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Here we advocate an observational strategy to help prioritize exoplanetobservations. It starts with more easily obtained observational data, and ranksexoplanets for more difficult follow-up observations based on the likelihood ofavoiding planets for which oxygen is a false positives or even an inconclusivesignature of life. We find that for oxygen to be a robust biosignature, bothland and surface water must be present. Landless exoplanets have much slowerbiogeochemical cycles, so while oxygenic photosynthesizing life could exist onsuch planets, it could not produce oxygen at a rate competitive with abioticrates such as photolysis. These habitable planets, whose life would not bedetectable, should be avoided.

A procedure for observing rocky exoplanets to maximize the likelihood that atmospheric oxygen will be a biosignature