Publication Abstracts
Schwieterman et al. 2018
Schwieterman, W.,
, M.N. Parenteau, C.E. Harman, S. DasSarma, T.M. Fisher, G.N. Arney, H.E. Hartnett, C.T. Reinhard, S.L. Olson, V.S. Meadows, C.S. Cockell, S.I. Walker, J.L. Grenfell, S. Hegde, S. Rugheimer, R. Hu, and T.W. Lyons, 2018: Exoplanet biosignatures: A review of remotely detectable signs of life. Astrobiology, 18, no. 6, 663-708, doi:10.1089/ast.2017.1729.In the coming years and decades, advanced space- and ground-based observatories will allow an unprecedented opportunity to probe the atmospheres and surfaces of potentially habitable exoplanets for signatures of life. Life on Earth, through its gaseous products and reflectance and scattering properties, has left its fingerprint on the spectrum of our planet. Aided by the universality of the laws of physics and chemistry, we turn to Earth's biosphere, both in the present and through geologic time, for analog signatures that will aid in the search for life elsewhere. Considering the insights gained from modern and ancient Earth, and the broader array of hypothetical exoplanet possibilities, we have compiled a comprehensive overview of our current understanding of potential exoplanet biosignatures, including gaseous, surface, and temporal biosignatures. We additionally survey biogenic spectral features that are well known in the specialist literature but have not yet been robustly vetted in the context of exoplanet biosignatures. We briefly review advances in assessing biosignature plausibility, including novel methods for determining chemical disequilibrium from remotely obtainable data and assessment tools for determining the minimum biomass required to maintain short-lived biogenic gases as atmospheric signatures. We focus particularly on advances made since the seminal review by Des Marais et al. The purpose of this work is not to propose new biosignature strategies, a goal left to companion articles in this series, but to review the current literature, draw meaningful connections between seemingly disparate areas, and clear the way for a path forward.
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BibTeX Citation
@article{sc06600o, author={Schwieterman, W. and Kiang, N. Y. and Parenteau, M. N. and Harman, C. E. and DasSarma, S. and Fisher, T. M. and Arney, G. N. and Hartnett, H. E. and Reinhard, C. T. and Olson, S. L. and Meadows, V. S. and Cockell, C. S. and Walker, S. I. and Grenfell, J. L. and Hegde, S. and Rugheimer, S. and Hu, R. and Lyons, T. W.}, title={Exoplanet biosignatures: A review of remotely detectable signs of life}, year={2018}, journal={Astrobiology}, volume={18}, number={6}, pages={663--708}, doi={10.1089/ast.2017.1729}, }
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RIS Citation
TY - JOUR ID - sc06600o AU - Schwieterman, W. AU - Kiang, N. Y. AU - Parenteau, M. N. AU - Harman, C. E. AU - DasSarma, S. AU - Fisher, T. M. AU - Arney, G. N. AU - Hartnett, H. E. AU - Reinhard, C. T. AU - Olson, S. L. AU - Meadows, V. S. AU - Cockell, C. S. AU - Walker, S. I. AU - Grenfell, J. L. AU - Hegde, S. AU - Rugheimer, S. AU - Hu, R. AU - Lyons, T. W. PY - 2018 TI - Exoplanet biosignatures: A review of remotely detectable signs of life JA - Astrobiology JO - Astrobiology VL - 18 IS - 6 SP - 663 EP - 708 DO - 10.1089/ast.2017.1729 ER -
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