Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979icar...39....1c&link_type=abstract
Icarus, vol. 39, July 1979, p. 1-27.
Astronomy and Astrophysics
Astronomy
16
Abundance, Atmospheric Composition, Jupiter Atmosphere, Ammonia, Astronomical Models, Carbon Isotopes, Cosmology, Gas Giant Planets, Hydrogen Isotopes, Nitrogen
Scientific paper
A method for determining elemental and isotopic abundance ratios in the outer planets from visual and near-infrared spectroscopic data is proposed and applied to the determination of the C-12/C-13, C/H, D/H and C/N ratios of Jupiter. An ideal case described by conditions implying identical scattering processes in the formation of spectral lines or bands from different species is defined, for which abundance ratios can be measured directly from absorption coefficient ratios. For Jupiter, the C-12/C-13 and C/H ratios, for which all conditions are fulfilled, are determined to be 89 + 12 or - 10 and 6.2 + or - 2.1 x 10 to the -4th, respectively; the D/H and C/N ratios are calculated to be 1.3 + or -1.0 x 10 to -5th and 19 + 13 or - 7, respectively. It is concluded that there is no evidence of an enrichment of C or D in the Jovian atmosphere with respect to the expected composition of the primordial nebula.
Combes Michel
Encrenaz Th.
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