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Stellar Brief: 22. 10. 2026
A young, planet-hosting star called V1298 Tauri is showing how fiercely active infant planetary systems can be: radio emissions appeared in 90 percent of monitoring visits, while its X-ray brightness also changed and showed a stellar flare.
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Latest astronomy nouvelles
1. 8. 2026
Étoiles | Exoplanètes | TESS | Naines rouges | Formation des planètes | Naines blancheThe giant planet TOI-5628Ab orbits a mid-type Red dwarf star every 4.34 days. This planet is part of a complex system that also includes a distant white dwarf companion, a remnant of a star that has exhausted its nuclear fuel. By studying this system and comparing it to a wider population of similar stars, the research identifies a strong connection between the presence of distant stellar companions and the existence of large planets orbiting very close to their host Red dwarf stars.
To chara...
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1. 8. 2026Étoiles | ExoplanèteThe π Mensae star system, which hosts the first exoplanet detected by the Transiting Exoplanet Survey Satellite (TESS), has been the subject of a comprehensive new study. By combining six years of TESS photometry — the measurement of a star's brightness over time to detect dips caused by orbiting planets — with 22 years of radial velocity data, which tracks the tiny wobbles in a star’s motion caused by a planet’s gravitational pull, this research...
Read article 1. 8. 2026Étoiles | Exoplanètes | Formation des planèteThe protoplanetary disk surrounding the star HD 169142 contains complex dust structures that provide clues about how planets form. A new analytical framework has been developed to process data from the Atacama Large Millimeter/submillimeter Array (ALMA), an interferometer that combines radio telescopes to capture high-resolution images. This method improves upon traditional techniques by reducing biases caused by limited image resolution, allowin...
Read article 1. 8. 2026Étoiles | Exoplanètes | TESSResearchers have completed a detailed re-analysis of two planetary systems, TOI-4438 and TOI-442, providing more precise physical data for their orbiting planets. By combining new transit observations from the TESS space telescope with high-resolution infrared spectroscopy, the study clarifies the properties of these worlds. The analysis also investigated the magnetic activity of the host stars, which are both Red dwarf stars, to improve the accu...
Read article 1. 8. 2026Étoiles | Exoplanètes | Atmosphères planétaires | Exoplanètes habitableSpectroscopic observations have identified escaping helium from the atmosphere of LHS 1140b, a rocky exoplanet located within the habitable zone of its host star. While scientists have previously observed atmospheric loss on massive gas giants, such evidence for rocky, Earth-like worlds is rare. This finding provides significant insight into the evolution and composition of planetary atmospheres in systems orbiting low-mass stars.
The findings...
Read article 1. 8. 2026Étoiles | ExoplanèteTIC 241249530 b is a rare, highly eccentric planet often described as a hot Jupiter progenitor. Orbiting a star at a distance that varies significantly, this planet is currently in the process of migrating toward its host star. This transition is driven by high-eccentricity migration, a process where a planet’s orbit is stretched into a very elongated shape, eventually shrinking and circularizing due to intense tidal forces.
The research exami...
Read article 1. 8. 2026Étoiles | Exoplanètes | Formation des planètePlanet formation begins within protoplanetary disks, which are swirling clouds of gas and dust surrounding young stars. To understand how planets emerge, it is critical to determine the size of dust grains within these disks. A new method has been developed to estimate these sizes by measuring how quickly different regions of a disk cool down. This technique specifically analyzes transitional disks where an inner disk is tilted, casting a distinc...
Read article 1. 8. 2026Étoiles | Exoplanètes | Télescope spatial James Webb | Atmosphères planétaireWASP-39 b is a hot Jupiter, a large gas giant planet that orbits its host star at a very close distance, resulting in extremely high temperatures. Understanding the chemical makeup of its atmosphere provides insights into how the planet formed. A new analysis of data from the James Webb Space Telescope has now provided a precise inventory of the carbon and oxygen-bearing molecules in this planet's atmosphere using a single observation mode.
Th...
Read article 1. 8. 2026Étoiles | Exoplanètes | Formation des planèteAB Aurigae is a young star surrounded by a protoplanetary disk—a rotating ring of gas and dust where planets are currently forming. Recent observations have mapped the chemical composition of this disk, finding that molecules are not spread evenly. Instead, certain chemicals concentrate in specific areas, suggesting that both external material falling into the disk and the birth of new planets significantly shape its internal environment.
Rese...
Read article 1. 8. 2026Étoiles | Exoplanètes | Atmosphères planétaireThe atmosphere of the hot Jupiter exoplanet WASP-39b contains detectable amounts of deuterated water, also known as heavy water. This molecule, denoted as HDO, consists of one hydrogen atom, one oxygen atom, and one deuterium atom—a heavier isotope of hydrogen containing an extra neutron. This finding provides critical insight into the chemical history and evolution of this distant planet, which is located 702 light-years from our Sun.
The res...
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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 | |
| L 115-21 b | 10 / 2026 | 0.4 M⊕ | 41.9 ly | |
| TIC 219893931 b | 09 / 2026 | 8.9 M⊕ | 1319.5 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 |
Newly discovered exoplanets
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