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carbon monoxide and the potential for prebiotic chemistry on habitable planets around main sequence m starsLifeless planets with CO2 atmospheres produce CO by CO2 photolysis. On planets around M dwarfs, CO is a long-lived atmospheric compound, as long as UV emission due to the stars chromospheric activity lasts, and the sink of CO and O2 in seawater is small compared to its atmospheric production. Atmospheres containing reduced compounds, like CO, may undergo further energetic and chemical processing to give rise to organic compounds of potential importance for the origin of life. We calculated the yield of organic compounds from CO2-rich atmospheres of planets orbiting M dwarf stars, which were previously simulated by Domagal- Goldman et al. (2014) and Harman et al. (2015), by cosmic rays and lightning using results of experiments by Miyakawaet al. (2002) and Schlesinger and Miller (1983a, 1983b). Stellar protons from active stars may be important energy sources for abiotic synthesis and increase production rates of biological compounds by at least 2 orders of magnitude compared to cosmic rays. Simple compounds such as HCN and H2CO are more readily synthesized than more complex ones, such as amino acids and uracil (considered here as an example), resulting in higher yields for the former and lower yields for the latter. Electric discharges are most efficient when a reducing atmosphere is present. Nonetheless, atmospheres with high quantities of CO2 are capable of producing higher amounts of prebiotic compounds, given that CO is constantly produced in the atmosphere. Our results further support planetary systems around M dwarf stars as candidates for supporting life or its origin.
Document ID
20180001920
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Nava-Sedeno, J. Manik
(Technische Univ. Dresden, Germany)
Ortiz-Cervantes, Adrian
(Technische Univ. Dresden, Germany)
Segura, Antigona
(Universidad Nacional Autonoma de Mexico Mexico City, Mexico)
Domagal-Goldman, Shawn D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
March 15, 2018
Publication Date
October 4, 2016
Publication Information
Publication: Astrobiology
Volume: 16
Issue: 10
ISSN: 1531-1074
Subject Category
Lunar and Planetary Science and Exploration
Report/Patent Number
GSFC-E-DAA-TN40607
Distribution Limits
Public
Copyright
Other
Keywords
M stars
Carbon Monoxide
prebiotic chemistry