Biosignatures & Paleobiology

A Review of Exoplanetary Biosignatures

By Keith Cowing
Press Release
October 11, 2017
Filed under
A Review of Exoplanetary Biosignatures
Habitable planet

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. O2, O3, 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 species 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.

John Lee Grenfell
(Submitted on 11 Oct 2017)

Comments: 28 pages
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Cite as: arXiv:1710.03976 [astro-ph.EP] (or arXiv:1710.03976v1 [astro-ph.EP] for this version)
Submission history
From: John Lee Grenfell
[v1] Wed, 11 Oct 2017 09:33:13 GMT (361kb)

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻