Upper limits for undetected trace species in the stratosphere of Titan

Details Upper limits for undetected trace species in the stratosphere of Titan Upper limits for undetected trace species in the stratosphere of Titan

2011-03-01

arxiv.org/abs/1103.0297v1

Faraday Discuss., 2010, Vol. 147, pp. 65-81

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

11 pages plus 6 figure files

Scientific paper

10.1039/c003771k

In this paper we describe a first quantitative search for several molecules in Titan's stratosphere in Cassini CIRS infrared spectra. These are: ammonia (NH3), methanol (CH3OH), formaldehyde (H2CO), and acetonitrile (CH3CN), all of which are predicted by photochemical models but only the last of which observed, and not in the infrared. We find non-detections in all cases, but derive upper limits on the abundances from low-noise observations at 25{\deg}S and 75{\deg}N. Comparing these constraints to model predictions, we conclude that CIRS is highly unlikely to see NH3 or CH3OH emissions. However, CH3CN and H2CO are closer to CIRS detectability, and we suggest ways in which the sensitivity threshold may be lowered towards this goal.

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