Volume 536, December 2011
|Number of page(s)||4|
|Published online||02 December 2011|
Letter to the Editor
First results of Herschel-SPIRE observations of Titan⋆
LESIA–Observatoire de Paris, CNRS, Université Paris 6, Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France
2 University College London, Department of Physics and Astronomy, Gower Street, London WC1E 6BT, UK
3 University of Lethbridge, Institute for Space Imaging Science, Department of Physics and Astronomy, Lethbridge, Alberta T1K 3M4, Canada
4 Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany
Received: 20 October 2011
Accepted: 10 November 2011
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.
Key words: techniques: spectroscopic / submillimeter: planetary systems / planets and satellites: individual: Titan
© ESO, 2011
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