Abstract
Current knowledge of element abundances and isotope ratios in the atmospheres of the major planets is reviewed. The observed enhancement of C/H compared with the solar value favours models for the origin of these bodies that invoke the accretion and degassing of an ice-rock core followed by the accumulation of a solar composition envelope. Titan may represent an example of a core-forming planetesimal. Observations of D/H and other isotope ratios must be accommodated by these models in ways that are not yet completely clear. Some additional tests are suggested.
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Gautier, D., Owen, T. Cosmogonical implications of elemental and isotopic abundances in atmospheres of the giant planets. Nature 304, 691–694 (1983). https://doi.org/10.1038/304691a0
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DOI: https://doi.org/10.1038/304691a0
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