planetary migration

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The movement of a planet towards or away from its parent star as a result of aerodynamic drag from gas, random gravitational interactions with planetesimals, or resonant interactions with other coorbiting bodies. Depending on the mechanism at work and the starting location of the planet, its orbit may decrease or increase in size. The large number of hot Jupiters seen around other stars is a consequence of planetary migration at work.

Subjects: Astronomy and Astrophysics.

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