The first detection of propane on Saturn

被引：28

作者：

Greathouse, TK

Lacy, JH

Bézard, B

Moses, JI

Richter, MJ

Knez, C

机构：

[1] Lunar & Planetary Inst, Houston, TX 77058 USA

[2] Univ Texas, Dept Astron, Austin, TX 78712 USA

[3] Observ Paris, Sect Meudon, F-92195 Meudon, France

[4] Univ Calif Davis, Davis, CA 95616 USA

来源：

ICARUS | 2006年 / 181卷 / 01期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

abundances; atmospheres; infrared observations; Saturn;

D O I：

10.1016/j.icarus.2005.09.016

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the first detection of propane, C3H8, in Saturn's stratosphere. Observations taken on September 8, 2002 UT at NASA's IRTF using TEXES, show multiple emission lines due to the 748 cm(-1) nu (21) band of C3H8. Using a line-by-line radiative transfer code, we are able to fit the data by scaling the propane vertical mixing ratio profile from the photochemical model of Moses et al. [2000. Icarus 143, 244-298]. Multiplicative factors of 0.7 and 0.65 are required to fit the -20 degrees and -80 degrees planetocentric latitude spectra. The resultant profiles are characterized by a 5 mbar mixing ratio of 2.7 +/- 0.8 x 10(-8) at -20 degrees and 2.5(-0.8)(+1.7) x 10(-8) at -80 degrees latitude. These results suggest that the time scale for meridional circulation lies between the net photochemical lifetimes of C2H2 and C3H8, approximate to 30-600 years. (c) 2005 Elsevier Inc. All rights reserved.

引用

页码：266 / 271

页数：6

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