Other
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.5806k&link_type=abstract
American Astronomical Society, DPS meeting #42, #58.06; Bulletin of the American Astronomical Society, Vol. 42, p.1083
Other
Scientific paper
The Cassini UVIS archive contains several stellar occultations that probe the upper atmosphere of Titan between the impact parameters of 400 and 1400 km. Uniquely, this range includes the region between 500 and 1000 km that is believed to be the site of complex hydrocarbon photochemistry and possibly the growth of aerosols that form the detached haze layers below. In order to better characterize the number density profiles of the hydrocarbons and the properties of the aerosols in this region, we have reanalyzed the occultation of the star lambda Sco from December 2004 and begun the analysis of more recent occultations. Our analysis covers the wavelength range of 125 - 190 nm and impact parameters of 400 - 1400 km. We confirm the earlier detections of CH4, C2H6, C2H2, C2H4, and C4H2 in the transmission spectra. We also find evidence for two distinct absorbing layers in the data near 500 km and 750 km. We note that the extinction coefficients derived from the light curves appear to correlate with the temperature profile measured by the HASI instrument. The 500 km feature corresponds to the detached haze layer that was recently linked to a temperature maximum in the HASI profile but the properties of the 750 km feature are unknown. It is possible that this new feature is associated with another high altitude aerosol layer. We note, however, that the retrieval of the optical properties of the aerosols and thus the density and size distribution is complicated by the possible presence of higher order hydrocarbons such as C6H6 in the transmission spectra.
Benilan Yves
Capalbo F.
Koskinen Tommi T.
Lavvas Panayiotis
Sandel Bill R.
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