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Inferring chemical ...
Inferring chemical disequilibrium biosignatures for Proterozoic Earth-like exoplanets
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- Young, Amber V. (författare)
- No Arizona Univ, Dept Astron & Planetary Sci, Flagstaff, AZ 86011 USA.
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- Robinson, Tyler D. (författare)
- Univ Arizona, Lunar & Planetary Lab, Tucson, AZ USA.
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- Krissansen-Totton, Joshua (författare)
- Univ Washington Earth & Space Sci, Seattle, WA USA.
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- Schwieterman, Edward W. (författare)
- Univ Calif Riverside, Dept Earth & Planetary Sci, Riverside, CA USA.
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- Wogan, Nicholas F. (författare)
- NASA Ames Res Ctr, Space Sci Div, Moffett Field, CA USA.
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- Way, Michael J. (författare)
- Uppsala universitet,Teoretisk astrofysik,NASA Goddard Inst Space Studies, New York, NY USA.
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- Sohl, Linda E. (författare)
- NASA Goddard Inst Space Studies, New York, NY USA.;Columbia Univ, Ctr Climate Syst Res, New York, NY USA.
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- Arney, Giada N. (författare)
- NASA Goddard Space Flight Ctr, Greenbelt, MD USA.
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- Reinhard, Christopher T. (författare)
- Georgia Tech, Earth & Atmospher Sci, Atlanta, GA USA.
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- Line, Michael R. (författare)
- Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ USA.
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- Catling, David C. (författare)
- Univ Washington Earth & Space Sci, Seattle, WA USA.;Univ Washington, Astrobiol Program, Seattle, WA USA.
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- Windsor, James D. (författare)
- No Arizona Univ, Dept Astron & Planetary Sci, Flagstaff, AZ 86011 USA.
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No Arizona Univ, Dept Astron & Planetary Sci, Flagstaff, AZ 86011 USA Univ Arizona, Lunar & Planetary Lab, Tucson, AZ USA. (creator_code:org_t)
- Springer Nature, 2024
- 2024
- Engelska.
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Ingår i: Nature Astronomy. - : Springer Nature. - 2397-3366. ; 8, s. 101-110
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- Chemical disequilibrium quantified using the available free energy has previously been proposed as a potential biosignature. However, researchers remotely sensing exoplanet biosignatures have not yet investigated how observational uncertainties impact the ability to infer a life-generated available free energy. We pair an atmospheric retrieval tool to a thermodynamics model to assess the detectability of chemical disequilibrium signatures of Earth-like exoplanets, focusing on the Proterozoic eon when the atmospheric abundances of oxygen-methane disequilibrium pairs may have been relatively high. Retrieval model studies applied across a range of gas abundances revealed that order-of-magnitude constraints on the disequilibrium energy are achieved with simulated reflected-light observations for the high-abundance scenario and high signal-to-noise ratios (50), whereas weak constraints are found for moderate signal-to-noise ratios (20-30) and medium- to low-abundance cases. Furthermore, the disequilibrium-energy constraints are improved by using the modest thermal information encoded in water vapour opacities at optical and near-infrared wavelengths. These results highlight how remotely detecting chemical disequilibrium biosignatures can be a useful and metabolism-agnostic approach to biosignature detection. Chemical disequilibrium is a known biosignature, and it is important to determine the conditions for its remote detection. A thermodynamical model coupled with atmospheric retrieval shows that a disequilibrium can be inferred for a Proterozoic Earth-like exoplanet in reflected light at a high O2/CH4 abundance case and signal-to-noise ratio of 50.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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Young, Amber V.
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Robinson, Tyler ...
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Krissansen-Totto ...
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Schwieterman, Ed ...
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Wogan, Nicholas ...
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Way, Michael J.
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visa fler...
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Sohl, Linda E.
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Arney, Giada N.
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Reinhard, Christ ...
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Line, Michael R.
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Catling, David C ...
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Windsor, James D ...
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