[astro-ph.EP] Recent observations of V1298-Tau b, a warm sub-Neptune (R=9.85±0.3R⊕, M=13.1±5.3,M⊕, Teq=670K) orbiting a young (10-30Myr) K star, show depleted methane and surprising abundances of CO2 in its atmosphere.
Spaceweather
![[LEFT] Logarithmic ion number density (cm−3 ) distributions of O+ (left column) and O2 + (right column) in the X-Z plane for Kepler-1649 b’s dayside at 0.7 Gyr (top row) and 4.8 Gyrs (bottom row). Coordinates are normalized to the planetary radius RP. [RIGHT] Logarithmic ion number density (cm−3 ) distributions of O+ (left column) and O2 + (right column) in the X-Z plane for Kepler-1649 c’s dayside at 0.7 Gyr (top row) and 4.8 Gyrs (bottom row). Coordinates are normalized to the planetary radius RP. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/04/Evolving-Atmospheric-Ion-Escape.png?resize=1200%2C720&ssl=1)
Posted inAtmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Space Weather & Heliophysics, Status Report
Evolving Atmospheric Ion Escape from Kepler-1649 b and c: Power-Law Trends in Atmospheric Loss
Rocky planets orbiting M-dwarf stars are prime targets for characterizing terrestrial atmospheres, yet their long-term evolution under intense stellar winds and high-energy radiation remains poorly understood.
Posted inAstrogeology, Astronomy & Telescopes, Biosignatures & Paleobiology, Gaia - Planetary Perspectives, Habitable Zones, Magnetic Fields, Electromagnetism, bioelectricity,, Press Release, Radiation, Space Weather & Heliophysics
Cosmic Rays Streamed Through Earth’s Atmosphere 41,000 Years Ago
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Posted inSpace Weather & Heliophysics
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