Vortex cycles at the inner edges of dead zones in protoplanetary disks
Vortex cycles at the inner edges of dead zones in protoplanetary disks
复制标题
原行星盘死区内边缘的涡旋循环
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
H. Meheut
中科院分区：
文献类型：
--
作者：
J. Faure;S. Fromang;H. Latter;H. Meheut
在原行星盘中，湍流区域和层流区域之间的内部边界是行星形成的有希望的地点，因为固体可能被困在界面本身或罗斯贝波不稳定性产生的涡旋中。由于湍流耗散对热电离的重要性，以及相反，热电离对湍流的重要性，圆盘热力学和该位置的湍流动力学相互交织。然而，大多数先前的工作都忽略了这种动态耦合，因此错过了该区域物理学的关键要素。在本文中，我们的目的是确定电离和湍流之间的相互作用如何影响活性区和死区之间界面处涡流的形成和演化。使用 Godunov 代码 RAMSES，我们对 MRI 的圆柱形模型（湍流原行星盘）进行了 3D 磁流体动力学全局数值模拟，包括热力学效应以及与温度相关的电阻率。与类似的二维粘性模拟的比较已被广泛用于帮助识别相关的物理过程和磁盘的长期演变。我们发现，由于罗斯贝波不稳定性，在界面处形成的涡旋向内迁移并穿透活动区，在活动区被湍流运动破坏。随后，几十个轨道后，在界面处出现了一个新的涡旋，并且新的涡旋也向内迁移。该序列不断重复，导致涡流形成、迁移和破坏的循环。使用两个不同的代码成功地重现了此行为。在本文中，我们描述了这种涡旋生命周期的特征，并讨论了它对死/活界面上行星形成的影响。我们的模拟强调了热力学过程对于死区内边缘涡流演化的重要性。
In protoplanetary disks, the inner boundary between the turbulent and laminar regions is a promising site for planet formation because solids may become trapped at the interface itself or in vortices generated by the Rossby wave instability. The disk thermodynamics and the turbulent dynamics at that location are entwined because of the importance of turbulent dissipation on thermal ionization and, conversely, of thermal ionisation on the turbulence. However, most previous work has neglected this dynamical coupling and have thus missed a key element of the physics in this region. In this paper, we aim to determine how the the interplay between ionization and turbulence impacts on the formation and evolution of vortices at the interface between the active and the dead zones. Using the Godunov code RAMSES, we have performed a 3D magnetohydrodynamic global numerical simulation of a cylindrical model of an MRI--turbulent protoplanetary disk, including thermodynamical effects as well as a temperature-dependant resistivity. The comparison with an analogous 2D viscous simulation has been extensively used to help identify the relevant physical processes and the disk's long-term evolution. We find that a vortex formed at the interface, due to Rossby wave instability, migrates inward and penetrates the active zone where it is destroyed by turbulent motions. Subsequently, a new vortex emerges a few tens of orbits later at the interface, and the new vortex migrates inward too. The sequence repeats itself, resulting in cycles of vortex formation, migration, and disruption. This behavior is successfully reproduced using two different codes. In this paper, we characterize this vortex life cycle and discuss its implications for planet formation at the dead/active interface. Our simulations highlight the importance of thermodynamical processes for the vortex evolution at the dead zone inner edge.
DOI：
10.1088/0004-637x/764/2/146
发表时间：
2012-08
期刊：
The Astrophysical Journal
影响因子：
--
作者：
P. Garaud;F. Meru;M. Galvagni;C. Olczak
通讯作者：
P. Garaud;F. Meru;M. Galvagni;C. Olczak
微观尘埃聚集体的弹跳行为
影响因子：
6.5
作者：
Seizinger
通讯作者：
Seizinger