Formation of Earth-like Planets During and After Giant Planet Migration

摘要: Close-in giant planets are thought to have formed in the cold outer regions of planetary systems and migrated inward, passing through orbital parameter space occupied by terrestrial our own solar system. We present dynamical simulations effects a migrating planet on disk protoplanetary material subsequent evolution numerically investigate dynamics postmigration over 200 million years using models with single planet, one nonmigrating excluding gas disk. Material that is shepherded front moving mean motion resonances accretes into hot Earths, but survival these bodies strongly dependent damping. Furthermore, significant amount scattered outward survives highly excited orbits; orbits then damped drag friction remaining accretion time. In all Earth-mass accrete approximately 100 Myr timescales, often habitable zone. These range mass water content, both quantities increasing presence decreasing an planet. use scaling arguments previous results derive simple recipe constrains which able form harbor Earth-like zone, demonstrating roughly one-third known potentially habitable.