13C-Ethane in the Atmospheres of Jupiter and Saturn

Pedro V. Sada, George H. McCabe, Gordon L. Bjoraker, Donald E. Jennings, Dennis C. Reuter

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Abstract

High-resolution 12C- and 13C-ethane spectra of Jupiter and Saturn were acquired with the McMathPierce 60 inch (1.5 m) Telescope and Celeste, Goddard Space Flight Center's cryogenic grating spectrometer, in 1995 November and December. A relative abundance ratio 12C/13C of 91+26-13 for Jupiter and 99+43-23 for Saturn was derived from the measurements. These nearly terrestrial values suggest little or no fractionation of carbon isotopes in the atmospheres of Jupiter and Saturn. A weighted average of the available 12C/13 ratios for the outer planets yields 88±7, thus presenting no evidence for change in the carbon isotopic ratio between the presolar nebula and the present atmospheres of the outer planets.
Original languageEnglish
Pages (from-to)903
JournalAstrophysical Journal v.472
Volume472
DOIs
Publication statusPublished - 1 Dec 1996

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Sada, P. V., McCabe, G. H., Bjoraker, G. L., Jennings, D. E., & Reuter, D. C. (1996). 13C-Ethane in the Atmospheres of Jupiter and Saturn. Astrophysical Journal v.472, 472, 903. https://doi.org/10.1086/178120