What can Triton's retrograde orbit tell us about how the Giant Planet interiors were constructed and acquired their gas/ice envelopes?

Details What can Triton's retrograde orbit tell us about how the Giant Planet interiors were constructed and acquired their gas/ice envelopes? What can Triton's retrograde orbit tell us about how the Giant Planet interiors were constructed and acquired their gas/ice envelopes?

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..953o&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.953

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Scientific paper

In the absence of their massive gas and ice envelopes, the GP silicate 'cores' could well have have been interstitially molten, due to accretion and other heating, so would likely have had the required viscosity and tidal propensity. But the imposition of the envelopes has made them liquid and lose it, the moment of so doing being documented by the interruption of Triton's spiral motion. So the picture which emerges is that these envelopes were late-stage gravitational acquisitions during the final nebular clear-out from the inner part of the system. Proto- Jupiter, the innermost of the four, by attracting the most, also had its rotation spun up the most. The water and hydrocarbon contents of these envelopes are unlikely be of nebular origin but are suggested as being the chemical products of iron core formation (Ringwood model) in the terrestrial planets [3], picked up during this clear-out. Here I will develop this picture briefly in the frame of a two-stage scenario for planetary system formation [4,5].

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