Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.6313h&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #63.13; Bulletin of the American Astronomical Society, Vol. 34, p.560
Astronomy and Astrophysics
Astronomy
Scientific paper
It has been shown that a giant planet in a disk of planetesimals can undergo radial migration because of dynamical friction (Haghighipour 1999, Del Popolo et al. 2001). Such a migration has been considered as a possible mechanism through which some of the recently discovered extrasolar planets can exist at small distances (<1AU) from their central stars. In this paper, I present a comprehensive numerical study of the dynamics of a planet subject to dynamical friction. A planar and circular three-body system consisting of a star and two giant planets, in a disk of planetesimals, is considered and the equation of motion of its outer planet is numerically integrated. It is shown that the planet will undergo inward or outward migrations which in some cases are followed by temporary or permanent captures in mean-motion resonances. It is also shown how the direction of the migration and also the numerical values of the resonances depend on the density of the disk and also the masses of the star and the planets. Haghighipour N., 1999, MNRAS, 304, 185. Del Popolo A., Gambera M., Ercan N., 2001, MNRAS, 325, 1402.
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