Computer Science – Sound
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.3006b&link_type=abstract
American Astronomical Society, DPS meeting #41, #30.06
Computer Science
Sound
Scientific paper
Titan's atmosphere mainly made of nitrogen and methane is rich in organic molecules. Hydrocarbons are formed from the photolytic dissociation of CH4 and nitriles are created by dissociation of N2 followed by reactions with hydrocarbons. In order to understand the physicochemical mechanisms responsible for the evolution of Titan's atmosphere, photochemical models are built. The latter need constrains for vertical profiles of organic compounds from the high thermosphere down to the low stratosphere as well as photodissociation rates.
Those profiles over the entire atmosphere can be retrieved from Cassini observations, in particular by limb sounding, coupling infrared and ultraviolet spectroscopy. However, in order to interpret those data obtained by the ultraviolet (UVIS) and infrared (CIRS) spectrometers on board Cassini's spacecraft, precise spectroscopic parameters and their dependence on temperature are needed.
We will review the current knowledge in this field of planetary spectroscopy and point out the lack of spectroscopic parameters of already detected species, especially for radiative transfer calculations at low temperature. We will focus our talk on the Cyanogen molecule (C2N2) which has been observed in Titan atmosphere in the FIR domain around 230 cm-1.
We will present the latest spectroscopic studies we have performed on this molecule. Those studies cover the entire spectrum from the mid- infrared and to the vacuum ultraviolet. Integrated band intensities have been determined for all bands in the infrared. In the ultraviolet domain, we have determined absolute cross sections from 350 down to 80 nm covering six orders of magnitude absorptions.
We will also show how temperature can influence VUV absorption coefficients and the implications on the interpretation of UVIS observations.
Benilan Yves
Fray Nicolas
Gazeau Maxime
Guillemin J.
Jolly Alison
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