2-D Maps of HDO on Mars for LS = 50O

Details 2-D Maps of HDO on Mars for LS = 50O 2-D Maps of HDO on Mars for LS = 50O

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.4909n&link_type=abstract

American Astronomical Society, DPS meeting #41, #49.09

Astronomy and Astrophysics

Astronomy

Scientific paper

Observations of HDO in the Martian atmosphere were taken at NASA's IRTF using CSHELL on March 26, 2008 when Mars was at Ls=50o. 2-D maps of the column density of HDO were extracted from individual spectral lines near 3.67 microns. The slit was positioned N-S on Mars. With the slit centered at the central meridian longitude (9:40 AM local time), data were taken from 2:00 - 6:00 UT producing spectral/spatial images. During this time, the slit was first centered on the Tharsis region and finished at Arcadia Planitia. Column densities were extracted at 0.6 arc-second intervals along the slit and analyzed with models created from GENLN2 atmospheric software; the models include solar Fraunhofer lines, a two-way transmission through Mars’ atmosphere, thermal emission from Mars’ surface and atmosphere, and a one way transmission through the Earth's atmosphere. From these, we constructed a 2-D map for the observable latitudes between 125 and 185 degrees West longitude for local time 9:40. The results show a dependence of HDO zenith column density on surface altitude and latitude
From 6:00 to 8:30 UT, we stepped the slit across the planet at 1.0 arcsec intervals in the E-W direction (diameter of Mars 7.3 arcsec). From these data, we constructed a 2-D map of HDO for positions centered at 205o W longitude and spanning local times from 8:00 AM to 4:00 PM. A diurnal variation of HDO column density is shown. H2O was mapped nearly simultaneously, and the combined maps reveal variations in the D/H ratio.
This work was partially funded by grants from NSF RUI Program (AST-0505765 and AST-0805540). We acknowledge the NASA-IRTF for observing time.

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