论文标题
两个晶粒的故事：晶粒尺寸通过非理想的MHD过程对环形成的影响
A Tale of Two Grains: impact of grain size on ring formation via nonideal MHD processes
论文作者
论文摘要
PPD中的子结构被最近的ALMA观察揭示了其无处不在的，因此广泛讨论了其可能的起源。我们在轴对称性中进行全局全磁性水力动力学（MHD）模拟，并与自洽的射线追踪辐射转移，热化学和非理想的MHD扩散率一起进行。还基于全球尘埃演化计算（包括烧结效应）来计算晶粒的丰度曲线。我们发现，通过积聚过程，尘埃尺寸在原月球磁盘（PPD）周围的雪线周围的环形成中起着至关重要的作用。磁盘电离结构以及张力电导率取决于谷物的大小。当晶粒明显大于PAH时，非理想的MHD电导率在主要挥发物的每个雪线上都发生了巨大变化，从而导致雪线突然改变了雪线的增生过程，并在那里散布了降雪层/间隙/间隙的随后形成。另一方面，电导率的变化要少得多，而磁盘中只有PAH尺寸的晶粒，然后这些磁盘保留了跨雪线的更平滑的径向密度曲线。
Substructures in PPDs, whose ubiquity was unveiled by recent ALMA observations, are widely discussed regarding their possible origins. We carry out global full magnetohydrodynamic (MHD) simulations in axisymmetry, coupled with self-consistent ray-tracing radiative transfer, thermochemistry, and non-ideal MHD diffusivities. The abundance profiles of grains are also calculated based on the global dust evolution calculation, including sintering effects. We found that dust size plays a crucial role in the ring formation around the snow lines of protoplanetary disks (PPDs) through the accretion process. Disk ionization structures and thus tensorial conductivities depend on the size of grains.When grains are significantly larger than PAHs, the non-ideal MHD conductivities change dramatically across each snow line of major volatiles, leading to a sudden change of the accretion process across the snow lines and the subsequent formation of gaseous rings/gaps there. On the other hand,the variations of conductivities are a lot less with only PAH sized grains in disks and then these disks retain smoother radial density profiles across snow lines.
