巨行星形成的磁致终止
Magnetically induced termination of giant planet formation
摘要：
这里概述了一个终止巨行星形成的物理模型，并与其他晚期巨行星形成的方法进行了比较。正如前面已经指出的，气体吸积到一个间隙和行星上将遇到行星发电机产生的磁场。行星磁场产生一个有效的截面，通过它气体被吸积。在这个横截面之外的气体被回收到原行星盘中，因此只有一小部分质量被吸积到间隙中，仍然与行星结合在一起。这个截面与行星质量成反比，这自然会导致行星在形成过程的后期停止生长。我们表明，这种方法自然会导致恒星质量的行星，并没有调用任何人为截断的气体吸积，已经做了一些以前的人口合成模型。质量吸积率取决于间隙打开后生长行星的半径，我们表明所谓的热启动行星往往比冷启动行星更大。当这一结果与人口合成模型相结合时，它可能会显示出系外行星人口中冷启动与热启动行星的可观察特征。
英文摘要：
Here a physical model for terminating giant planet formation is outlined and compared to other methods of late-stage giant planet formation. As has been pointed out before, gas accreting into a gap and onto the planet will encounter the planetary dynamo-generated magnetic field. The planetary magnetic field produces an effective cross section through which gas is accreted. Gas outside this cross section is recycled into the protoplanetary disk, hence only a fraction of mass that is accreted into the gap remains bound to the planet. This cross section inversely scales with the planetary mass, which naturally leads to stalled planetary growth late in the formation process. We show that this method naturally leads to Jupiter-mass planets and does not invoke any artificial truncation of gas accretion, as has been done in some previous population synthesis models. The mass accretion rate depends on the radius of the growing planet after the gap has opened, and we show that so-called hot-start planets tend to become more massive than cold-start planets. When this result is combined with population synthesis models, it might show observable signatures of cold-start versus hot-start planets in the exoplanet population.
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