Free Access

Fig. 8

image

Models for the temperature evolution of an asteroid with 150 km radius at different depth below the surface (from bottom to top: 5, 10, 15 km, and at centre) using different assumptions with respect to the heat conductivity. Left panel: homogeneous body. Solid line: constant heat conductivity K = 4.9 W m−1 K−1 and constantheat capacity cp = 865 J g−1. Dashed line: variation of heat conductivity with temperature T as W m−1 K−1 as typical for rock material (Xu et al. 2004), and variation of heat capacity as cp = 800 + 0.25 × T − 1.5 107T2 typical for H-chondrite material (Yomogida & Matsui 1984). Right panel: heterogeneous structure with compact core and a 2 km thick insulating mantle. Solid line: constant heat conductivity K = 4.9 W m−1 K−1 and constantheat capacity cp = 865 J g−1. Mantle with K reduced by a factor of 5, Dashed line: heat conductivity for H-chondrite material according to theheat conductivity model of this work and variation of heat capacity with T as for H-chondrite material. The time axis corresponds to age after formation. The body ist assumed to be formed at 2.2 Ma after CAI formation. The composition corresponds to that of H chondrites.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.