PARAMETRIC STUDY OF THE ROSSBY WAVE INSTABILITY IN A TWO-DIMENSIONAL BAROTROPIC DISK
PARAMETRIC STUDY OF THE ROSSBY WAVE INSTABILITY IN A TWO-DIMENSIONAL BAROTROPIC DISK
复制标题
DOI：
10.3847/0004-637x/823/2/84
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
T. Ono;T. Muto;T. Takeuchi;H. Nomura
中科院分区：
文献类型：
--
作者：
T. Ono;T. Muto;T. Takeuchi;H. Nomura
已经观察到具有非轴对称结构的原行星盘。Rossby波不稳定性（RWI）被认为是非轴对称结构的起源之一。我们进行线性稳定性分析的RWI在正压气流中使用四种代表性类型的背景流在一个广泛的参数空间。我们发现，共同旋转半径位于背景涡度最小值与大的涡度，如果系统是边缘稳定的RWI，这使我们能够很容易地检查对RWI的稳定性。我们重新推导了半解析形式的RWI开始的充分必要条件。我们讨论了新的条件在现实系统中的适用性和RWI的物理性质。
Protoplanetary disks with non-axisymmetric structures have been observed. The Rossby wave instability (RWI) is considered as one of the origins of the non-axisymmetric structures. We perform linear stability analyses of the RWI in barotropic flow using four representative types of the background flow on a wide parameter space. We find that the co-rotation radius is located at the background vortensity minimum with large concavity if the system is marginally stable to the RWI, and this allows us to easily check the stability against the RWI. We newly derive the necessary and sufficient condition for the onset of the RWI in semi-analytic form. We discuss the applicability of the new condition in realistic systems and the physical nature of the RWI.