On the evolution of the resonant planetary system HD128311

Abstract

A significant number of the known multiple exoplanetary systems are containing a pair of giant planets engaged in a low order mean motion resonance. Such a resonant condition protects the dynamics of these planets resulting in very stable orbits. According to recent studies the capture into a resonance is the result of a planetary migration process induced by the interaction of the planets with a protoplanetary disk. If the migration is slow enough (adiabatic) next to a mean motion resonance, the two planets will also be in apsidal corotation. The recently refined orbital parameters of the system HD 128311 suggest that the two giant planets are in a 2:1 mean motion resonance, however without exhibiting apsidal corotation. Thus the evolution of this system can not be described by an adiabatic migration process alone. We present possible evolution scenarios of this system combining migration processes and sudden perturbations. We model migration scenarios through numerical integration of the gravitational N-body problem with additional non-conservative forces. Planet-planet scattering has been investigated by N-body simulations. We show that the present dynamical state of the system HD128311 may be explained by such evolutionary processes.

4 Pages, 7 Figures, accepted for AA Letters

References in corpus (9)

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• On the evolution of the resonant planetary system HD128311

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• On the evolution of the resonant planetary system HD128311
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• What is a planet?
• The Asteroid Belt as a Relic From a Chaotic Early Solar System
• The quest for companions to post-common envelope binaries IV: The 2:1 mean-motion resonance of the planets orbiting NN Serpentis
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• A Hybrid Mechanism Forming a 2:1 Librating-Circulating Resonant Configuration in the Planetary System
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