Formation of Terrestrial Planets from Protoplanets: Effect of Imperfect Accretion

Abstract

The final stage of terrestrial planet formation is known as the giant impact stage where protoplanets collide one another to form planets. We statistically investigate this stage by using N-body simulations. So far we adopted perfect accretion in which all collisions lead to accretion. In the present paper, we adopt imperfect accretion, in other words, accretion condition of protoplanets. We show the dependences of the mass and dynamical properties of assembled planets on the accretion models. Especially we focus on the spin velocity of planets, which is decreased by the imperfect accretion.