Planetesimal Accretion in Tight Binary Systems

CORREA-OTTO, J. ; BEAUGE, C.; BENITEZ LLAMBAY, P.; LEIVA, A.

Paraty

Congreso; 44th Annual Meeting of the American Astronomical Society, Div. on Dynamical Astronomy; 2013

American Astronomical Society

 We present a study on the accretion process of planetesimals in tight binary systems. We develop an analytical model that considers the effects of both the gas disk and the stellar companion on the planetesimals motion. The model was then applied to the γ-Cephei binary system, with minimal relative separation between the stars of 12 AU and a planet around the main star at sim 2 AU. Our study allowed us to determine the dynamics of planetesimals in a low eccentricity non-precessing gas disk. The evolution of a large number of particles of different sizes was considered. Then, we calculated the relative encounters velocities between pairs of planetesimals, in order to determine whether their magnitudes remained below the disruption limit. We have found that all planetesimals, independently on their sizes, were able to accrete in the distances 2-3 AU from the primary star.