DISK-FED GIANT PLANET FORMATION

DISK-FED GIANT PLANET FORMATION
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盘式巨行星的形成

DOI:
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发表时间:
2016
期刊:
影响因子:
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通讯作者:
K. Menou
K. Menou
中科院分区:
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文献类型:
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作者:
J. Owen;K. Menou

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大质量的巨行星,比如那些通过直接成像调查发现的行星,可能会通过环行星盘经历大部分的生长。我们认为,吸积物质的熵是由边界层过程,不像“冷”或“热启动”的假设通常调用的核心吸积和直接崩溃的情况。一个简单的行星演化模型说明了大范围的半径和光度轨迹是如何成为可能的,这取决于吸积过程的细节。具体来说,如果边界层的高度是0.24,这个值并不比环行行星盘的高度大多少,那么原行星会朝着“热启动”轨道演化。因此,要了解年轻巨行星的光度和半径,就需要有详细的环行星吸积模型。
Massive giant planets, such as the ones being discovered by direct imaging surveys, likely experience the majority of their growth through a circumplanetary disk. We argue that the entropy of accreted material is determined by boundary layer processes, unlike the “cold-” or “hot-start” hypotheses usually invoked in the core-accretion and direct-collapse scenarios. A simple planetary evolution model illustrates how a wide range of radius and luminosity tracks become possible, depending on details of the accretion process. Specifically, the protoplanet evolves toward “hot-start” tracks if the scale height of the boundary layer is ≳0.24, a value not much larger than the scale height of the circumplanetary disk. Understanding the luminosity and radii of young giant planets will thus require detailed models of circumplanetary accretion.