| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1773850 | Icarus | 2011 | 4 Pages |
This study explores the geophysical implications of two compositional models recently proposed for Ceres, which assume that the dwarf planet is a homogeneous mixture of chondritic material devoid with free water. In order to reproduce Ceres’ density, the rock density has to be offset by the presence of porosity and/or an abundance of hydrated salts resulting from the extensive hydration and oxidation of the chondritic material. Thermal modeling shows that a mixture of hydrated minerals is bound to compact and partly dehydrate as a consequence of long-lived radioisotope decay heat. The resulting interior structure is differentiated in a silicate-rich core and water-rich shell, with little porosity. Hence, this study confirms previous suggestion that Ceres contains a large fraction of free water.
► Models of Ceres devoid with free ice is not supported by geophysical modeling. ► A CI-chondrite composition is not consistent with Ceres’ density. ► Ceres’ density is best explained by the existence of a water-rich outer shell.
