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An Overview of Exoplanet Biosignatures

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arxiv 2404.15431 v1 pith:6P3UFGZM submitted 2024-04-23 astro-ph.EP astro-ph.SRphysics.geo-ph

classification astro-ph.EPastro-ph.SRphysics.geo-ph
keywords biosignaturesatmosphericexoplanetfeaturesreviewsabioticarticlesassessing
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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

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. The Physics of Life: Exploring Information as a Distinctive Feature of Living Systems

    cond-mat.soft 2025-01 unverdicted novelty 2.0 of 10

    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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