Vortices in Protoplanetary Disks
Vortices in Protoplanetary Disks
复制标题
原行星盘中的漩涡
DOI：
10.1086/307720
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
M. Livio
中科院分区：
文献类型：
--
作者：
P. Godon;M. Livio
我们使用高阶精度的谱码来进行二维的、随时间变化的吸积盘漩涡的数值模拟。特别地，我们研究了年轻恒星物体周围的星周盘中漩涡的稳定性和寿命。结果表明，气旋涡旋消散速度快，而反气旋涡旋可以在气流中存在数百个轨道。当存在多个涡旋时，反气旋涡旋通过涡度波相互作用并合并形成更大的涡旋。当黏度参数α≈10-4时，反气旋涡旋的指数衰减时间τ约为30-60个轨道周期（当α = 10-5时，指数衰减时间τ增加到τ≈315），这足以使重尘埃粒子在原行星盘中快速聚集在反气旋涡旋的核心。这种尘埃浓度增加了厘米大小颗粒的局部密度，从而有利于形成更大规模的物体，从而能够有效地引发引力不稳定状态。因此，这里讨论的相对长寿的涡旋可能在巨行星的形成过程中起着关键作用。
We use a high-order accuracy spectral code to carry out two-dimensional, time-dependent numerical simulations of vortices in accretion disks. In particular, we examine the stability and the lifetime of vortices in circumstellar disks around young stellar objects. The results show that cyclonic vortices dissipate quickly, while anticyclonic vortices can survive in the flow for hundreds of orbits. When more than one vortex is present, the anticyclonic vortices interact through vorticity waves and merge together to form larger vortices. The exponential decay time τ of anticyclonic vortices is of the order of 30-60 orbital periods for a viscosity parameter α ≈ 10-4 (and it increases to τ ≈ 315 for α = 10-5), which is sufficiently long to allow heavy dust particles to rapidly concentrate in the core of anticyclonic vortices in protoplanetary disks. This dust concentration increases the local density of centimeter-sized grains, thereby favoring the formation of larger scale objects that are then capable of efficiently triggering a state of gravitational instability. The relatively long-lived vortices discussed here may therefore play a key role in the formation process of giant planets.
影响因子：
3.2
作者：
V. Mannings;A. Boss;S. Russell
通讯作者：
V. Mannings;A. Boss;S. Russell