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Latest astronomy nouvelles
Restez informé(e) des dernières actualités astronomiques, des découvertes sur les étoiles et les exoplanètes, et des recherches en cours. Découvrez de nouveaux articles sur l'astronomie.
30. 9. 2026
Étoiles | 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 characteristics of these infant planets.
The research an...
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30. 9. 2026Étoiles | ExoplanèteLHS 3844 b is a rocky super-Earth orbiting a nearby Red dwarf. Because it lacks a significant atmosphere and does not have a molten magma ocean on its dayside, it serves as a unique laboratory for studying the surface of planets outside our solar system. By analyzing the planet’s heat signatures, researchers can infer what kind of rock covers its surface.
The James Webb Space Telescope captured detailed mid-infrared light emissions from the pl...
Read article 29. 9. 2026Étoiles | Exoplanètes | Exoplanètes habitableLHS 1140 b is a rocky planet orbiting within the habitable zone of a Red dwarf star. Previous observations detected helium escaping from the planet as it transited, or passed in front of, its host star. Because stars emit high-energy radiation that can strip away planetary atmospheres, researchers analyzed whether fluctuations in the star's X-ray and ultraviolet output could explain the changing levels of escaping helium.
Using the XMM-Newton ...
Read article 29. 9. 2026Étoiles | Exoplanètes | Naine orangeThe 61 Cygni binary system, located approximately 11.4 light-years from Earth, is one of our closest neighbors and a primary target for searching for Earth-like planets. New analysis of this system provides evidence for a candidate giant planet orbiting the stars. The object, categorized as a super-Jupiter—a planet significantly more massive than Jupiter—is estimated to orbit at a distance similar to that of the outer planets in our own solar sys...
Read article 29. 9. 2026Étoiles | Exoplanètes | Naines rouges | TESSThe red dwarf star TOI-210 hosts a temperate sub-Neptune exoplanet, confirmed through a combination of transit observations and precise velocity measurements. This planet, designated TOI-210 b, orbits its host star every 9.01 days and maintains an equilibrium temperature of approximately 368 Kelvin. The system serves as a valuable laboratory for studying the composition and atmospheric retention of small, volatile-rich worlds orbiting small, cool...
Read article 29. 9. 2026Étoiles | Exoplanètes | Atmosphères planétaireTransmission spectroscopy is a primary method used to study the atmospheres of planets outside our solar system as they pass in front of their host stars. However, star spots and other surface features on a host star can mimic or hide the signal of a planet's atmosphere, causing errors in data gathered by telescopes like the James Webb Space Telescope. A new method has been developed to accurately measure and remove this stellar interference.
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Read article 29. 9. 2026Étoiles | Exoplanètes | Télescope spatial James Webb | Atmosphères planétaireThe James Webb Space Telescope has provided detailed data on the atmospheres of two sub-Neptune planets orbiting the sun-like star TOI-125. By studying these two planets, TOI-125 b and TOI-125 c, within the same star system, researchers can compare how their atmospheres formed and evolved under similar conditions. Both planets show signs of dense, cloud-covered atmospheres or high levels of heavy elements, often referred to as metal enrichment, w...
Read article 29. 9. 2026Étoiles | Exoplanètes | Formation des planèteThe TW Hydrae protoplanetary disk, a swirling cloud of gas and dust surrounding a young star where planets are currently forming, contains a prominent localized accumulation of dust located at a distance of 52 astronomical units from the star. New observations provide a high-resolution look at the internal structure and movement of this feature, which is commonly referred to as a dust blob. The study clarifies how this material moves and its poss...
Read article 29. 9. 2026Étoiles | Exoplanètes | Étoiles de type solaireA new low-mass planet, HD 126053 b, has been confirmed orbiting a solar-type star located within 25 parsecs (approximately 81.5 light-years) of the Sun. This planet completes an orbit around its host star every 10.91 days. The discovery was made using extreme precision radial velocity instruments, which detect the tiny wobbles in a star's position caused by the gravitational pull of orbiting planets. This method allows for the identification of s...
Read article 29. 9. 2026Étoiles | Exoplanètes | Hubble | Naine orangeThe rocky exoplanet TOI-2431 b, which orbits its host star in just 5.4 hours, has been studied using the Hubble Space Telescope to analyze its thermal characteristics. This planet is characterized by an extreme surface environment where day-night heat redistribution appears highly inefficient, preventing the transport of heat from the dayside to the nightside. This finding offers new insights into the nature of ultra-short-period planets.
Rese...
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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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