Potential Biosignatures on K2-18b
In 2023, researchers reported detections of dimethyl sulfide and methane in K2-18b's atmosphere using JWST data. On Earth, dimethyl sulfide is primarily produced by marine life, making it a potential biosignature. However, scientists stress that abiotic processes could also explain these molecules, and further observations are needed to confirm any biological source.
Why K2-18b Matters for Habitability Research
K2-18b's position in its star's habitable zone and the presence of water vapor and hydrogen-rich atmosphere make it a key target for studying potentially life-supporting worlds. While it is not Earth-like, its size and temperature range allow for liquid water under certain conditions. Ongoing JWST studies aim to refine atmospheric models and search for additional biosignatures.
