Abstract
In terms of evolution of planet, differentiation is one of the most important events. Particularly, mantle-core differentiation should affect not only the internal structure of the planet but also the following evolution of the planet, by heating the interior of the planet by released gravitational energy and/or by changing the efficiency of impact heating. In this study, we develop a new numerical model to simulate early evolution of planetesimal taking into account the internal heating by decay of short-lived radioisotopes and core formation due to permeable flow of molten metal. Diminution of porosity due to sintering of silicate grains is also considered. In the presentation, we will discuss the condition of core formation within planetesimals, in terms of the effect of initial size and composition of the planetesimal and the starting time of thermal evolution which decides the rest of radioisotopes within the planetesimal.
