First results of Herschel-SPIRE observations of Titan

Details First results of Herschel-SPIRE observations of Titan First results of Herschel-SPIRE observations of Titan

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...536l...2c&link_type=abstract

Astronomy & Astrophysics, Volume 536, id.L2

Astronomy and Astrophysics

Astrophysics

Techniques: Spectroscopic, Submillimeter: Planetary Systems, Planets And Satellites: Individual: Titan

Scientific paper

We investigate the composition of Titan's stratosphere from high-resolution submillimetric observations performed with the SPIRE instrument on the Herschel satellite. From the flux density spectrum measured in the 20 - 52 cm-1 interval at an apodized resolution of 0.08 cm-1, we determine the stratospheric abundances of CH4, CO, HCN, as well as the isotopic ratios 12C/13C = 87 ± 6 in CO and 96 ± 13 in HCN, 14N/15N = 76 ± 6, and 16O/18O = 380 ± 60. The last of these results is the first documented measurement of Titan's 16O/18O ratio in CO, with a value 24% lower than the terrestrial ratio.
Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.

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