Provisional Detection of DMS and DMDS in K2-18 b's Atmosphere from JWST Mid-Infrared Transit Data

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Led by Nikku Madhusudhan, JWST observations of the exoplanet K2-18 b show tentative detection of the gases dimethyl sulfide and dimethyl disulfide in its atmosphere at about 3 sigma (roughly 99.7% confidence), a result that could be one of the strongest potential biosignatures if confirmed but remains provisional and demands additional observations.

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Dimethyl Sulphide Identified as Potential Biosignature in Exoplanet Atmosphere
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Dimethyl Sulphide Identified as Potential Biosignature in Exoplanet Atmosphere

The exoplanet K2-18 was discovered in 2015 and has since emerged as one of the most promising candidates in the search for habitable worlds. This began in 2019, when observations suggested the presence of water vapor in its atmosphere, a key ingredient for life.