Dynamical Shake-up of Planetary Systems. I. Embryo Trapping and Induced Collisions by the Sweeping Secular Resonance and Embryo-Disk Tidal Interaction

摘要: We analyze the orbital evolution of terrestrial planetary embryos after oligarchic growth, including effect sweeping Jupiter secular resonance combined with tidal drag during depletion protoplanetary gas disk. Previous studies show that orbits isolated become unstable through long-term gravitational interaction. However, systems formed as a result giant impacts are generally very eccentric, unlike our solar system. Although mechanisms damp eccentricity have been proposed, such not only strongly but also prevent their crossing and growth. This dilemma can be solved if collisions occur in an environment where damping is still working. consider stage formation Jupiter-like planet The changes potential causes resonance. find passes region from outside to inside, excites eccentricities embryos, it leads orbit crossing. Because remnant disk present this stage, due interaction effective. effectively damps fully grown embryos. process allows system form circular analogous induces decay semimajor axes As balance between excitation eccentricity, migrate along "secular trapping" lead rapid mergers among they outer inner region, concurrent depletion. Since induced migration strongest near Jovian orbit, final planets tend concentrated relatively small (<2 AU). suggest mechanism may origin severe present-day mass asteroid belt.