Numerical study of the knot structure in scaled protostellar jets by laboratory laser-driven plasmas

被引：9

作者：

Lei, Z. ^{[1
,2
]}

Zhao, Z. H. ^{[1
,2
]}

Yao, W. P. ^{[3
,4
]}

Xie, Y. ^{[1
,2
]}

Jiao, J. L. ^{[1
,2
]}

Zhou, C. T. ^{[5
]}

Zhu, S. P. ^{[6
]}

He, X. T. ^{[6
]}

Qiao, B. ^{[1
,2
]}

机构：

[1] Peking Univ, Sch Phys, HEDPS, Ctr Appl Phys, Beijing 100871, Peoples R China

[2] Peking Univ, Sch Phys, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

[3] Sorbonne Univ, Ecole Polytech, Inst Polytech Paris, LULI CNRS,CEA, F-91128 Palaiseau, France

[4] Univ PSL, Sorbonne Univ, Observ Paris, CNRS, F-75005 Paris, France

[5] Shenzhen Technol Univ, Ctr Adv Mat Diagnost Technol, Shenzhen 518118, Peoples R China

[6] Inst Appl Phys & Computat Math, Beijing 100094, Peoples R China

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2020年 / 62卷 / 09期

基金：

国家杰出青年科学基金; 中国国家自然科学基金;

关键词：

laser plasma; collimated jets; magnetic field; knot structures; radiation magnetohydrodynamic simulation; RADIATIVELY COOLING JETS; MAGNETIC-FIELDS; EXPERIMENTAL ASTROPHYSICS; PROPER MOTIONS; COLLIMATION; HH-34; DECELERATION; STABILITY; ACCRETION; OUTFLOW;

D O I：

10.1088/1361-6587/aba4be

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Knot structures exist ubiquitously in young stellar object (YSO) jets, which are a key tracer in astronomical observation to estimate the jet properties and eventually the YSO's parameters (age, size, mass and so on). Using 2D and 3D radiation magnetohydrodynamic simulations of the laser-produced plasma jets in external poloidal magnetic fields, we present a systematic analysis on the formation mechanism and characteristics of knot structures in collimated jets. The simulations demonstrate that the multi-knot pattern in jets can be formed by the oblique internal shocks in only single ejection. It is found that the distance L between different knots in jet is determined by the ratio of its thermal pressure to magnetic pressure beta as L alpha D beta(1/2), where D is the jet transverse diameter. There is a factor about 0.4-0.6 between the knot and jet velocities. And radiation cooling effect can alleviate the intensity of the external magnetic field required for collimating jets. These findings are scaled to the conditions of YSO jets, and can be applied to explore some characteristics of the astrophysical jets.

引用

页数：9

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