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Published November 1, 2003 | Published + Submitted
Journal Article Open

Propane on Titan

Abstract

We present the first observations of propane (C_3H_8) on Titan that unambiguously resolve propane features from other numerous stratospheric emissions. This is accomplished using a R = λ/δλ ≈ 10^5 spectrometer (the Texas Echelon Cross Echelle Spectrograph) to observe propane's ν_(26) rotation-vibration band near 748 cm^(-1). We find a best-fit fractional abundance of propane in Titan's stratosphere of (6.2 ± 1.2) × 10^(-7) in the altitude range to which we are sensitive (90-250 km or 13-0.24 mbar).

Additional Information

© 2003. The American Astronomical Society. Received 2003 August 27; accepted 2003 September 18; published 2003 October 9. We thank several people who shared their time and advice, including especially L. Lara, B. Blass, G. Bjoraker, R. Gamache, V. Typke, and the referee. Observations with TEXES are supported by NSF grant AST 02-05518. T. K. G. and M. J. R. were supported by the SOFIA project through USRA grant 8500-98-005.

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August 22, 2023
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