Twin Jets and Close Binary Formation

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 a...

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Bibliographic Details
Published in:arXiv.org 2020-06
Main Authors: Saiki, Yu, Machida, Masahiro N
Format: Article
Language:English
Subjects:
Accretion disks
Jets
Magnetohydrodynamic simulation
Magnetohydrodynamics
Outflow
Protostars
Star formation
Telescopes
Velocity
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Summary: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 \(
ISSN:2331-8422
DOI:10.48550/arxiv.2006.10243