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Detection of O2 Produced Abiotically on Habitable but Lifeless Planets around M-dwarfs

Published online by Cambridge University Press:  29 April 2014

Tong Li  and
Feng Tian
Tong Li
Affiliation:
Ministry of Education Key Laboratory for Earth System Modeling, Center for Earth System Science, Tsinghua University, Beijing, China100084
Feng Tian
Affiliation:
Ministry of Education Key Laboratory for Earth System Modeling, Center for Earth System Science, Tsinghua University, Beijing, China100084
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Abstract

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High atmospheric abundances of oxygen has been widely considered to be a reliable biosignature for life on exoplanets in the habitable zones of all types of stars. Recently it was proposed that the unique UV spectra of observed planet-hosting M dwarfs could lead to the buildup of molecular oxygen in the atmospheres of habitable but lifeless planets around these stars (Tian et al. 2014). However, the detectability of the accumulated O2 was not modeled. In this work we developed a new line by line radiative transfer model based on HITRAN database and used the model to simulate the reflectivity in the visible and near IR range. We show that abiotically produced and maintained O2 in the 0.2% level is observable at 13105 cm−1 (0.76 μm) with the spectra resolution of 70.

Keywords

exoplanets: biosignaturesdetection: biosignaturesHabitability
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S293: Formation, Detection, and Characterization of Extrasolar Habitable Planets , August 2012 , pp. 39 - 45
Copyright
Copyright © International Astronomical Union 2014 

References

Des Marais, D. J.et al., Remote Sensing of Planetary Properties and Biosignatures on Extrasolar Terrestrial Planets. Astrobiology, 2, 153 (2002)Google Scholar
France, K.et al., The Ultraviolet Radiation Environment Around M dwarf Exoplanet Host Stars. ApJ, 763, 149 (2013)CrossRefGoogle Scholar
Grenfell, J. L.et al., Potential Biosignatures in Super-Earth Atmospheres II. Photochemical Responses. Astrobiology, 13, 415 (2013)Google Scholar
Hu, R., et al., Photochemistry In Terrestrial Exoplanet Atmospheres. I. Photochemistry Model And Benchmark Case. ApJ, 761, 166 (2012)CrossRefGoogle Scholar
Kaltenegger, L., Traub, W. A., Jucks, K. W., Spectral Evolution Of An Earth-Like Planet. ApJ, 658, 598 (2007)CrossRefGoogle Scholar
Kasting, J. F.et al., Oxygen levels in the prebiological atmosphere. J. Geoph. Res., 84, 3097 (1979)Google Scholar
Kasting, J. F., Pollack, J. B. & Crisp, D., Effects of high CO levels on surface temperature and atmospheric oxidation state of the early earth. J. Atmos. Chem., 1, 403 (1984)Google Scholar
Kasting, J. F., Bolide impacts and the oxidation state of carbon in the Earth's early atmosphere. Origins of Life, 20, 199 (1990)Google Scholar
Kasting, J. F., Early evolution of the atmosphere and ocean, in The Chemistry of Life's Origin (edited by Greenberg, J. M., Mendoza-Gomez, C. X. and Pirronello, V.). pp. 149–176. Kluwer. Dordrecht (1993)Google Scholar
Kasting, J. F., Earth's Early Atmosphere. Science, 259, 920 (1993)CrossRefGoogle ScholarPubMed
Kasting, J. F., O2 concentrations in dense primitive atmospheres: commentary. Planetary and Space Sciences, 43, 11 (1995)CrossRefGoogle ScholarPubMed
Kasting, J. F., Habitable zones around low mass stars and the search for extraterrestrial life. Origin of Life and Evolution of Biosphere, 27, 291 (1997)Google Scholar
Rosenqvist, J. & Chassefiere, E., Inorganic chemistry of O2 in a dense primitive atmosphere. Planetary and Space Sciences, 43, 3 (1995)CrossRefGoogle Scholar
Rothman, L. S.et al., The HITRAN 2008 molecular spectroscopic data base. Journal of Quantitative Spectroscopy & Radiative Transfer, 110 (2009) 533Google Scholar
Segura, A.et al., Ozone Concentrations and Ultraviolet Fluxes on Earth-Like Planets around Other Stars. Astrobiology, 3, 689 (2003)CrossRefGoogle ScholarPubMed
Segura, A.et al., Biosignatures from Earth-Like Planets Around M Dwarfs. Astrobiology, 5, 706 (2005)Google Scholar
Segura, A.et al., Abiotic formation of O2 and O3 in high-CO2 terrestrial atmospheres. A&A, 472, 665 (2007)Google Scholar
Selsis, F.et al., Signature of life on exoplanets: Can Darwin produce false positive detections? A&A, 388, 985 (2002)Google Scholar
Tian, F.et al., High Stellar FUV/NUV Ratio and Oxygen Contents in the Atmospheres of Potentially Habitable Planets. Earth and Planetary Science Letters, 22, 27 (2014)Google Scholar
Walker, J. C. G., Evolution of the Atmosphere (Macmillan, New York, 1977)Google Scholar