Element Abundances and Isotope Ratios in the Giant Planets and Titan |
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Authors: | Owen T Encrenaz T |
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Institution: | (1) Institute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822, USA;(2) LESIA, Observatoire de Paris, 92195 Meudon, France |
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Abstract: | This paper reviews our present knowledge about elemental and isotopic ratios in the Giant Planets and Titan. These parameters
can provide key information about the formation and evolution of these objects. Element abundances, especially after the results
of the Galileo Probe Mass Spectrometer in Jupiter, strongly support the formation model invoking an initial core formation
(Mizuno, 1980; Pollack et al., 1996). They also suggest that solar composition icy planetesimals (SCIPs) brought the heavy elements to Jupiter. The Jupiter
value of D/H appears to be representative of the protosolar value, while the D/H enrichment observed on Uranus and Neptune
is consistent with the formation scenario of these planets. The 15N/14N measurement in Jupiter seems to be representative of its protosolar value. Future measurements are expected to come from
the Cassini and Herschel space mission, as well as the ALMA submillimeter observatory.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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