![Retrieved emission spectra (blue regions) plotted with the true planet’s flux from our forward model (red) for each redox state considered (IW-6 to IW+6). The retrieved spectra denser region represents the 1𝜎 confidence level, intermediate region 2𝜎, thin region the 3𝜎 level. The observational noise from LIFEsim is shown as a gray envelope. The retrieved spectra capture most spectral features in observed planets, especially in the more pronounced oxidised cases (bottom row). -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/Characterizing-the.png?resize=1200%2C720&ssl=1)
[astro-ph.EP] The oxidation state of rocky exoplanets is expected to play a fundamental role in shaping the chemical composition of their secondary atmospheres by influencing the chemical composition of volcanically […]
atmosphere
![Stellar influence on planetary habitability. Figure credit: solar images from NASA/ESA and KPNO/NSO/AURA/NSF, background pictures generated through OpenAI’s image-generation system (i.e., Adobe Firefly and ChatGPT Images 2.0). Illustration: K. Herbst - [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/StellarActivity.jpg?resize=1200%2C720&ssl=1)
Posted inHabitable Zones
Stellar Activity, Exoplanet, Habitability, Planetary Atmospheres
[astro-ph.EP] This chapter will review the deep connection of planetary habitability and stellar irradiation. We present the long-term stellar evolution as one of the drivers of atmospheric escape and climate […]
Posted inSETI & Technosignatures
Nondetection of Narrowband Radio Technosignatures from LHS 1140 b at 1–12 GHz
[Research Notes of the AAS] LHS 1140b, a rocky exoplanet in its host star’s habitable zone, was recently shown to have an escaping helium atmosphere.
![Geometrical and structural layout of the 12-km-thick Martian atmosphere and the 2-m-thick Martian regolith in GEANT4 simulations.-- [physics.ins-det]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Unveiling.png?resize=1200%2C718&ssl=1)
Posted inMars
Unveiling Neutron And Gamma Spectrum At Martian Surface In Presence And Absence Of Hydrogen: A Computational Study Based On GEANT4 Simulations
[physics.ins-det] Motivated by the interactions of the GCR protons with the Martian atmosphere and regolith in the absence and presence of hydrogen, a series of GEANT4 simulations are employed in […]
Posted inExoplanets, -moons, -comets
SCoRE: The Surface Composition Of Rocky Exoplanets
[astro-ph.EP] Context. The crust composition of rocky exoplanets with a substantial atmosphere can not be observed directly. However, recent developments are starting to allow for the observation and characterisation of […]
Posted inExoplanets, -moons, -comets
Atmospheric Escape Rates of Planets in Stellar Tidal Fields from 3-D Hydrodynamic Simulations
[astro-ph.EP] Thermally driven atmospheric escape, including photo-evaporation and core-powered mass-loss, plays a key role in shaping the evolution of close-in exoplanets, yet most current models rely on simplified one-dimensional descriptions […]
Posted inAstronomy & Telescopes
ANDES, The High-resolution Spectrograph Oof The ELT: Simulated Performance Of The CORO Module And Overview Of The High-contrast Capabilities For Exoplanet Observations
[astro-ph.IM] We present the simulated performance of the coronagraph (CORO) module for ANDES, the Extremely Large Telescope (ELT) high-resolution spectrograph.
Posted inExoplanets, -moons, -comets
Detecting Habitable Exoplanet Atmospheres With LIFE, The Large Interferometer For Exoplanets
[astro-ph.IM] A key goal of astronomers with the next generation telescopes is to detect signs of life in exoplanet atmospheres. NASA’s next flagship is the Habitable Worlds Observatory (HWO).
Posted inBiogeochemical Cycles & Geobiology
Fire And Ice: Were Yellowstone’s Past Volcanic Eruptions And Glaciations Related?
[USGS/Yellowstone Volcano Observatory] Yellowstone is a land of fire and ice. Not only does it have a history of different styles of volcanic eruptions, but it has also been covered […]
Posted inMars
First Study Hints Solar Storms May Alter The Weather During Martian Dust Storms
[Royal Astronomical Society] Solar storms may affect weather on Mars when they strike at the same time as major Martian dust storms, a new study has suggested for the first […]