论文标题
年轻恒星物体的磁盘，流出和磁场的早期演变：灰尘模型的影响
Early evolution of disk, outflow, and magnetic field of young stellar objects: Impact of dust model
论文作者
论文摘要
使用三维非理想的磁力流动力学模拟研究了低质量年轻恒星物体（YSO）的形成和早期演变。我们研究了原恒星形成后YSO的演变，直至〜10^4年，在该YSO的演化中，原恒星质量达到〜0.1 m_ \ odoT。我们特别关注尘埃模型对进化的影响。我们发现，无论灰尘模型如何，在所有模拟中均形成了偶性磁盘。在原恒星形成时期，磁盘尺寸约为10个AU，在原恒星形成后，在〜10^4年的几十个AU中增加了磁盘的大小。磁盘质量与中央原始质量质量相当，而引力不稳定性也会发展出来。在灰尘尺寸较小的模拟中，伪模形的经纱在原恒星形成后发育〜10^4年。经线可以加强磁盘中的磁制动，并减小磁盘尺寸。在典型的灰尘大小为\ gtrsim0.2μm并且原恒星（加磁盘）质量为m \ gtrsim 0.1 m_ \ odot的条件下，离子中性漂移可能发生在插入的包膜中。流出活动与灰尘尺寸相关，而强烈的尘土谷物出现强大的流出。
The formation and early evolution of low mass young stellar objects (YSOs) are investigated using three-dimensional non-ideal magneto-hydrodynamics simulations. We investigate the evolution of YSOs up to ~ 10^4 yr after protostar formation, at which protostellar mass reaches ~ 0.1 M_\odot . We particularly focus on the impact of the dust model on the evolution. We found that a circumstellar disk is formed in all simulations regardless of the dust model. Disk size is approximately 10 AU at the protostar formation epoch, and it increases to several tens of AU at ~ 10^4 yr after protostar formation. Disk mass is comparable to central protostellar mass and gravitational instability develops. In the simulations with small dust size, the warp of the pseudodisk develops ~ 10^4 yr after protostar formation. The warp strengthens magnetic braking in the disk and decreases disk size. Ion-neutral drift can occur in the infalling envelope under the conditions that the typical dust size is a \gtrsim 0.2μm and the protostar (plus disk) mass is M \gtrsim 0.1 M_\odot. The outflow activity is anti-correlated to the dust size and the strong outflow appears with small dust grains.
