Planetary Atmospheres |
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Authors: | Tobias C Owen |
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Institution: | (1) University of Hawaii, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA |
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Abstract: | The predominance of nitrogen in highly volatile forms and of carbon in solids set the abundance ratios of these elements in
the inner planets, meteorites and comets. The absence of carbon compounds in an atmosphere then signals large deposits of
carbon-bearing compounds in surface and/or subsurface deposits. In contrast, the icy planetesimals that contributed heavy
elements to Jupiter must have had identical enrichments (relative to hydrogen) of both C and N, as well as other heavy elements
that have been measured, compared to solar values. Capture of N and Ar suggests that the icy planetesimals that carried these
elements must have formed at low temperatures, <40 K. New measurements of isotopes of nitrogen support this picture, but we
must have more measurements in more atmospheres to be certain of this scenario. |
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Keywords: | ??? |
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