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Stellar Brief: 21. 10. 2026
TOI-3686 is the only known hot-Jupiter system in a true 2:1 orbital resonance: its outer planet takes almost exactly twice as long to circle its star as the inner planet.
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Latest astronomy nouvelles
5. 10. 2026
Étoiles | ExoplanèteThe TOI-1408 system is known to host two planets in a 2:1 orbital resonance - meaning the inner planet completes two orbits for every one orbit of the outer planet - alongside a distant companion. A recent study of TESS space telescope data and ground-based observations has reassessed the system's configuration, finding that current measurements of the planets are influenced by complex factors in the data modeling.
Researchers found that the likelihood functions, which represent the probabili...
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4. 10. 2026Étoiles | Exoplanètes | Étoiles de type solaireThe Kepler-51 system contains planets with extremely low bulk densities, often described as super-puff planets. These worlds are so light for their size that they challenge current models of how planets are built. One theory suggests these planets may actually have hidden ring systems that make them appear larger than they are, thereby causing researchers to underestimate their true density. This study uses a method called asterodensity profiling...
Read article 3. 10. 2026Étoiles | Exoplanètes | Naine orange | Télescope spatial James Webb | Atmosphères planétaireEpsilon Indi Ab is a temperate super-Jupiter orbiting the star Epsilon Indi A. As one of the closest and coldest directly imaged exoplanets, it serves as a bridge for comparing the atmospheric properties of hot gas giants found around other stars with the cooler giants of our own solar system. Infrared observations have now successfully mapped the chemical makeup of its atmosphere despite the challenging light interference from its host star.
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Read article 3. 10. 2026Étoiles | Exoplanètes | Étoiles de type solaire | Télescope spatial James Webb | Atmosphères planétaireLTT 9779 b is an ultrahot Neptune-sized exoplanet that occupies a rare region of space known as the hot Neptune desert, where such planets are seldom found. Despite its intense exposure to radiation from its host star, LTT 9779 b possesses a confirmed atmosphere. A new comprehensive study using data from the James Webb Space Telescope provides a detailed look at the chemical and physical characteristics of this exotic world's atmosphere.
By an...
Read article 3. 10. 2026Étoiles | ExoplanèteOuter giant planets play a critical role in the development of planetary systems, yet their long orbital paths make them challenging to observe through traditional methods. By analyzing astrometric data from the Hipparcos and Gaia space missions, researchers have identified 29 candidate planets located far from their host stars. These findings suggest the presence of massive companions orbiting beyond the previously known planets in these systems...
Read article 3. 10. 2026Étoiles | Exoplanètes | Naines rouges | Télescope spatial James Webb | Atmosphères planétaireRocky planets orbiting Red dwarf stars present a unique challenge for observers because the stars themselves often have active surfaces that can mimic the signals of an atmosphere. A new analysis method has been developed to separate these stellar signals from potential atmospheric data. By applying this technique to four observations of the planet TRAPPIST-1 c, researchers have determined that the planet does not show evidence of a significant, ...
Read article 3. 10. 2026Étoiles | Exoplanètes | ALMA | Formation des planètes | Naine orangeEpsilon Eridani, a nearby orange dwarf star located about 10.5 light-years away, hosts the closest known debris disk - a ring of dust and icy rocks orbiting the star. This system also features a large planet, Epsilon Eridani b, which is similar to Jupiter. New measurements of the outer debris belt suggest it is remarkably circular and dynamically cold, meaning the particles within it have very orderly, stable orbits.
To determine the shape of ...
Read article 30. 9. 2026Étoiles | Exoplanètes | Télescope spatial James Webb | Atmosphères planétaires | Étoiles de type solaireLTT 9779 b is a Neptune-sized planet that orbits extremely close to its parent star, placing it within the so-called hot Neptune desert - a region where such planets are rarely found due to intense stellar radiation. Observations of this planet are essential to understanding how its atmosphere manages to persist under these extreme conditions. New data from the James Webb Space Telescope provides a broad look at the chemical and physical characte...
Read article 30. 9. 2026Étoiles | Exoplanètes | TESS | Naines rougeA new sub-Neptune planet, TOI-6981 b (LSPM J0804+1116 b), has been identified orbiting a Red dwarf star. The planet is notable for its cold temperature of approximately 170 Kelvin (minus 103 degrees Celsius), which positions it at the water ice line. This is the boundary in a star system where it is cold enough for water vapor to condense into solid ice. Its unique location and characteristics offer a rare opportunity to study cold planetary atmo...
Read article 30. 9. 2026Étoiles | ExoplanèteHIP 67522 is a young star system, aged only 17 million years, which hosts two giant planets. By observing the timing of when these planets cross in front of their host star—an event known as a transit—researchers can detect subtle shifts in the schedule caused by the gravitational tugging between the two worlds. These variations in timing, known as transit timing variations, serve as a precise tool for calculating the masses and orbital character...
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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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