Enceladus's and Dione's floating ice shells supported by minimum stress isostasy

Enceladus's gravity and shape have been explained in terms of a thick isostatic ice shell floating on a global ocean, in contradiction of the thin shell implied by librations. Here we propose a new isostatic model minimizing crustal deviatoric stress and demonstrate that gravity and shape data predict a 38 4km thick ocean beneath a 23 4kmthick shell agreeing withbut independent oflibration data. Isostatic and tidal stresses are comparable in magnitude. South polar crust is only 7 4km thick, facilitating the opening of water conduits and enhancing tidal dissipation through stress concentration. Enceladus's resonant companion, Dione, is in a similar state of minimum stress isostasy. Its gravity and shape can be explained in terms of a 99 23km thick isostatic shell overlying a 65 +/- 30km thick global ocean, thus providing the first clear evidence for a present-day ocean within Dione.