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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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4. 3. 2026
Sterne | Exoplaneten | Lava-PlaneteK2-141 b is an ultra-short period planet, known as a lava world, that orbits very close to its star. This extreme environment causes one side of the planet to be extremely hot, covered by a magma ocean, while the other side remains much cooler and solid. Scientists used computer models to study how the planet's interior moves and how this affects volcanic activity, especially on the nightside, which is not directly heated by the star.
The research explored different ways the planet's mantle, ...
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4. 3. 2026Sterne | Exoplaneten | PlanetenatmosphäreTOI-2076 is a young star system, about 200 million years old, that hosts four planets slightly larger than Earth. These planets, called sub-Neptunes, orbit close to their star and offer a unique look at how planetary systems change in their early stages. Unlike many young systems where planets are locked in precise orbital patterns called resonances, the planets in TOI-2076 are near but not exactly in resonance, making their arrangement less stab...
Read article 4. 3. 2026Exoplaneten | Junge Sternobjekte | Planetenentstehung | Sterne | James-Webb-WeltraumteleskoTWA 7 is a young star surrounded by a debris disk, which is a ring of dust and small objects left over from planet formation. Recent observations with the JWST telescope have directly imaged a planet far from the star and revealed detailed features in the disk, such as a sharply defined inner edge and an unusual horseshoe-shaped structure. These features suggest that the system's planets are shaping the disk in complex ways.
Researchers used c...
Read article 3. 3. 2026Sterne | Exoplaneten | TESS | Rote ZwergeResearchers have detected and validated TOI-1080 b (SIPS J1825-5212 b), a small, temperate exoplanet that transits its quiet M4V host star every 3.97 days. The host star is located 25.6 parsecs away. The planet was first identified by the TESS mission and confirmed with both TESS and ground-based observations. Analysis of the light curves shows that TOI-1080 b has a radius of about 1.2 times that of Earth and an equilibrium temperature of 36...
Read article 3. 3. 2026Sterne | Exoplaneten | Supererde | PlanetenatmosphäreScientists have used high-resolution transmission spectroscopy from the Gemini-South telescope to study the atmosphere of the temperate super-Earth exoplanet L 98-59 d. This approach, typically used for larger and hotter planets, was successfully applied to a smaller, more temperate world, demonstrating the capability of ground-based facilities to characterize super-Earth atmospheres.
The team confirmed the presence of hydrogen sulfide (H2S) i...
Read article 2. 3. 2026Sterne | Exoplaneten | TESS | Rote ZwergeResearchers conducted the most comprehensive search for planets around mid-to-late M dwarf stars using data from the TESS mission. Surveying over 8,000 such stars, they identified 77 transiting planet candidates and measured how often planets occur as a function of their size, orbital period, and the amount of starlight they receive. The study found that each mid-to-late M dwarf hosts on average about 1.1 planets larger than Earth within 30 ...
Read article 2. 3. 2026Sterne | Exoplaneten | Planetenatmosphären | James-Webb-WeltraumteleskoScientists conducted the most sensitive direct imaging search for the nearby Jupiter-analog exoplanet epsilon Eridani b using the JWST/NIRCam coronagraph between 4 and 5 micrometers. Despite achieving a record-breaking contrast sensitivity at the planet’s expected separation, the planet itself was not directly imaged. The study updated the age of the host star epsilon Eridani to 1.1 billion years, which affects the estimated temperature of t...
Read article 2. 3. 2026Sterne | Junge SternobjekteDO Tauri is a classical T Tauri star, a type of young star still surrounded by a disk of gas and dust. Researchers monitored DO Tau using the SPIRou spectropolarimeter at the Canada-France-Hawaii Telescope between 2020 and 2025, aiming to understand its magnetic activity and accretion processes.
The study detected strong, variable magnetic fields in DO Tau, including a rare magnetic polarity reversal—meaning the star's large-sc...
Read article 1. 3. 2026SterneYY Herculis is a symbiotic star system that has experienced several brightening events over the past century. In 2021, astronomers observed a hot-type outburst in YY Herculis using the Himalayan Chandra telescope, focusing on changes that occur during the system's secondary minimum.
This study monitored YY Herculis from 2021 to 2023, covering one and a half orbital cycles. Researchers analyzed how the temperature and brightness...
Read article 1. 3. 2026Sterne | Rote ZwergeM dwarfs are small, cool stars that can become tidally deformed when they are part of close binary systems called cataclysmic variables. These distortions change the stars’ shapes and may affect how their magnetic fields are generated. Studying these effects helps scientists understand stellar dynamos and magnetic activity in stars beyond our Sun.
This study examined the relationship between the magnetic cycle period and the rota...
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Neu entdeckte Exoplaneten
| 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 |
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