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1 results

  • 7 - Early Evolution of Planetary Systems

  • Philip J. Armitage, Stony Brook University, State University of New York
  • Book:
    Astrophysics of Planet Formation
    Published online:
    27 January 2020
    Print publication:
    30 January 2020, pp 247-300

  • Summary

    Chapter 7 covers processes that lead to the evolution of planetary systems. Planetary migration in gaseous disks is described, starting with an elementary derivation of the torque in the impulse approximation and continuing with a discussion of the physics of Lindblad and co-rotation torques. Type I and Type 2 planetary migration, gap opening, and eccentricity evolution are described. The regimes of secular and resonant dynamics are defined, together with an intuitive physical description of mean-motion resonance. Resonant capture, Kozai-Lidov dynamics, and planetesimal disk migration are discussed. The concept of Hill stability is introduced and derived, and the outcome of planetary system instability leading to planet-planet scattering is reviewed. The Nice model and the Grand Tack model for the early evolution of the Solar System are discussed. The size distribution resulting from a steady-state collisional cascade is derived, and stellar and white dwarf debris disk evolution described.