Ocean salinity and planetary obliquity synergize via ice-albedo feedback to produce distinct climate states and enhanced habitability on cold exo-Earths in ROCKE-3D simulations.
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K., Ramirez, R., Kasting, J
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Splitting biosignature survey targets into two groups with different life prevalences but a shared global confounder rate allows modest-sized surveys to produce strong evidence for life under fully agnostic priors.
Early Venus experienced large seasonal and latitudinal insolation redistribution but only modest orbit-averaged flux changes, making atmospheric opacity the dominant control on surface temperature rather than orbital forcing.
In 1D N2-CO2-H2O model atmospheres, increasing background N2 pressure warms the climate under low CO2 via H2O dilution and under high CO2 via H2O loading, while high N2 induces cooling via Rayleigh scattering that can be overwhelmed by enhanced H2O absorption.
A tiered observational strategy is outlined to identify planetary-scale broadband radio technosignatures (BRaTs) from advanced civilizations up to 100 pc away using multi-parameter diagnostics to separate them from natural signals.
Sustained mass transfer from a circumbinary disc enables giant planet formation in gamma-Cephei-like binaries by prolonging the lifetime of the circumprimary disc against truncation and photoevaporation.
Joint radial-velocity analysis revises GJ 3378b's period to 21.45 days and minimum mass to 2.3 Earth masses, placing the habitable-zone planet near the cosmic shoreline.
A non-transiting temperate super-Earth Ross 318 b with 39.63-day period and 6.21 Earth-mass minimum is detected around the magnetically active M3.5V star Ross 318 via radial velocities and confirmed absent in TESS transit searches.
LIFE can constrain atmospheric H2O abundances from roughly 10^{-3} to 1 bar surface pressure on Earth-like exoplanets for certain vertical profiles, providing a potential proxy for surface oceans, but cannot detect water below 10^{-6} bar or precisely characterize the highest abundances.
The HAges catalog compiles published asteroseismic and gyrochronological ages for 659 HWO target stars, finding that only ~5% have asteroseismic ages and ~20% have gyrochronal ages.
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The HAges Catalog: Stellar Ages for High Priority HWO Target Stars
The HAges catalog compiles published asteroseismic and gyrochronological ages for 659 HWO target stars, finding that only ~5% have asteroseismic ages and ~20% have gyrochronal ages.