Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.2715l&link_type=abstract
American Astronomical Society, DPS meeting #38, #27.15; Bulletin of the American Astronomical Society, Vol. 38, p.530
Astronomy and Astrophysics
Astronomy
Scientific paper
The Cassini Ultraviolet Imaging Spectrometer (UVIS) occultation measurements for the atmosphere of Titan identified and measured eight species. Seven gaseous species, which were obtained previously, are nitrogen, methane, acetylene, ethylene, ethane, diacetylene, and hydrogen cyanide. However, to reproduce the UVIS spectra requires broad band absorption features. The introduction of tholin particles with radius 25 A provides a satisfactory fit to the spectra. This represents the first spectral identification of the aerosol in the mesosphere. Upper limits for benzene and dicyanodiacetylene are obtained. Photochemical modeling for the atmosphere is performed. The model results are in good agreement with the observations. We find that dicyanodiacetylene is condensible at 700 km, where the atmospheric temperature minimum is located. This species is by far the simplest molecule identified to be condensible. New observations are needed to confirm the existence of dicyanodiacetylene.
This work was supported in part by an NASA grant NAG5-6263 to the California Institute of Technology.
Liang Mao-Chang
Shemansky Donald
Yung Yuk
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