Oscillatory migration of accreting protoplanets driven by a 3D distortion of the gas flow
Oscillatory migration of accreting protoplanets driven by a 3D distortion of the gas flow
复制标题
由气流 3D 扭曲驱动的吸积原行星的振荡迁移
DOI：
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发表时间：
2019
影响因子：
6.5
通讯作者：
M. Lambrechts
中科院分区：
文献类型：
--
作者：
O. Chrenko;M. Lambrechts
上下文一个低质量的原行星吸积固体的动力学的影响的加热扭矩，这被发现抑制向内迁移的原行星盘与恒定的不透明度。
目标。我们调查的差异，在磁盘之间的加热扭矩恒定和温度依赖性的不透明度。
方法.利用三维辐射流体动力学模拟研究了一颗超地球大小的原行星与气盘的相互作用。
结果原行星的吸积加热在周围的气体中产生了一个热的低密度区域，导致局部密度和压力梯度的不一致。结果，3D气流受到扰动，一些流线形成了一个逆行的螺旋上升到原行星上方。在恒定不透明度的磁盘，扰动流达到稳定状态和欠密气体负责的加热扭矩仍然分布在根据以前的研究。然而，如果不透明度是不均匀的，则盘结构的差异会导致更剧烈的流线畸变，并最终导致流动不稳定性。密度不足的气体形成了一种单边的不对称性，以逆行的方式围绕原行星循环。因此，加热扭矩随时间强烈振荡，并且平均而言不会抵消向内迁移。
结论.扭矩的变化使原行星的径向漂移振荡，包括交替快速向内和向外迁移的短间隔。我们推测，积极和振荡加热扭矩之间的过渡可能发生在特定的磁盘区域容易垂直对流，导致多个行星胚胎的收敛迁移。
Context. The dynamics of a low-mass protoplanet accreting solids is influenced by the heating torque, which was found to suppress inward migration in protoplanetary disks with constant opacities.
Aims. We investigate the differences in the heating torque between disks with constant and temperature-dependent opacities.
Methods. Interactions of a super-Earth-sized protoplanet with the gas disk are explored using 3D radiation hydrodynamic simulations.
Results. Accretion heating of the protoplanet creates a hot underdense region in the surrounding gas, leading to misalignment of the local density and pressure gradients. As a result, the 3D gas flow is perturbed and some of the streamlines form a retrograde spiral rising above the protoplanet. In the constant-opacity disk, the perturbed flow reaches a steady state and the underdense gas responsible for the heating torque remains distributed in accordance with previous studies. If the opacity is non-uniform, however, the differences in the disk structure can lead to more vigorous streamline distortion and eventually to a flow instability. The underdense gas develops a one-sided asymmetry which circulates around the protoplanet in a retrograde fashion. The heating torque thus strongly oscillates in time and does not on average counteract inward migration.
Conclusions. The torque variations make the radial drift of the protoplanet oscillatory, consisting of short intervals of alternating rapid inward and outward migration. We speculate that transitions between the positive and oscillatory heating torque may occur in specific disk regions susceptible to vertical convection, resulting in the convergent migration of multiple planetary embryos.
吸积盘中的流体动力对流
影响因子：
4.8
作者：
Held L
通讯作者：
Held L
嵌入弱磁化湍流盘中的行星所经历的共转扭矩
影响因子：
6.5
作者：
Baruteau C
通讯作者：
Baruteau C