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Enhancement of deuterated ethane on Jupiter

Lee, Anthony Y. T. and Yung, Yuk L. and Cheng, Bing-Ming and Bahou, Mohammed and Chung, Chao-Yu and Lee, Yuan-Pern (2001) Enhancement of deuterated ethane on Jupiter. Astrophysical Journal Letters, 551 (1). L93-L96. ISSN 2041-8205. doi:10.1086/319827.

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We report laboratory measurements of cross sections of CH_3D and C_2H_5D in the extreme ultraviolet. The results are incorporated in a photochemical model for the deuterated hydrocarbons up to C_2 in the upper atmosphere of Jupiter, taking into account the fast reactions for exchanging H and D atoms between H_2 and CH_4, H + HD ↔ D + H_2, CH_3 + D ↔ CH_2D + H. Since there is no reliable kinetics measurement for the reaction, CH_2D + H → CH_3 + D, we use Yung et al.'s estimate for its rate constant. The strong temperature dependence for this reaction leads to large isotopic fractionation for CH_3D and C_2H_5D in the upper atmosphere of Jupiter, where their production rates depend on the abundance of deuterated methyl radical. The model predicts that the D/H ratio in deuterated ethane is about 15 times that of the bulk atmosphere. A confirmation of this result would provide a sensitive test of the photochemistry of hydrocarbons in the atmosphere of Jupiter.

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Yung, Yuk L.0000-0002-4263-2562
Additional Information:© 2001 American Astronomical Society. Received 2000 October 3; accepted 2001 January 26; published 2001 April 3. We thank M. Allen, M. F. Gerstell, and C. Parkinson for helpful comments. This work was supported by NASA grant NAG5-6263 and the Cassini UVSI project.
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Subject Keywords:planets and satellites: individual (Jupiter)
Issue or Number:1
Record Number:CaltechAUTHORS:20140820-133651921
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Official Citation:Enhancement of Deuterated Ethane on Jupiter Anthony Y. T. Lee et al. 2001 ApJ 551 L93
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48738
Deposited By: Jason Perez
Deposited On:20 Aug 2014 21:29
Last Modified:10 Nov 2021 18:35

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