Journal
PLANETARY AND SPACE SCIENCE
Volume 59, Issue 2-3, Pages 299-303Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pss.2010.08.023
Keywords
Astrobiology; Mars; Methane; Laser absorption spectroscopy; Mars Science Laboratory; Methyl mercaptan
Categories
Funding
- MSL
- Icy Worlds node of NASA's Astrobiology Institute [08-NAI5-0021]
- NASA
- Caltech
- National Aeronautics and Space Administration
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As universal products of biological processes, volatile organic sulfur compounds such as methyl mercaptan (CH3SH) may be essential in the search for signs of life on Mars and in exoplanet atmospheres. Methyl mercaptan is implicated in the origin of life at sites of low-temperature hydrothermal activity driven by serpentinization. Serpentinization may occur on Mars, in icy satellite oceans, and in other small wet bodies to a greater extent than on Earth, with important implications for life. We characterized absorption features in pure laboratory sample spectra of CH3SH using the Carbon Isotope Laser Spectrometer (CILS), an infrared (3.27 mu m) tunable diode laser spectrometer with capabilities nearly identical to those of the Tunable Laser Spectrometer (TLS) instrument on the Mars Science Laboratory. The molecular species proves detectable by CILS and TLS at the sensitivities approaching the level of parts per trillion with pre-concentration. These measurements demonstrate the possibility for detection of methyl mercaptan, with implications for its possible use as an in situ biosignature for Earth-based and extraterrestrial exploration. Published by Elsevier Ltd.
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