论文标题
双流喷气机和近距离二进制形成
Twin Jets and Close Binary Formation
论文作者
论文摘要
使用三维电阻磁性水力学模拟研究了近距离二元系统的形成。从Prestell云开始，计算云的演化，直到质体形成后约400年。碎裂发生在重力崩溃的云中，两个碎片演变成质子。质子互相绕并且出现了质子系统。广角低速流出来自包围两个原始恒星的环形流，而每个原子型都会发动高速射流。因此，两个高速喷气机被低速电路流出所包围。喷气机的速度超过$ \ gtrsim 100 km s^{ - 1} $。尽管喷气机具有准直的结构，但由于二进制轨道运动，它们又弯曲回去，并在大规模上纠结。每个原子盘周围也出现了一个偶性磁盘。在主要积聚阶段，二进制轨道很复杂，而二进制分离在$ <30 $ au之内。最近，在数值模拟中重现了最近使用大型望远镜观察到的原始系统的所有特征。
The formation of a close binary system is investigated using a three-dimensional resistive magnetohydrodynamics simulation. Starting from a prestellar cloud, the cloud evolution is calculated until about 400 yr after protostar formation. Fragmentation occurs in the gravitationally collapsing cloud and two fragments evolve into protostars. The protostars orbit each other and a protobinary system appears. A wide-angle low-velocity outflow emerges from the circumbinary streams that encloses two protostars, while each protostar episodically drives high-velocity jets. Thus, the two high-velocity jets are surrounded by the low-velocity circumbinary outflow. The speed of the jets exceeds $\gtrsim 100 km s^{-1}$. Although the jets have a collimated structure, they are swung back on the small scale and are tangled at the large scale due to the binary orbital motion. A circumstellar disk also appears around each protostar. In the early main accretion phase, the binary orbit is complicated, while the binary separation is within $<30$ au. For the first time, all the characteristics of protobinary systems recently observed with large telescopes are reproduced in a numerical simulation.
