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Atmospheric disequilibrium as an exoplanet biosignature: Opportunities for next generation telescopes

Published onMay 31, 2019
Atmospheric disequilibrium as an exoplanet biosignature: Opportunities for next generation telescopes
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Abstract

We explore atmospheric chemical disequilibrium as an exoplanet biosignature and argue that a CH4+CO2 combination could be a common sign of life on planets with oxygen-free atmospheres such as the ancient Earth. This biosignature combination is potentially detectable with JWST and readily detectable with some next generation space-based telescopes.

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