论文标题
旋转行星周围圆周磁盘的边界层I.罗斯比波的影响
Boundary Layers of Circumplanetary Disks around Spinning Planets I. Effects of Rossby Waves
论文作者
论文摘要
据信天然气巨型行星从其圆周磁盘（CPD）中积聚。 CPD通常涉及行星附近边界层（BL）的积聚。先前的研究集中在非旋转行星的BL上。我们研究了行星旋转对BL内波行为的影响。这种BLS中的旋转曲线将显示从刚性旋转到开普勒旋转的急剧过渡。我们根据线性扰动分析研究了这些BL中的角动量传输。我们发现，与旋转行星相关的全球惯性声学模式将导致角动量的流入和气体的积聚。在这项工作中，我们确定了一种新型的全球模式，即Rossby模式。 Rossby模式可以导致角动量的流出和从旋转行星中的气体解析。罗斯比模式提供了负面反馈，可以调节行星旋转和质量。我们将两种模式的生长速率与BL宽度，马赫数和行星旋转速率的函数进行比较。我们的结果揭示了末端自旋和巨型行星的渐近质量的潜在流体动力机制。
Gas giant planets are believed to accrete from their circumplanetary disks (CPDs). The CPDs usually involve accretion through the boundary layer (BL) in the vicinity of planets. Prior studies have concentrated on the BL of non-spinning planets. We investigate the influence of planetary spin on the wave behaviors within the BL. The rotation profile in such BLs would show sharp transition from the rigid rotation to the Keplerian rotation. We examine the angular momentum transport in these BL in terms of linear perturbation analysis. We find that the global inertia-acoustic mode associated with spinning planets would give rise to the inflow of angular momentum and the accretion of gas. In this work, we identify a new kind of global mode, namely the Rossby mode. The Rossby mode can lead to the outflow of angular momentum and the decretion of gas from a spinning planet. The Rossby mode provide a negative feedback that regulates the planetary spin and mass. We compare the growth rate of the two modes as a function of the width of BL, the Mach number and the spin rate of planet. Our results reveal the underlying hydrodynamic mechanism of terminal spins and asymptotic mass of the giant planets.
