The most catastrophic scenario for
such planet migration, dubbed the Nice model (after the French city), has been gaining ground of late.
The
giant planet migration shook up the asteroid belt, removing many bodies, possibly including the parent of this family.»
After
planet migration stops, it gradually carves open a gap in the disk, and lowers its gas accretion rate to prevent runaway accretion.
Cartoon showing how
efficient planet migration around red dwarfs lead to the more observed planets than around sunlike stars, even though the disk is lower in mass and forms fewer planets in total.
The theory of their formation requires answers to two main questions: 1) how to stop
fast planet migration, and 2) how to prevent runaway accretion.
This work sheds light on the complex youth of our solar system, when the building blocks that formed the core of giant planets and their satellites were tossed around or captured during the
giant planet migrations.