An Overview of Exoplanet Biosignatures
arxiv(2024)
摘要
This chapter reviews proposed exoplanet biosignatures, including their
biological origins, observable features, atmospheric sinks, and potentially
confounding abiotic sources. Emphasis is placed on material published since
past comprehensive reviews while providing a foundational understanding of each
named biosignature. Topics include possible gaseous biosignatures (e.g., O_2,
O_3, CH_4, N_2O, DMS, CH_3Cl, C_5H_8, NH_3, PH_3), surface
biosignatures (e.g., vegetation red edge, other pigment features, polarization
signatures), and temporal biosignatures (e.g., atmospheric seasonality).
Potential frameworks for assessing remote biosignatures are described. Text and
table summaries provide references to relevant original research articles.
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