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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
13. 3. 2026
Étoiles | ExoplanèteLong-period giant planets, or cold Jupiters, play a key role in shaping planetary systems, but they are difficult to detect because they orbit far from their stars. Traditional methods like radial velocity and transit surveys have limited sensitivity at these distances. By combining long-term radial velocity data with precise astrometry from the Hipparcos and Gaia missions, astronomers can now better detect and measure these distant worlds.
In this study, researchers extended the Chile-Hertfo...
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13. 3. 2026Étoiles | Exoplanètes | Atmosphères planétaires | Télescope spatial James WebbWASP-107 b is a warm gas giant planet that has been studied in detail using the James Webb Space Telescope (JWST). Its atmosphere shows a unique feature at 8–10 micrometers, thought to be caused by silicate clouds. Scientists aimed to explain the planet’s full spectrum, from near-infrared to mid-infrared, using a physically realistic model of cloud formation and temperature.
The research team used a model that links how clouds form with how he...
Read article 12. 3. 2026Étoiles | ExoplanèteHD 332231 b is a warm sub-Saturn exoplanet that orbits close to its host star. Astronomers studied the timing of its transits—when the planet passes in front of the star—and found that these events do not occur at perfectly regular intervals. Instead, the transit times show a repeating pattern, known as transit timing variations (TTVs), which can reveal the presence of other planets in the system.
Using precise data from the TESS mission and g...
Read article 12. 3. 2026Étoiles | Exoplanètes | TESS | Naines rougeTOI-4616 b is an Earth-sized exoplanet that orbits a nearby red dwarf star, just 28 parsecs from Earth. Red dwarfs are small, cool stars, and their low brightness makes it easier to spot planets passing in front of them. This planet was discovered and confirmed using data from NASA’s TESS mission, along with ground-based telescopes and detailed follow-up observations.
The host star, classified as an M4 dwarf, is about 19% the size and mass of ...
Read article 11. 3. 2026Étoiles | Exoplanètes | Télescope spatial James Webb | Atmosphères planétaire
The nearby star Epsilon Indi hosts a cold gas giant planet, Epsilon Indi A b, located just under 12 light years from Earth. Using the James Webb Space Telescope (JWST), astronomers captured the longest-wavelength image ever taken of an exoplanet, extending up to 25 micrometers. By combining these new images with decades of radial velocity and astrometric data, the team precisely determined the planet’s orbit and mass.
The planet’s light was me...
Read article 10. 3. 2026Étoiles | Exoplanètes | ALMA | Objets stellaires jeuneHD 34282 is a young star surrounded by a disk of gas and dust, where planets may be forming. Using the ALMA telescope, astronomers captured detailed images of this disk at several wavelengths, revealing a bright arc and a complex pattern of rings and gaps. These features help scientists understand how dust and gas behave in planet-forming environments.
The observations show that the bright arc has a lower spectral index than the surrounding ri...
Read article 9. 3. 2026Étoiles | Exoplanète
The Beta Pictoris system is famous for its young star, two giant planets, and a large disk of dust and gas. Recent studies have found many comet-like bodies orbiting the star (exocomets). To understand how these exocomets form and evolve, researchers simulated the system with over 100,000 test particles, tracking their paths for 25 million years.
The simulations show that most material is quickly cleared out by the planets, except for two main...
Read article 9. 3. 2026Étoiles | Exoplanètes | TESS | Naine orangeTOI-4504 is an orange dwarf star that hosts two giant planets, both orbiting in a special pattern called a 2:1 mean-motion resonance. This means that for every orbit the outer planet completes, the inner planet completes exactly two. The planets, named TOI-4504 c and d, have orbital periods of 82.8 and 41.3 days, respectively, and show some of the largest known variations in the timing of their transits across the star.
Recent data from the TE...
Read article 9. 3. 2026Étoiles | Exoplanètes | TESSAstronomers have used data from NASA’s TESS mission to study 347 single exoplanets with orbital periods between 8 and 200 days. These planets, called 'warm' because they are neither too close nor too far from their stars, show a surprising link between their size and the shape of their orbits.
The team analyzed the planets by grouping them into size categories: sub-Neptunes, sub-Saturns, and Jovians. They found that most small and medium-sized...
Read article 8. 3. 2026Étoiles | ExoplanèteThe Dispersed Matter Planet Project (DMPP) is a survey using the radial velocity method to search for planets around stars that show unusual activity, which may be caused by close-in planets losing their atmospheres. This project aims to understand how common such planets are and to find new examples.
In this study, researchers discovered seven new planetary signals in five different star systems, including DMPP-2c and d, HD67200/DMPP-6b and c...
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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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