TWO-DIMENSIONAL STUDY OF THE PROPAGATION OF PLANETARY WAKE AND THE INDICATION OF GAP OPENING IN AN INVISCID PROTOPLANETARY DISK
TWO-DIMENSIONAL STUDY OF THE PROPAGATION OF PLANETARY WAKE AND THE INDICATION OF GAP OPENING IN AN INVISCID PROTOPLANETARY DISK
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DOI：
10.1088/0004-637x/724/1/448
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发表时间：
2010-09
期刊：
影响因子：
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通讯作者：
T. Muto;T. Suzuki;S. Inutsuka
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文献类型：
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作者：
T. Muto;T. Suzuki;S. Inutsuka
利用二维局部剪切片模型，分析了含嵌入原行星的无粘原行星盘中间隙形成的物理过程。行星激波发射的螺旋密度波和波携带的角动量被转移到背景流中。角动量的交换会影响行星附近的质量通量，从而在行星轨道周围形成一个密度不足的区域或间隙。我们首先进行弱非线性分析表明，由冲击耗散的密度波形成的特定的涡度可以在行星附近的质量通量的来源，差距甚至可以打开低质量的行星，除非迁移的行星是实质性的。然后，我们进行高分辨率的数值模拟，以检查分析的考虑。通过比较间隙开放时间尺度和I型迁移时间尺度，我们提出了一个与以往研究有质的不同的关于行星轨道周围欠密区形成的判据.如果我们将I型迁移时间尺度的标准值结合起来，行星形成倾角所需的最小质量是以前研究的两倍，但是如果在圆盘中有一个I型迁移停止的位置，它可以小得多。
We analyze the physical processes of gap formation in an inviscid protoplanetary disk with an embedded protoplanet using a two-dimensional local shearing-sheet model. The spiral density wave launched by the planet shocks and the angular momentum carried by the wave is transferred to the background flow. The exchange of the angular momentum can affect the mass flux in the vicinity of the planet to form an underdense region, or gap, around the planetary orbit. We first perform weakly nonlinear analyses to show that the specific vorticity formed by shock dissipation of the density wave can be a source of mass flux in the vicinity of the planet and that the gap can be opened even for low-mass planets unless the migration of the planet is substantial. We then perform high-resolution numerical simulations to check analytic consideration. By comparing the gap-opening timescale and type I migration timescale, we propose a criterion for the formation of underdense region around the planetary orbit that is qualitatively different from previous studies. The minimum mass required for the planet to form a dip is twice as small as previous studies if we incorporate the standard values of type I migration timescale, but it can be much smaller if there is a location in the disk where type I migration is halted.