Titan's Meridional Stratospheric Composition : CIRS Observations and Modelling

Details Titan's Meridional Stratospheric Composition : CIRS Observations and Modelling Titan's Meridional Stratospheric Composition : CIRS Observations and Modelling

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.3005c&link_type=abstract

American Astronomical Society, DPS meeting #41, #30.05

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present results obtained on Titan's chemical composition at the end of the prime Cassini-Huygens mission, by analyzing CIRS data in the far- and mid-IR region. With respect to previous publications [1,3,9,10] we improved our analysis by exploiting a considerably larger number of nadir spectra, in particular at high resolution (0.53 cm-1), allowing for the inference of more precise abundances and meridional variations, in particular in the northern regions. We have also included new spectroscopic data for C2H6, HCN, HC3N and C2HD in our model.
Molecules showing a significant enhancement at northern latitudes are the nitriles (HC3N, HCN) and the complex hydrocarbons (C4H2, C3H4). Acetylene and ethane also exhibit abundance increases by factors of 1.5-2. Isotopic ratios in carbon and nitrogen have been determined as per recent discoveries of these species [4,5,6]. The D/H ratio on Titan was also determined from the CH3D band at 8.6 micron and the C2HD band at 678 cm-1 [1]. We compare our results with previous inferences from earlier CIRS, Voyager1/IRIS and ISO data. The results are tied to predictions by dynamical-photochemical models [2,7,8 and references therein].
References
[1] Coustenis, A., et al., 2007, Icarus 189, 35-62 ; 2008 : Icarus 197, 539-548.
[2] Crespin et al., 2008. Icarus 197, 556-571.
[3] Flasar et al., 2005. Science 308, 975.
[4] Jennings et al., 2008. Astrophys. J. Let. 681, L109-L111.
[5] Nixon et al., 2008a. Icarus 195, 778-791.
[6] Nixon et al., 2008b. Astrophys. J. Let. 681, L101-L103.
[7] Lavvas, P. P., et al., 2008a. Plan. Space Sci. 56, 27-66 ; 2008b. Plan. Space Sci. 56, 67-99.
[8] Rannou, P., et al., 2005. Adv. Space Res. 36, 2194-2198.
[9] Teanby, N. A., et al., 2006. Icarus 181, 243-255; 2008. Icarus 193, 595-611.
[10] Vinatier, S., et al., 2007. Icarus 188, 120-138.

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