![Log–log relation between age and rotation period for M dwarfs. Black squares show the Engle & Guinan (2023) sample. Filled circles are cluster members from Curtis et al. (2020) and Godoy-Rivera et al. (2021), colour-coded by spectral type (M2–M6). The solid blue curve is the median fit. Dark- and light-grey bands denote the 68% and 95% posterior predictive regions, including intrinsic astrophysical scatter. Triangles with error bars indicate the target stars analysed in this work. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/09/Stellar.png?resize=1200%2C720&ssl=1)
[astro-ph.EP] Measuring M dwarf ages is a central challenge in stellar astrophysics. These stars evolve so slowly that isochrone fitting gives little constraint, requiring alternative methods based on rotation, activity, […]
temperate sub-Neptune
Posted inExoplanets, -moons, -comets
Transmission Spectrum of the Benchmark Temperate Exo-Neptune TOI-1231 b
[astro-ph.EP] The JWST is revolutionizing our understanding of the temperate sub-Neptune population through atmospheric spectroscopy.
Posted inAtmospheres, Climate, Weather, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report, Water/Hycean Worlds & Oceanography
Ultraviolet Radiation Effects on the Optical Properties of Water-Dominated Exoplanet Hazes
Temperate sub-Neptune and terrestrial exoplanets could contain large inventories of water in various phases, such as water-dominated atmospheres or even oceans. Observations have shown that many exoplanets, including water worlds, […]
Posted inAriel Mission, Astronomy & Telescopes, Atmospheres, Climate, Weather, Biosignatures & Paleobiology, Habitable Zones, Imaging & Spectroscopy, Status Report
On The Information Content of Ariel Transmission Spectra: Reassessing The Tier System
The European Space Agency’s Ariel mission will conduct a survey of the atmospheric properties of exoplanets around bright stars.