Potential exoplanet pseudo-biosignatures

Details Potential exoplanet pseudo-biosignatures Potential exoplanet pseudo-biosignatures

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spie.8152e...6k&link_type=abstract

Instruments, Methods, and Missions for Astrobiology XIV. Edited by Hoover, Richard B.; Davies, Paul C. W.; Levin, Gilbert V.; R

Biology

Scientific paper

Over 500 exoplanets have been discovered so far, some being rocky, terrestrial planets. Advancing instrumentation permits spectroscopic examination of their atmospheres, and remote detection of potential of biogenic gases. Of particular interest are oxygen and methane, although other gases are considered. Short residence time of these gases implies continued renewal. Abiotic sources are considered at levels that could be misinterpreted as a pseudobiosignature. Photodissociation of water molecules, for example, could produce an oxygen pseudo-biosignature, although generally at low levels. However, large-scale water loss events, as are thought to have occurred on Venus and Mars, could produce a substantial pseudo-biosignature.

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