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Atmospheric carbon depletion as a tracer of water oceans and biomass on temperate terrestrial exoplanets - Nature Astronomy

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Atmospheric carbon depletion as a tracer of water oceans and biomass on temperate terrestrial exoplanets - Nature Astronomy

The conventional observables to identify a habitable or inhabited environment in exoplanets, such as an ocean glint or abundant atmospheric O2, will be challenging to detect with present or upcoming observatories. Here we suggest a new signature. A low carbon abundance in the atmosphere of a temperate rocky planet, relative to other planets of the same system, traces the presence of a substantial amount of liquid water, plate tectonics and/or biomass.

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Atmospheric carbon depletion as a tracer of water oceans and biomass on temperate terrestrial exoplanets - Nature Astronomy

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Atmospheric carbon depletion as a tracer of water oceans and biomass on temperate terrestrial exoplanets - Nature Astronomy

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