Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.4203t&link_type=abstract
American Astronomical Society, DPS meeting #39, #42.03; Bulletin of the American Astronomical Society, Vol. 39, p.496
Astronomy and Astrophysics
Astronomy
Scientific paper
Planetary formation in binary systems has been investigated in several recent numerical studies (e.g. thebault et al.2004,2006, Ciecielag et al.2007, Tsukamoto&Makino, 2007, etc.) which have shown that gaseous friction could play a crucial role in the early stages of mutual planetesimal accretion. We present here the first numerical study of planetesimal dynamics in a circumprimary disc taking into account the perturbing influence of the companion star on both the planetesimal population and the gas disc in which it is embedded (instead of assuming a static axisymmetric gas disc as in most previous studies), using the RODEO method for solving the hydrodynamic equations (Paardekooper & Mellema 2006).As in Thebault et al.(2006), we follow the evolution of one crucial parameter: the distribution of encounter velocities within the planetesimal population. Preliminary results show that the onset of spiral density waves in the gas disc does not, on average, drastically alter the impact velocity distribution. However, the global eccentricity of the gas disc could, depending on the inner boundary of this disc, reach values high enough to significantly affect planetesimal dynamics with respect to the axisymmetric case.
Mellema Garrelt
Paardekooper S.
Thébault Philippe
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