JWST Could Infer Exoplanet Biosignature Gas Fluxes

This research introduces a novel approach to exoplanet biosignature detection, shifting the focus from atmospheric gas abundances to surface fluxes. By inverting a coupled photochemical-climate model, the method aims to provide a more robust indicator of life. The application to a synthetic JWST spectrum of TRAPPIST-1 e demonstrates the potential of this technique, particularly in constraining methane fluxes. However, the accuracy of the inferred fluxes is contingent on the fidelity of the forward model and the availability of accurate stellar spectra, especially in the near-UV range. This highlights the need for comprehensive data and refined models to enhance the reliability of biosignature detection. The implications for future exoplanet missions, such as the Habitable Worlds Observatory, are significant, as this approach could improve the efficiency and accuracy of life detection efforts. The probabilistic assessment of life based on surface gas fluxes offers a more nuanced perspective compared to relying solely on atmospheric abundances, potentially leading to a more informed search for extraterrestrial life.

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