The Observability of Vortex-driven Spiral Arms in Protoplanetary Disks: Basic Spiral Properties
The Observability of Vortex-driven Spiral Arms in Protoplanetary Disks: Basic Spiral Properties
复制标题
原行星盘中涡旋驱动旋臂的可观测性：基本螺旋属性
DOI：
10.3847/2041-8213/ab40c4
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Jianghui Ji
中科院分区：
文献类型：
--
作者：
Pinghui Huang;Ruobing Dong;Hui Li;Shengtai Li;Jianghui Ji
在红外散射光或(亚)毫米尘埃连续体中，观察到一些恒星圆盘显示出突出的旋臂。螺旋线可能是由自重、阴影或行星-圆盘相互作用形成的。最近，有人假设，巨大的漩涡可以驱动原行星盘中的螺旋臂，其方式类似于行星。本文研究了二维流体动力学模拟中Rossby波不稳定性对涡旋驱动的基本性质。我们研究了旋涡驱动螺线的表面密度对比度、数量和形状如何依赖于旋涡的性质。我们还比较了涡旋驱动的螺旋线和行星引起的螺旋线。在我们的模拟中，由涡旋驱动的螺旋线的表面密度对比度与由亚热质量行星驱动的旋涡螺旋线的表面密度对比度相当，通常是几到几十个地球质量。此外，与后者不同的是，前者对旋涡的质量不敏感。在目前的散射光观测中，涡旋驱动的螺旋臂预计不会被探测到，而且在少数原行星盘，如SAO 206462(HD 135344B)、MWC758和LkHA330中，在散射光中观察到的显著螺旋不太可能被其中的候选涡旋诱导。
Some circumstellar disks are observed to show prominent spiral arms in infrared scattered light or (sub-)millimeter dust continuum. The spirals might be formed from self-gravity, shadows, or planet-disk interactions. Recently, it was hypothesized that massive vortices can drive spiral arms in protoplanetary disks in a way analogous to planets. In this paper, we study the basic properties of vortex-driven spirals by the Rossby Wave Instability in 2D hydrodynamics simulations. We study how the surface density contrast, the number, and the shape of vortex-driven spirals depend on the properties of the vortex. We also compare vortex-driven spirals with those induced by planets. The surface density contrast of vortex-driven spirals in our simulations are comparable to those driven by a sub-thermal mass planet, typically a few to a few tens of Earth masses. In addition, different from the latter, the former is not sensitive to the mass of the vortex. Vortex-driven spiral arms are not expected to be detectable in current scattered light observations, and the prominent spirals observed in scattered light in a few protoplanetary disks, such as SAO 206462 (HD 135344B), MWC 758, and LkHa 330, are unlikely to be induced by the candidate vortices in them.