The evolution of infalling sulfur species in Titan's atmosphere

K. M. Hickson, J. C. Loison, T. Cavalié, E. Hébrard, M. Dobrijevic
2014 Astronomy and Astrophysics  
Aims. We studied the hypothesis that micrometeorites and Enceladus' plume activity could carry sulfur-bearing species into the upper atmosphere of Titan, in a manner similar to oxygen-bearing species. Methods. We have developed a detailed photochemical model of sulfur compounds in the atmosphere of Titan that couples hydrocarbon, nitrogen, oxygen, and sulfur chemistries. Results. Photochemical processes produce mainly CS and H 2 CS in the upper atmosphere of Titan and C 3 S, H 2 S and CH 3 SH
more » ... H 2 S and CH 3 SH in the lower atmosphere. Mole fractions of these compounds depend significantly on the source of sulfur species. Conclusions. A possible future detection of CS (or the determination of a low upper limit) could be used to distinguish the two scenarios for the origin of sulfur species, which then could help to differentiate the various scenarios for the origin of H 2 O, CO, and CO 2 in the stratosphere of Titan.
doi:10.1051/0004-6361/201424703 fatcat:oxk657afzvblbljp2fmhqifko4