Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.3120a&link_type=abstract
American Astronomical Society, DPS meeting #40, #31.20; Bulletin of the American Astronomical Society, Vol. 40, p.450
Astronomy and Astrophysics
Astronomy
Scientific paper
We present analyses of Cassini CIRS far-infrared limb observations of Titan and report compelling spectral evidence for the ν6 HC3N ice feature at 505 cm-1, as well as a possible identification of the ν8 C4N2 ice feature at 478 cm-1. Condensed HC3N and C4N2 have not been observed on Titan since Voyager IRIS first disclosed these ice emission features at high northern latitudes in 1981. The condensate clouds are confined to a layer between 100 and 150 km in Titan's lower stratosphere, based on the HC3N and C4N2 saturation vapor pressure profiles, and appear to be restricted mainly to latitudes between 62N and 70N. Mie scattering calculations are performed to infer particle size and abundances of both ices, even in the absence of C4N2 vapor. We find mean radii of 2.13 μm and 4.58 μm for HC3N and C4N2 ice particles, respectively. This work is supported by the NASA Postdoctoral Program under the administration of Oak Ridge Associated Universities.
Achterberg Richard
Anderson Carrie
Bjoraker Gordon
Samuelson R.
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