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A REDUCED EFFICIENCY OF TERRESTRIAL PLANET FORMATION FOLLOWING GIANT PLANET MIGRATION

机译:巨型行星迁移后陆地行星形成的效率降低

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摘要

Substantial orbital migration of massive planets may occur in most extrasolar planetary systems. Since migration is likely to occur after a significant fraction of the dust has been locked up into planetesimals, ubiquitous migration could reduce the probability of forming terrestrial planets at radii of the order of 1 AU. Using a simple time dependent model for the evolution of gas and solids in the disk, I show that replenishment of solid material in the inner disk, following the inward passage of a giant planet, is generally inefficient. Unless the timescale for diffusion of dust is much shorter than the viscous timescale, or planetesimal formation is surprisingly slow, the surface density of planetesimals at 1 AU will typically be depleted by 1-2 orders of magnitude following giant planet migration. Conceivably, terrestrial planets may exist only in a modest fraction of systems where a single generation of massive planets formed and did not migrate significantly.
机译:在大多数太阳系外行星系统中,可能发生大规模行星的轨道迁移。由于在相当一部分尘埃被锁定在小行星之后可能发生迁移,因此普遍存在的迁移可能会降低形成半径为1 AU的地球行星的可能性。我使用一个简单的时间相关模型来计算盘中气体和固体的逸出,我发现随着巨大行星的向内通过,内盘中固体物质的补充通常效率低下。除非粉尘扩散的时间尺度比粘性时间尺度短得多,否则除非小行星的形成异常缓慢,否则在1 AU时小行星的表面密度通常会在巨大的行星迁移后消耗1-2个数量级。可以想象,地球行星可能只存在于系统的一部分中,在该系统中,只有一代世代大型行星形成并且没有显着迁移。

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