期刊
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
卷 713, 期 -, 页码 1-17出版社
ELSEVIER
DOI: 10.1016/j.physrep.2017.08.003
关键词
Exoplanet; Earth-like; Atmosphere; Biosignature
We review the field of exoplanetary biosignatures with a main focus upon atmospheric gas phase species. Due to the paucity of data in Earth-like planetary atmospheres a common approach is to extrapolate knowledge from the Solar System and Early Earth to Earth-like exoplanets. We therefore review the main processes (e.g. atmospheric photochemistry and transport) affecting the most commonly-considered species (e.g. O-2, O-3, N2O, CH4 etc.) in the context of the modern Earth, Early Earth, the Solar System and Earth-like exoplanets. We consider thereby known abiotic sources for these spqcies in the Solar System and beyond. We also discuss detectability issues related to atmospheric biosignature spectra such as band strength and uniqueness. Finally, we summarize current space agency roadmaps related to biosignature science in an exoplanet context. (C) 2017 Elsevier B.V. All rights reserved.
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