کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1773850 | 1021148 | 2011 | 4 صفحه PDF | دانلود رایگان |

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.
Journal: Icarus - Volume 215, Issue 2, October 2011, Pages 599–602