mass of HD 93083 b, providing a more accurate picture of this Saturn-mass exoplanet. In addition, they discovered a new planetary candi...
Read article 5. 3. 2026Étoiles | Exoplanètes | Naines rougeM dwarf stars are small, cool stars that are popular targets for finding exoplanets because their size makes it easier to detect planets in their habitable zones. However, these stars often have magnetic activity that can mimic the signals of planets, making it important to understand their activity cycles. This study focused on two M dwarfs, Gliese 617 A and Lalande 21185 (Gliese 411), both known to host exoplanets.
Researchers analyzed 13 ye...
Read article 5. 3. 2026Étoiles | Formation des planètes | Exoplanètes | Étoiles massives de la séquence principaleβ Pictoris is a well-known star surrounded by a disk of dust and debris, making it a prime example for studying how planetary systems evolve. By observing this disk at different wavelengths, scientists can learn about the structure and behavior of the material around the star. This study focused on measuring the vertical height of the disk using images from mid-infrared to millimeter wavelengths.
Researchers used advanced modeling to analyze t...
Read article 5. 3. 2026Étoiles | Exoplanètes | Formation des planètes | Objets stellaires jeunes | Planètes océHL Tauri is a young star surrounded by a disk of gas and dust where planets are forming. Scientists are interested in finding complex molecules like methanol in such disks because these molecules are important for the chemistry that could lead to life. Methanol is often found around other young stars, but its presence in planet-forming disks is rare.
In this study, researchers looked for methanol in the disk around HL Tauri, motivated by the d...
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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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