[astro-ph.EP] Radial velocity (RV) analyses require modelling choices (such as eccentricity treatment, noise model, velocity trends, and number of planets) that can significantly affect derived planetary masses.
atmosphere
Posted inAstrochemistry
Unveiling Complex Chemistry In Planet-forming Disks With The SKAO
[astro-ph.SR] The chemical composition of planets is inherited from that of the natal protoplanetary disk at the time of planet formation.
![Kiel diagram for 290 stars with 5000 K ≤ Teff ≤ 6500 K and log g ≥ 4.0 dex analyzed in this work. The dashed black lines present the solar values obtained for the Ceres 2009-02-08 solar spectrum, Teff = 5759±18 K, log g = 4.43±0.05 dex and [Fe/H] = 0.00±0.01 dex. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Chemical-Abundances.png?resize=1200%2C720&ssl=1)
Posted inAstrochemistry
Chemical Abundances of the Bioessential Elements C, O and S, and the Refractory Elements
[astro-ph.EP] We determined atmospheric and evolutionary parameters, along with chemical abundances of C, O, S, Fe, and Ni for 290 solar-type exoplanet hosting stars using high-resolution HARPS-North and HARPS-South spectra, […]
Posted inMars
Martian Dust Storms May Ggenerate Atmospheric Electrical Conditions That Could Impact Mars Missions
[UAH] A new study by a doctoral researcher at The University of Alabama in Huntsville (UAH), a part of The University of Alabama System, suggests global dust storms on Mars […]
Posted inExoplanets, -moons, -comets
C,N,O,S, And Photochemistry In A Temperate Giant Planet Orbiting A Late M Dwarf
[astro-ph.EP] We report the JWST NIRSpec/PRISM transit spectrum of TOI-6894b, an exceptional 420 K sub-Saturn that is the only known giant planet transiting a late M dwarf. Remarkably, both the […]
Posted inLava / magma ocean / Volcanic Worlds
Coupled AtmospHere Interior modeL Intercomparison (CHILI). I. Evolutionary Modelling — Primordial Magma Oceans of Earth and Venus
[astro-ph.EP] Earth and Venus represent two evolutionary outcomes arising from initially molten ‘magma ocean’ periods, followed by lifetimes of chemical and geophysical divergence. Their physics is common to all rocky […]
Posted inExoplanets, -moons, -comets
A New Earth-like Exoplanet Discovered
[UC Irvine] A team led by astronomers at the University of California, Irvine reports the discovery of a new Earth-like exoplanet orbiting a star about 25 light-years from our solar […]
Posted inVenus
A Panspermia Origin For Venus Cloud Life
[USRA] Panspermia is the idea that life can originate on one planetary body and then be transferred to other bodies. Impacts are often the suggested method for transfer, as they […]
Posted inHabitable Zones
Nautilus: Fast Time-Resolved Spectroscopy of GKM Stellar Flares and Their Implications for Planetary Habitability
[astro-ph.SR] Low-mass GKM dwarfs are prime targets for finding habitable-zone Earth-sized planets, but their frequent flares, especially on M~dwarfs, can strongly affect planetary atmospheres through enhanced UV/XUV radiation and stellar […]
Posted inExoplanets, -moons, -comets
Nautilus Space Observatory: The Evolution of Planets and their Atmospheres
[astro-ph.IM] We are just beginning to explore the billion-year evolution from nascent planets in disks to mature planetary systems. Recent discoveries hint at demographic and atmospheric differences between young planets […]