New JWST data robustly detect CH4 and CO2 in K2-18 b's atmosphere, indicating a water-rich interior; DMS, CH3SH, and N2O remain marginal, and abiotic organosulfur chemistry is a viable explanation.
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A water-rich interior in the temperate sub-Neptune K2-18 b revealed by JWST
New JWST data robustly detect CH4 and CO2 in K2-18 b's atmosphere, indicating a water-rich interior; DMS, CH3SH, and N2O remain marginal, and abiotic organosulfur chemistry is a viable explanation.