Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...539l.143g&link_type=abstract
The Astrophysical Journal, Volume 539, Issue 2, pp. L143-L146.
Astronomy and Astrophysics
Astronomy
25
Planets And Satellites: Individual: Mars, Radio Lines: Solar System, Submillimeter
Scientific paper
We report the first detections of absorption features in the submillimeter spectrum of Mars that are due to the H2O (110-101) and 13CO (5-4) rotational transitions. Observations were obtained over several days near the planet's closest approach to Earth in 1999 April. These observations simultaneously provide us with an opportunity to derive the atmospheric temperature structure and to measure directly the distribution of water vapor with altitude. The Martian atmosphere is found to be relatively cool, consistent with results found from ground-based millimeter observations of CO. The distribution of water in the Martian atmosphere matches a profile of constant, 100% saturation from 10 to 45 km altitude.
Ashby Matthew L. N.
Bergin Edwin A.
Chin Gordon
Erickson Neal R.
Goldsmith Paul F.
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