Deserts and pile-ups in the distribution of exoplanets due to photoevaporative disc clearing
Deserts and pile-ups in the distribution of exoplanets due to photoevaporative disc clearing
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DOI：
10.1111/j.1745-3933.2012.01243.x
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发表时间：
2012-02
期刊：
影响因子：
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通讯作者：
Richard Alexander;I. Pascucci
中科院分区：
文献类型：
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作者：
Richard Alexander;I. Pascucci
我们提出了巨大的行星迁移模型在不断发展的原行星盘。我们表明，光盘清除极紫外光蒸发可以有很强的影响巨大的行星半长轴的分布。在圆盘清理期间，行星迁移在光蒸发在圆盘中打开缺口的区域减慢或加速，导致“沙漠”，在那里几乎没有发现巨行星，并且在较小和较大的半径处相应地“堆积”。然而，这些特征的精确位置和大小是行星吸积效率的强函数，因此也强烈依赖于行星质量。我们认为，光蒸发盘清理可能是负责堆积的太阳系外行星的调查中看到的在101 Au质量的行星，并表明，观测的分布的太阳系外行星的半长轴可以用来测试模型的行星迁移和光盘清除。
We present models of giant planet migration in evolving protoplanetary discs. We show that disc clearing by extreme-ultraviolet photoevaporation can have a strong effect on the distribution of giant planet semimajor axes. During disc clearing, planet migration is slowed or accelerated in the region where photoevaporation opens a gap in the disc, resulting in ‘deserts’ where few giant planets are found and corresponding ‘pile-ups’ at smaller and larger radii. However, the precise locations and sizes of these features are strong functions of the efficiency of planetary accretion, and therefore also strongly dependent on planet mass. We suggest that photoevaporative disc clearing may be responsible for the pile-up of ∼Jupiter-mass planets at ∼1 au seen in exoplanet surveys, and show that observations of the distribution of exoplanet semimajor axes can be used to test models of both planet migration and disc clearing.