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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
6. 4. 2026
Étoiles | Exoplanètes | Télescope spatial James Webb | Atmosphères planétaireGliese 3473 b (GJ 3473 b) is a rocky exoplanet orbiting close to its star, making it highly exposed to intense starlight. Scientists used the James Webb Space Telescope to observe the planet as it passed behind its star, a phenomenon called a secondary eclipse. These observations help reveal whether the planet has an atmosphere or if it is a bare rock, a key question for understanding how such worlds evolve under strong stellar radiation.
The team used JWST's MIRI instrument to measure the pl...
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30. 3. 2026ÉtoileDO Tau is a young star surrounded by a disk of gas and dust, where planets may eventually form. This system is a T Tauri star, a type of young, Sun-like star still gathering material from its surroundings. By combining high-resolution infrared spectra and advanced imaging, researchers have studied the region where the star and its disk interact, revealing new details about how material moves from the disk onto the star.
The team used two main ...
Read article 30. 3. 2026Étoiles | Exoplanètes | Super-TerreGJ 523 b (BD+39 2675 b) is a recently confirmed planet orbiting a mid-type orange dwarf star called Gliese 523. This planet is unusually massive for its size, earning it the classification of a mega-Earth. At just 170 million years old, GJ 523b is much younger than most known exoplanets, and it orbits its star every 17.75 days. Its high density suggests it has very little gas, despite its large mass, which is rare for planets of this size....
Read article 30. 3. 2026Étoiles | Exoplanètes | TESS | Jupiter chaudTOI-7169 b is a giant planet, known as a hot Jupiter, that orbits a star with very low metal content. Most planets are found around stars rich in elements heavier than hydrogen and helium, but TOI-7169 b challenges this trend by orbiting a metal-poor star. This discovery helps scientists understand how planets can form in environments with fewer heavy elements.
The planet was detected using data from the TESS space telescope and ground-based o...
Read article 30. 3. 2026Étoiles | Exoplanètes | Atmosphères planétaireK2-18 b is a temperate sub-Neptune planet orbiting a red dwarf star, making it a key target for understanding atmospheres beyond our Solar System. Recent observations with the James Webb Space Telescope have provided new insights into its atmospheric composition and structure, helping to bridge the gap between planets like Neptune and the more commonly studied hot-Jupiters.
Researchers used a detailed computer model to study K2-18 b's atmosphe...
Read article 24. 3. 2026Étoiles | ExoplanèteHot Jupiters and ultra-hot Jupiters are gas giant planets that orbit very close to their stars, making them excellent targets for atmospheric studies. This research examined five such planets—WASP-50b, WASP-117b, WASP-156b, WASP-167b, and WASP-173Ab—using high-resolution spectroscopy to search for atmospheric signals. These planets are located near the so-called Neptune desert, a region where Neptune-sized planets are rare at short orbital period...
Read article 24. 3. 2026Étoiles | ExoplanèteWISPIT 2 is a young star surrounded by a multi-ringed disk, already known to host a giant planet, WISPIT 2b, in a wide gap. This study confirms the existence of a second planet, WISPIT 2c, using new imaging and spectroscopic data from the VLT/SPHERE and VLTI/GRAVITY instruments. The observations reveal a point-like source close to the star, with a K-band spectrum showing features typical of a young giant planet, including carbon monoxide absorpti...
Read article 23. 3. 2026ÉtoileGK Persei, a nova that erupted in 1901, continues to surprise astronomers more than a century later. Using data from the SPHEREx space telescope, researchers discovered a large, bipolar shell of molecular hydrogen surrounding the nova. This shell, measuring 18 by 10 arcminutes, matches the shape and location of the known H-alpha nebulosity around GK Persei, which was previously thought to be an ancient planetary nebula.
The hydrogen shell is m...
Read article 23. 3. 2026Étoiles | ExoplanèteThe Gaia mission’s precise astrometric data has enabled the discovery of new exoplanet candidates, but confirming these planets can be challenging. In 2022, Gaia Data Release 3 (DR3) announced a candidate planet around the bright, Sun-like star HD 12800. However, follow-up observations using the TRES spectrograph failed to detect any evidence of the proposed planet. The data show that if the planet had existed as originally reported, it would hav...
Read article 23. 3. 2026Étoiles | Exoplanètes | Formation des planètes | Objets stellaires jeune
DX Chamaeleontis (HD 104237) is a binary star system surrounded by a compact, asymmetric ring of dust and gas at a radius of 0.43 astronomical units. This ring lies just outside the binary’s orbit, much closer than expected for a typical circumbinary disk.
Normally, the strong gravity of the binary would clear out the inner region, creating a large gap between the stars and the disk. Previous simulations, assuming the disk orbits in the same ...
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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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