Upper limits for PH3 and H2S in Titan's Atmosphere from Cassini CIRS
Conor A. Nixon, Nicolas A. Teanby, Patrick G.J. Irwin, Sarah M. Horst
TL;DR
This study uses Cassini CIRS infrared spectra to set upper limits on phosphine and hydrogen sulfide in Titan's atmosphere, providing new constraints on their possible abundances.
Contribution
It is the first to establish upper limits for PH3 and H2S in Titan's stratosphere using Cassini data.
Findings
PH3 upper limit: 1 ppb
H2S upper limit: 330 ppb
Constraints improve understanding of Titan's atmospheric composition
Abstract
We have searched for the presence of simple P and S-bearing molecules in Titan's atmosphere, by looking for the characteristic signatures of phosphine and hydrogen sulfide in infrared spectra obtained by Cassini CIRS. As a result we have placed the first upper limits on the stratospheric abundances, which are 1 ppb (PH3) and 330 ppb (H2S), at the 2-sigma significance level.
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