Publication Abstracts

Schwieterman et al. 2018

Schwieterman, W., N.Y. Kiang, 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

  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},

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RIS Citation

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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