Atmosphere of K2-18 b shows strong methane detection but no clear evidence of CO₂ or dimethyl sulfide

31. 1. 2025

Atmosphere of K2-18 b shows strong methane detection but no clear evidence of CO₂ or dimethyl sulfide

Star system: K2-18 | Distance from the Sun: 124 light years

These findings contradict claims of a liquid water ocean or life signs. The planet is likely an oxygen-poor sub-Neptune.

Generated by LLM, corrected by human

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Scientific study

A Comprehensive Reanalysis of K2-18 b's JWST NIRISS+NIRSpec Transmission Spectrum external link

Stars mentioned

K2-18

M2.8, Red dwarf

mass: 0.41 M☉

radius: 0.3 R☉

distance: 124 ly

stars in the system: 1

exoplanets: 2

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