Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...435..765b&link_type=abstract
Astronomy and Astrophysics, Volume 435, Issue 2, May IV 2005, pp.765-772
Astronomy and Astrophysics
Astrophysics
7
Planets And Satellites: Individual: Mars, Radio Lines: Solar System, Submillimeter
Scientific paper
The Odin satellite, thanks to the versatility of its receiver and spectrometer system, is well suited for the study of wide planetary submillimetre lines. In June and November 2003, the H2O line at 557 GHz was observed in the Mars atmosphere over a total bandwidth of 4 GHz. The wings of the line are detected up to the nearby continuum, which provides constraints on the disc-averaged vertical thermal profile and atmospheric water mixing ratio. In parallel, a sensitive search for the O2 line at 487 GHz was undertaken in June. This search was negative with a 3 σ upper limit of 4% on the absorption line depth, which is twice the expected signal. This observation, however, provides information on the continuum of Mars. In November the CO J(5-4) and the H218O lines were also detected in parallel and provide additional constraints on the temperature profile and mixing ratios. Surface water mixing ratios of 2{-}3×10-4 are inferred, corresponding to column densities in the range of 10-15 precipitable μm.
Baron Philippe
Biver Nicolas
Crovisier Jacques
Encrenaz Th.
Frisk Urban
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