WINERED Detects a Strong Atmospheric Outflow on the Sub-Neptune GJ 3090b

arXiv:2609.14704 · astro-ph.EP · Submitted 2026-09-13 · Read on arXiv

astro-ph.EP

Submitted: 2026-09-13

Updated: 2026-09-13

Comments: 17 pages, 5 figures, 2 tables, submitted to ApJL

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Metallicity — 16× in this paper · explained in 3 episodes
• Core — 11× in this paper · explained in 2 episodes
• Trace — 4× in this paper · explained in 2 episodes
• Transmission spectroscopy — 4× in this paper · explained in 2 episodes
• Degeneracy — 3× in this paper · explained in 3 episodes
• Abundance — 2× in this paper · explained in 1 episode
• Adam — 2× in this paper · explained in 2 episodes
• SHOTerm Gaussian Process — 1× in this paper
• Society of Photo-Optical Instrumentation Engineers — 1× in this paper

Sources

• JWST Reveals CH$_4$, CO$_2$, and H$_2$O in a Metal-rich Miscible Atmosphere on a Two-Earth-Radius Exoplanet
• No Helium Detected in LHS 1140 b from Four JWST NIRISS/SOSS Transits
• An Oxidation Gradient Straddling the Small Planet Radius Valley
• Helium escaping from the atmosphere of a nearby rocky exoplanet orbiting in a habitable zone
• TOI-421 b: A Hot Sub-Neptune with a Haze-Free, Low Mean Molecular Weight Atmosphere
• The 2017 Release of Cloudy
• The Fate of Hydrogen and Helium: From Planetary Embryos to Earth- and Neptune-like Worlds
• The Gradient of Mean Molecular Weight Across the Radius Valley
• Metal-Enriched Atmospheres in Warm (Super- and Sub-)Neptunes Induced by Extreme Atmospheric Escape
• Characterizing the bolometric-photoevaporative transition in young sub-Neptunes with radiation-hydrodynamic simulations
• Strict Limits on Helium Absorption from LHS 1140 b from Four JWST NIRISS Transits
• Hydrogen and Helium Dissolution, Outgassing, and Loss in Evolving Sub-Neptune Magma Oceans: Examining Demographic Features and Radius Evolution
• JWST COMPASS: NIRSpec/G395H Transmission Observations of TOI-776 c, a 2 Rearth M Dwarf Planet
• Water-Cooled (sub)-Neptunes Get Better Gas Mileage

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