Resonant inclination excitation of migrating giant planets

Details Resonant inclination excitation of migrating giant planets Resonant inclination excitation of migrating giant planets

2003-08-07

arxiv.org/abs/astro-ph/0308112v1

Astrophys.J.597:566-580,2003

Astronomy and Astrophysics

Astrophysics

to appear in ApJ 597, November 1, 2003

Scientific paper

10.1086/378317

The observed orbits of extrasolar planets suggest that many giant planets migrate a considerable distance towards their parent star as a result of interactions with the protoplanetary disk, and that some of these planets become trapped in eccentricity-exciting mean motion resonances with one another during this migration. Using three-dimensional numerical simulations, we find that as long as the timescale for damping of the planets' eccentricities by the disk is close to or longer than the disk-induced migration timescale, and the outer planet is more than half the mass of the inner, resonant inclination excitation will also occur. Neither the addition of a (simple, fixed) disk potential, nor the introduction of a massive inner planetary system, inhibit entry into the inclination resonance. Therefore, such a mechanism may not be uncommon in the early evolution of a planetary system, and a significant fraction of exoplanetary systems may turn out to be non-coplanar.

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