On oligarchic growth of planets in protoplanetary disks

ADRIÁN BRUNINI, OMAR G. BENVENUTO

ICARUS

ACADEMIC PRESS INC ELSEVIER SCIENCE

Lugar: New York; Año: 2008 vol. 194 p. 800 - 810

0019-1035

In this paper we present a new semianalytical model of oligarchic growth of planets considering a distribution of planetesimal sizes, fragmentationof planetesimals in mutual collisions, sublimation of ices through the snow line, random velocities out of equilibrium and merging ofplanetary embryos. We show that the presence of several planetary embryos growing simultaneously at different locations in the protoplanetarydisk affects the whole accretion history, specially for the innermost planets. The results presented here clearly indicate the relevance of consideringa distribution of planetesimal sizes. Fragmentation occurring during planetesimal?planetesimal collisions represent only a marginal effect inshaping the surface density of solid material in the protoplanetary disc.