Tentative DMS and DMDS Detections on K2-18b: A Cautious Path Toward Biosignature Claims

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Using the James Webb Space Telescope, astronomers detected tentative signs of dimethyl sulfide and dimethyl disulfide in the atmosphere of the rocky exoplanet K2-18b, but the result is only three-sigma and could arise from non-biological chemistry, so a five-sigma confirmation and ruling out abiotic sources are needed before any claim of life.

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Study finds three sigma probability of biological activity outside our solar system
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Study finds three sigma probability of biological activity outside our solar system

Using data from the James Webb Space Telescope (JWST), a group of astronomers has detected the chemical fingerprints of dimethyl sulfide (DMS) and dimethyl disulfide (DMDS) in the atmosphere of exoplanet K2-18b, which orbits its star in the habitable zone. The detection has been published in The Astrophysical Journal Letters.