Modeling the Planetesimal formation Process and Its Comparison to Observations of Vega-like stars

我们研究小行星的形成过程。研究了在气盘中面形成的尘埃层引起的湍流、尘埃层的自重、颗粒电荷和碰撞破碎。我们推导出了小行星形成所需气盘的性质。为了将小行星形成理论与类织女星的观测结果相比较，我们研究了恒星辐射和盘状气体对尘埃盘结构的影响。我们还进行了尘埃粒子高速碰撞的实验研究，得到了碰撞碎片的尺寸分布。最后，我们通过对过渡盘的观测，得到了气盘的性质，认为过渡盘是织女星样盘的前一阶段。

We study planetesimal formation processes. The following effects are studied : turbulence induced by the dust layer formed at the midplane of the gas disks, self-gravity of the dust layer, grain charges, and collisional fragmentation. We derived properties of the gas disks required for planetesimal formation. In order to compare the planetesimal formation theory to the observations of Vega-like stars, we study dust disk structure affected by the stellar radiation and the disk gas. We have also performed experimental studies of high velocity collisions of dust particles and derived the size distribution of collisional fragments. Finally, we derived the gas disk properties from the observation of the transitional disk, which is considered to be a former stage of Vega-like disks.