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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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1. 3. 2026
Rote Zwerge | SterneMira, also known as omicron Ceti, is one of the most famous variable stars known since antiquity — a giant red star located about 300 light-years away that brightens and dims over a cycle of roughly 332 days. It is not alone: Mira has a faint companion called Mira B, thought to be a white dwarf, the dense Earth-sized remnant left behind when a Sun-like star exhausts its nuclear fuel. A new study used observations of rapid brightness flickering in the Mira system to measure the mass and prop...
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1. 3. 2026PICASO 4.0 is a major update to an open-source tool for simulating the atmospheres of brown dwarfs and exoplanets. The new version adds cloud modeling, photochemistry, and energy injection features, helping scientists better understand these distant worlds.
The update is motivated by recent discoveries from the JWST telescope, which revealed complex chemistry and clouds in exoplanet atmospheres. PICASO 4.0 is benchmarked against ...
Read article 1. 3. 2026Sterne | Massereiche HauptreihensterneEta Carinae, a supermassive binary system, is undergoing extreme wind-driven mass loss, producing shock-heated X-ray emitting plasmas. Observations by the XRISM X-ray observatory in 2023 and 2024 captured unprecedentedly detailed spectra in the iron K band (6.2–7.1 keV).
Key findings
- Three velocity components were identified in the hydrogen-like and helium-like iron lines, with maximum velocities of 2000–3000 k...
28. 2. 2026Sterne | NeutronensternePulsars are highly magnetised, rapidly rotating neutron stars — the ultra-dense remnants left behind when a massive star ends its life in a supernova explosion. They emit narrow beams of radio waves that sweep across space like a lighthouse, producing precise pulses detectable by radio telescopes on Earth. Some pulsars display a puzzling behaviour called nulling, where their radio emission abruptly becomes undetectable, or drops far below its nor...
Read article 28. 2. 2026Sterne | Rote ZwergeAD Leonis (AD Leo) is an active M-dwarf — a small, cool red star — located about 16 light-years from Earth that is known for producing frequent and energetic flares. Stellar flares are intense, brief brightenings caused by magnetic reconnection, a process in which tangled magnetic field lines snap and realign, releasing a burst of energy as light across many wavelengths, similar to solar flares but often far more powerful relative to the star's s...
Read article 28. 2. 2026Sterne | Exoplaneten | PlanetenatmosphäreGliese 436 b is a warm Neptune — a planet roughly the size and mass of Neptune — orbiting the red dwarf star Gliese 436, located about 33 light-years from Earth. Astronomers used the Keck II telescope on Mauna Kea, Hawaii, fitted with an instrument called KPIC (Keck Planet Imager and Characterizer). KPIC routes starlight through a hair-thin single-mode optical fiber before feeding it into a high-resolution spectrograph — a technique that suppress...
Read article 27. 2. 2026Sterne | ExoplaneteAstronomers comparing new James Webb Space Telescope data with 20-year-old Spitzer observations have discovered significant changes in the dusty, planet-forming disks surrounding two young stars, Sz 96 and IP Tau.
The study found that the infrared light emitted by silicates—minerals similar to sand or rocks—shifted in brightness by up to 35%, suggesting that the inner structure of these disks is physically changing over time. Furthermore, the ...
Read article 27. 2. 2026Sterne | Exoplaneten | James-Webb-WeltraumteleskoResearchers using the James Webb Space Telescope have analyzed the atmosphere of the sub-Neptune planet HD 15337 c, which is about 2.5 times the size of Earth. The study revealed a 'featureless' spectrum, meaning the planet's atmosphere is likely very thick, enriched with heavy elements, or covered in high-altitude clouds and haze.
Interestingly, the planet arrived for its transit earlier than expected, suggesting the presence of an undiscove...
Read article 27. 2. 2026Sterne | ExoplaneteUsing the James Webb Space Telescope, astronomers have examined the atmosphere of TOI-260 b, a planet roughly 1.7 times the size of Earth that sits in the mysterious 'radius valley'—a gap where few planets are found. The observations revealed a mostly flat spectrum, suggesting the planet might have a very heavy atmosphere enriched with elements other than hydrogen and helium, or perhaps hidden by high-altitude clouds.
While a small potential s...
Read article 27. 2. 2026Sterne | Exoplaneten | PlanetenatmosphäreThis study explores the capabilities of the upcoming Extremely Large Telescope (ELT) and its ANDES instrument in analyzing the atmospheres of young, distant planets similar to Neptune but smaller. By simulating observations of the exoplanets V1298 Tau b and TOI-451 c, researchers demonstrated that we will soon be able to detect water, hydrogen sulfide, and carbon monoxide on these worlds.
The research highlights that by carefully comparing dat...
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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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