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Science 24 June 1988:
Vol. 240. no. 4860, p. 1767
DOI: 10.1126/science.240.4860.1767
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Articles
Deuterium on Mars: The Abundance of HDO and the Value of D/H
Tobias Owen 1,
Jean Pierre Maillard 2,
Catherine de Bergh 3, and
Barry L. Lutz 4
1 Department of Earth and Space Sciences, State University of New York, Stony Brook, NY 11794
2 Institut d'Astrophysique de Paris, F-75014 Paris, France
3 Observatoire de Paris, 92195 Meudon, France
4 Lowell Observatory, Flagstaff, AZ 86001
Deuterium on Mars has been detected by the resolution of several Doppler-shifted lines ofHDO near 3.7 micrometers in the planet's spectrum. The ratio of deuterium to hydrogen is (9 ± 4) x 10-4; the abundance of H20 was derived from lines near 1.1 micrometers. This ratio is enriched on Mars over the teiluric value by a factor of6 ± 3. The enrichment implies that hydrogen escaped more rapidly from Mars in the past than it does now, consistent with a dense and warm ancient atmosphere on the planet.
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