Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..520v&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.520
Physics
Scientific paper
We constrained the spectral dependence of the imaginary index of Titan's aerosol in the thermal infrared spectral range (100 - 1500 cm-1, 100 - 6.7 microns). We used the observed aerosol opacity derived from Cassini/CIRS data [7] and assumed that it is due to fractal particles of 3000 monomers, as observed by Huygens/DISR [6]. By using an algorithm calculating the extinction cross section of a fractal particle, developed by [1, 5], we were able to constrain the spectral dependence of the aerosol imaginary index. We show that the aerosol imaginary index in the midand far-infrared ranges globally differs from that of tholins, the Titan aerosol analogues produced in the laboratory, and particularly from that of [2], which is the refractive index commonly used in models. Nevertheless, the imaginary index of Titan's aerosol shows some absorption signatures that are seen in some tholin spectra like for instance at 1380 cm-1, which could be due to the presence of C-CH3 and/or C-(CH3)2 groups [4].
Anderson Martha C.
Bezard Bruno
de Kok Remco
Rannou Philippe
Samuelson Robert E.
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