Exoplanet biosignatures: future directions

Walker, S. I. et al. (2018) Exoplanet biosignatures: future directions. Astrobiology, 18(6), pp. 779-824. (doi: 10.1089/ast.2017.1738) (PMID:29938538) (PMCID:PMC6016573)

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We introduce a Bayesian method for guiding future directions for detection of life on exoplanets. We describe empirical and theoretical work necessary to place constraints on the relevant likelihoods, including those emerging from better understanding stellar environment, planetary climate and geophysics, geochemical cycling, the universalities of physics and chemistry, the contingencies of evolutionary history, the properties of life as an emergent complex system, and the mechanisms driving the emergence of life. We provide examples for how the Bayesian formalism could guide future search strategies, including determining observations to prioritize or deciding between targeted searches or larger lower resolution surveys to generate ensemble statistics and address how a Bayesian methodology could constrain the prior probability of life with or without a positive detection.

Item Type:Articles
Additional Information:E.W.S. is grateful for support from the NASA Postdoctoral Program, administered by the Universities Space Research Association. S.D. was supported by NASA Exobiology grant NNX15AM07G. S.I.W. and H.B.S were supported by NASA Exobiology grant NNX15AL24G. This work benefitted from collaborations and/or information exchange within NASA’s Nexus for Exoplanet System Science (NExSS) research co- ordination network sponsored by NASA’s Science Mission Directorate.
Glasgow Author(s) Enlighten ID:Cronin, Professor Lee
Authors: Walker, S. I., Bains, W., Cronin, L., DasSarma, S., Danielache, S., Domagal-Goldman, S., Kacar, B., Kiang, N. Y., Lenardic, A., Reinhard, C. T., Moore, W., Schwieterman, E. W., Shkolnik, E. L., and Smith, H. B.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Astrobiology
Publisher:Mary Ann Liebert
ISSN (Online):1557-8070
Published Online:01 June 2018
Copyright Holders:Copyright © 2018 Sara I. Walker et al.
First Published:First published in Astrobiology 18(6):779-824
Publisher Policy:Reproduced under a Creative Commons License

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