Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p11d..04m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P11D-04
Other
5410 Composition (1060, 3672), 5470 Surface Materials And Properties, 6281 Titan
Scientific paper
We have been systematically searching for spectroscopic evidence to identify surface materials remotely using data from the Cassini Visual and IR Mapping Spectrometer (VIMS) [McCord et al., Pl. and Sp. Sci., 54, 2006; McCord et al., Icarus, 194, 2008]. The Titan atmosphere allows viewing of the surface only in a few narrow spectral windows in the near IR due to methane absorptions, and atmospheric particulate scattering affects even these windows. We so far have found one weak absorption near 4.92 μm for a few regions (e.g. Tui Regio and Hotei Regio) that also have anomalous brightness in the 5 microns and contrast across the 2.8-μm windows. This evidence seems consistent with at least two materials, fine- grained CO2 frost and cyanoacetylene, HC3N, and is not consistent with some other materials proposed for Titan's surface. Further, we are able to model and map the entire Titan surface viewed by VIMS using all methane windows and spectral unmixing analysis methods, with only a few spectral end-member components, which include water ice, CO2 frost, a model of aerosol scattering and an unknown material bright at 2 microns. A neutral dark material may also be present. We continue this effort with each new VIMS data set and summarize here on our latest findings.
Combe J.
Hansen Gary B.
Hayne Paul
McCord Th. B.
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