Journal
ASTRONOMY & ASTROPHYSICS
Volume 649, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202140868
Keywords
planets and satellites: atmospheres; planets and satellites: composition; planets and satellites: terrestrial planets; planets and satellites: detection
Categories
Funding
- Roscosmos
- UK Space Agency [ST/T002069/1, ST/V002295/1]
- Ministry of Science and Education of Russia
- National Centre for Space Studies of France (CNES)
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Phosphine and methane are proposed as possible biomarkers in planetary atmospheres, with methane observations reported in the atmosphere of Mars multiple times. However, the signature of phosphine has not been observed in the Martian atmosphere.
Phosphine (PH3) is proposed to be a possible biomarker in planetary atmospheres and has been claimed to have been observed in the atmosphere of Venus, sparking interest in the habitability of Venus's atmosphere. Observations of another biomarker, methane (CH4), have been reported several times in the atmosphere of Mars, hinting at the possibility of a past or present biosphere. The Atmospheric Chemistry Suite on the ExoMars Trace Gas Orbiter has a spectral range that includes several absorption lines of PH3 with line strengths comparable to previously observed CH4 lines. The signature of PH3 was not observed in the 192 observations made over a full Martian year of observations, and here we report upper limits of 0.1-0.6 ppbv.
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