Oxygen’s 2.4 billion year control on Earth’s atmosphere with consequences for exoplanet biosignatures

Gregory Cooke - University of LeedsApr 1, 2021
Atmospheric characterization
Habitability & Biosignatures
Future missions & Observatories
Biosignature false negatives
Atmospheric oxygenation
Atmospheric chemistry
Transmission spectra
Since the Great Oxidation Event approximately 2.4 billion years ago, oxygen (O₂) concentrations have fluctuated until reaching modern day levels, with O₂ now comprising 21% of the atmosphere. Given the geological history of terrestrial bodies in the solar system, telescopes will likely find an exoplanet in a particular geological regime, ...
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