The nitrogen isotopic ratio in Jupiter's atmosphere from observations by the Composite Infrared Spectrometer on the Cassini spacecraft

被引:34
作者
Abbas, MM [1 ]
LeClair, A
Owen, T
Conrath, BJ
Flasar, FM
Kunde, VG
Nixon, CA
Achterberg, RK
Bjoraker, G
Jennings, DJ
Orton, G
Romani, PN
机构
[1] NASA, George C Marshall Space Flight Ctr, Huntsville, AL 35812 USA
[2] Univ Alabama, Huntsville, AL 35899 USA
[3] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
[4] Cornell Univ, Dept Astron, Ithaca, NY 14853 USA
[5] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[6] Univ Maryland, College Pk, MD 20742 USA
[7] Sci Syst & Applicat Inc, Lanham, MD 20706 USA
[8] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
关键词
ISM : abundances; ISM : evolution; planets and satellites : individual (Jupiter); solar system : formation;
D O I
10.1086/381084
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The Composite Infrared Spectrometer (CIRS) on the Cassini spacecraft made infrared observations of Jupiter's atmosphere during the flyby of 2000 December to 2001 January. The unique database in the 600-1400 cm(-1) region with 0.53 and 2.8 cm(-1) spectral resolutions obtained from the observations permits retrieval of global maps of the thermal structure and composition of Jupiter's atmosphere, including the distributions of (NH3)-N-14 and (NH3)-N-15. Analysis of Jupiter's ammonia distributions from three isolated (NH3)-N-15 spectral lines in eight latitudes is presented for evaluation of the nitrogen isotopic ratio. The nitrogen isotopic ratio N-14/N-15 (or N-15/N-14) in Jupiter's atmosphere in this analysis is calculated to be 448 +/- 62 [or (2.23 +/- 0.31) x 10(-3)]. This value of the ratio determined from CIRS data is found to be in very close agreement with the value previously obtained from the measurements by the Galileo Probe Mass Spectrometer. Some possible mechanisms to account for the variation of Jupiter's observed isotopic ratio relative to those of various astrophysical environments are discussed.
引用
收藏
页码:1063 / 1074
页数:12
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