Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dda....38.1501c&link_type=abstract
American Astronomical Society, DDA meeting #38, #15.01
Astronomy and Astrophysics
Astronomy
Scientific paper
Observations in the past decade have revealed extrasolar planets with a wide range of semi-major axes and eccentricities. Based on the present understanding of planet formation via core accretion and oligarchic growth, giant planets can often form in a closely packed configuration. Once the disk is sufficiently depleted, the eccentricities can grow rapidly leading to close-encounters. This chaotic phase of evolution can structure the orbital properties of the planets in GYr timescales, starting from disk dissipation to when we observe them. We explore strong gravitational scattering in a gas-free multi-planet system as a mechanism to explain the orbital properties of the observed exoplanet population. We numerically investigate long term stability of representative multi-planet systems with 3 giant planets around a central star. We assign realistic planet masses following the core accretion scenario. We discuss strong gravitational scattering as a mechanism to create highly eccentric orbits and close-in giant planets. Our results also make testable predictions for the inclinations of the close-in giant planets formed via planet scattering followed by tidal circularization.
Chatterjee Sourav
Ford Eric B.
Rasio Frederic A.
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