The Search for Methane on Mars with NIRSPEC: Preliminary Results from the 2009-2010 Observing Campaign

Details The Search for Methane on Mars with NIRSPEC: Preliminary Results from the 2009-2010 Observing Campaign The Search for Methane on Mars with NIRSPEC: Preliminary Results from the 2009-2010 Observing Campaign

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf...24r&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.24

Physics

Scientific paper

In this work, we present high-resolution infrared spectra of Mars, acquired in 2009 and 2010, with the Near Infrared Echelle Spectrograph (resolving power ~ 35,000), on the Keck II telescope. The time interval of NIRSPEC observations corresponds to Ls = 8 - 83 , early through late spring in the Martian Northern hemisphere. We searched for methane by creating maps of Mars with the slit fixed in the North-South position as the planet rotates, and also by stepping the slit along the East-West direction, thereby acquiring diurnal information. We detect multiple lines of H2O and CO2 in the 3.3 m region, and discuss possible indication of CH4 in the positions of the R0 and R1 lines, on Dec. 1, 2009 (Ls = 17.5 ; Doppler shift = -13.4 km s-1; Angular diameter of Mars = 9.9 ; 44 minutes on source), as well as residual features in the positions of the P2, P3 and P4 lines on Dec. 2, 2009 (Ls = 17.9 ; Doppler shift = -13.5 km s-1; Angular diameter of Mars = 10.0 ; 76 minutes of maps along the planet). We present spatially resolved spectra of Mars and discuss the implications of methane variability.

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