Mathematics – Logic
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..358k&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.358
Mathematics
Logic
Scientific paper
Despite Jovian moon Ganymede and Callisto have similar size and bulk density, their interiors are geodetically estimated to be quite different. We propose a new hypothesis to create the interior dichotomy by focusing on a dehydration of primitive hydrous rock and metal mixed core. Numerical simulations for the moons' thermal history are performed with various silicate fractions which are constrained by the factor of moment of inertia and bulk density. In the intermediate silicate fraction (~50 wt %), our results show that Ganymede's interior can form the metallic core while sli-ghtly smaller Callisto would not heat up sufficiently to melt the metal. In addition, the volume expansion due to dehydration and the timing of dehydration event in our results are consistent with the amount of radial increment estimated from previous geological estimate and the cratering age of the grooved terrain.
Kimura Jun
Kuramoto Kazuyuki
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