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Stellar Brief 23. 10. 2026

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Today’s astronomy highlights reveal a striking contrast on exoplanet WASP-43 b: models indicate that its nightside is largely cloudy, while its dayside appears clear at the level where light emerges. The findings offer a new way to compare the planet’s extreme weather with telescope observations.
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Sodium and water vapor detected in the atmosphere of the hot Saturn HAT-P-44 b
icon24. 2. 2026
iconSterne | Exoplaneten | | Planetenatmosphäre
Image: Sodium and water vapor detected in the atmosphere of the hot Saturn HAT-P-44 b
Astronomers have successfully analyzed the atmosphere of HAT-P-44 b, a gas giant similar in size and temperature to Saturn, located in a tight orbit around its star. Using the William Herschel Telescope, the team detected the chemical signature of sodium and found evidence of water vapor within the planet's envelope. The findings suggest the planet has a relatively clear atmosphere at high altitudes, free from thick clouds, and a chemical composition richer in heavy elements than our own Sun...
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How mountains and plateaus may prevent atmospheric collapse on rocky exoplanets
icon24. 2. 2026
iconSterne | Exoplaneten | Rote Zwerge
Image: How mountains and plateaus may prevent atmospheric collapse on rocky exoplanets
A new study reveals that the surface terrain of rocky planets orbiting M-dwarf stars plays a crucial role in their climate and habitability. These planets are often tidally locked, meaning one side always faces the star while the other remains in darkness. Researchers found that steep mountains and high plateaus create stationary atmospheric waves that disrupt air circulation. This process strengthens winds that carry moisture to the cold nig...
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Deep dive into the mysterious atmosphere of the warm Neptune Gliese 436 b
icon23. 2. 2026
iconSterne | Exoplaneten | Planetenatmosphären | Rote Zwerge
Image: Deep dive into the mysterious atmosphere of the warm Neptune Gliese 436 b
Astronomers have conducted the most detailed study to date of GJ 436 b, a famous 'warm Neptune' exoplanet located 33 light-years away. Despite its similarities to our own Neptune, this world orbits its red dwarf star so closely that its year lasts only 2.6 days. New high-resolution observations found no traces of expected gases like water vapor or methane, leading scientists to conclude that the planet is either shrouded in extremely high-alt...
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Failed magnetic flip: The intense space weather of active star AD Leo
icon23. 2. 2026
iconSterne
Image: Failed magnetic flip: The intense space weather of active star AD Leo
Astronomers monitoring the active red dwarf AD Leo recently watched for a rare event: a total reversal of its magnetic poles, similar to the 11-year cycle seen on our Sun. However, the 'flip' failed to happen. Instead, the star's magnetic field simplified and strengthened into a more stable configuration. Despite this lack of a reversal, the study shows that AD Leo is a violent neighbor; it loses mass through stellar winds at a rate ten times...
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Magnetic fields act as brakes and heaters in the atmosphere of ultra-hot Jupiter WASP-18 b
icon23. 2. 2026
iconSterne | Exoplanete
Image: Magnetic fields act as brakes and heaters in the atmosphere of ultra-hot Jupiter WASP-18 b
Researchers have discovered that the magnetic field of the giant planet WASP-18 b plays a dramatic role in controlling its weather. Because the planet is so close to its star, its atmosphere becomes 'ionized' or electrically charged. This allows the planet's magnetic field to act like a physical brake on high-altitude winds, creating a 'stop and go' effect in the atmospheric flow. This magnetic drag, combined with frictional heating, creates ...
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Discovery of a hot rocky world with Earth-like density orbiting a young star
icon23. 2. 2026
iconSterne | Exoplaneten | TESS | Orangefarbener Zwer
Image: Discovery of a hot rocky world with Earth-like density orbiting a young star
Astronomers have confirmed the existence of TOI-5734b, a 'hot sub-Neptune' planet orbiting a star slightly smaller and cooler than our Sun. Despite being about twice the size of Earth and nine times its mass, the planet has a density remarkably similar to our home world. This suggests that TOI-5734b is likely a rocky planet that has lost most of its original atmosphere due to the heat of its nearby young star. Located in a system only about 5...
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Stellar paternity tests: Tracing runaway stars back to their galactic nurseries
icon22. 2. 2026
iconSterne | Gaia | Massereiche Hauptreihensterne
Image: Stellar paternity tests: Tracing runaway stars back to their galactic nurseries
Most massive stars are born within crowded clusters in the flat disk of our Milky Way, yet some are found drifting far above or below this plane. By tracing the movements of 39 high-latitude B-type stars and nearly 450 star clusters using Gaia satellite data, researchers have successfully linked five of these 'orphaned' stars to their original birthplaces. These stars were likely kicked out of their home clusters millions of years ago at high...
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Chandra telescope captures first image of a protective bubble around a Sun-like star
icon22. 2. 2026
iconSterne | Chandra | Sonnähnliche Sterne
Image: Chandra telescope captures first image of a protective bubble around a Sun-like star
Astronomers using the Chandra X-ray Observatory have achieved a scientific first by resolving the 'astrosphere'—a protective bubble created by stellar winds—around a young, Sun-like star named HD 61005. Located about 119 light-years away, this star is a much more active version of our own Sun as it appeared in its youth. The study revealed a glowing halo of X-rays extending 220 astronomical units wide, caused by the star's wind crashing into t...
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Detailed analysis of WASP-31 b's atmosphere and orbital alignment
icon21. 2. 2026
iconSterne | Exoplanete
Image: Detailed analysis of WASP-31 b
A new study using the ESPRESSO spectrograph has provided a precise look at the giant exoplanet WASP-31 b. Researchers confirmed that the planet’s orbit is nearly perfectly aligned with its star's rotation. While attempting to scan the planet's atmosphere for chemical elements, the team found that the signal was heavily obscured by distortions caused by the planet passing in front of its star. Although previously suggested elements like potassium ...
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Discovery of two warm planets smaller than Saturn orbiting solar-type stars
icon21. 2. 2026
iconSterne | Exoplaneten | TESS
Image: Discovery of two warm planets smaller than Saturn orbiting solar-type stars
Researchers have discovered two new gas giant planets, TOI-883 b and TOI-899 b, which are similar in mass to a 'light' Saturn. These 'warm' giants orbit stars very much like our own Sun with orbital periods of approximately 10 and 11 days. Despite their similar sizes and environments, the two planets appear to have different internal compositions. This suggests they may have followed different evolutionary paths, providing a unique opportunit...
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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
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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Latest scientific studies

Durchsuchen Sie die neuesten wissenschaftlichen Studien zu Sternen und Exoplaneten in unserer Galaxie. Entdecken Sie die neuesten Forschungsergebnisse zur Astrophysik und Sternastronomie.

 WASP 121
858 ly
 study icon Detection of Solar-like Oscillations and Granulation at Infrared Wavelengths using JWST
today

WASP-43
284 ly
 study icon The coupled impacts of atmospheric dynamics and cloud microphysics on hot Jupiter atmospheres. I. An application to WASP-43b
today

TOI 3884
141 ly
 study icon A Headwind-like Helium Outflow from TOI-3884b
today

V1298 Tauri
352 ly
 study icon Radio and high-energy variable emission from a multi-wavelength follow-up of the infant planet-hosting star V1298 Tau
yesterday

TYC 5709-354-1
437 ly
 study icon Predictions for an unseen third planet in the WISPIT 2 system
yesterday

TIC 220432308
1129 ly
 +1 study icon Two Validated Planets and 179 Candidates From a TESS Faint Star Transit Search in the ULTRASAT Fields
21. 10. 2026

TOI 431
106 ly
 +4 study icon Thermal Evolution of Lava Planets Across System Ages: Predictions for Hell of a Survey
21. 10. 2026

L 115-21
41.9 ly
 study icon A sub-Earth-sized TESS planet candidate in the nearby M-dwarf binary GJ 774, most likely orbiting GJ 774 A (TIC 351339274)
21. 10. 2026

TOI-3686
841 ly
 study icon TOI-3686: A Hot Jupiter and Sub-Neptune In A 2:1 Mean-Motion Resonance
21. 10. 2026

TOI-270
73.3 ly
 study icon Ammonia-Hydrogen Phase Equilibria in Planetary Envelopes from First-Principles-Based Machine-Learning Molecular Dynamics
21. 10. 2026
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