How does Type II migration conceptually differ from Type I migration for a massive, growing planet?

Answer

The growing planet opens a significant gap in the disk, coupling its migration to the disk's viscous evolution.

As a planet nears Jupiter's mass, it can clear a gap in the disk; Type II migration occurs when the planet is coupled to the evolution of the disk structure outside this cleared region.

How does Type II migration conceptually differ from Type I migration for a massive, growing planet?

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