The magnetization of protoplanetary discs

被引：6

作者：

Birk, GT ^{[1
]}

Wiechen, H

Kopp, A

Lesch, H

机构：

[1] Univ Munich, Inst Astron & Astrophys, Munich, Germany

[2] Ctr Interdisciplinary Plasma Sci, Garching, Germany

[3] Ruhr Univ Bochum, D-4630 Bochum, Germany

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2003年 / 339卷 / 02期

关键词：

accretion; accretion discs; magnetic fields; circumstellar matter; planetary systems : protoplanetary discs;

D O I：

10.1046/j.1365-8711.2003.06178.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The remanent magnetization of meteorite material in the Solar system indicates that magnetic fields of several gauss are present in the protoplanetary disc. It is shown that such relatively strong magnetic fields can be generated in dusty protoplanetary discs by relative shear motions of the charged dust and the neutral gas components. Self-consistent multi-fluid simulations show that, for typical plasma parameters, shear flows with collisional momentum transfer between the different components of the dusty plasma result in a very efficient generation of magnetic fields with strengths of about 0.1-1 G on spatial scales of two astronomical units in about one year. Based on the simulations we may predict that future measurements will reveal the strong magnetization of circumstellar discs around young stellar objects.

引用

页码：455 / 459

页数：5

共 20 条

[1] A POWERFUL LOCAL SHEAR INSTABILITY IN WEAKLY MAGNETIZED DISKS .1. LINEAR-ANALYSIS [J].