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An Overview of Exoplanet Biosignatures
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abstract
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$_2$O, DMS, CH$_3$Cl, C$_5$H$_8$, 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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Cited by 1 Pith paper
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The Physics of Life: Exploring Information as a Distinctive Feature of Living Systems
The paper argues that semantic information use distinguishes living from non-living systems and proposes implications for origin-of-life research and astrobiological biosignatures.
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