Gas Flow Near a Young Gas Giant Planet

Physics

Scientific paper

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5749 Origin And Evolution

Scientific paper

The mass acquired by a gas giant planet has long been believed to result from accretion of material within the surrounding gaseous disk (nebula). Bate, D'Angelo, and I have analyzed the properties and consequences of this flow by means of three-dimensional hydrodynamical simulations. Most of the accretion occurs after the planet has partially cleared a gap in the surrounding disk. The flow through the gap leads to accretion within the planet's Hill sphere. In that region, a circumplanetary disk forms which can serve as a site for satellite formation. The flow onto this disk is fully three-dimensional and involves shock production. The nebula exerts a torque on the planet that causes it to migrate radially. We have recently examined the torques produced by the material within the gap and within the Hill sphere.

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