Rossby wave instability in accretion discs with large-scale poloidal magnetic fields

	Rossby wave instability in accretion discs with large-scale poloidal magnetic fields
	Yu C(余聪)1,2,3 ; Lai, D 2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2013-03
卷号	429 期号:3 页码:2748-2754
关键词	accretion, accretion discs hydrodynamics magnetic fields planets and satellites: magnetic fields waves
ISSN号	0035-8711
通讯作者	Yu, C (reprint author), Chinese Acad Sci, Yunnan Astron Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	We study the effect of large-scale magnetic fields on the non-axisymmetric Rossby wave instability (RWI) in accretion discs. The instability develops around a density bump, which is likely present in the transition region between the active zone and dead zone of protoplanetary discs. Previous works suggest that the vortices resulting from the RWI may facilitate planetesimal formation and angular momentum transport. We consider discs threaded by a large-scale poloidal magnetic field, with a radial field component at the disc surface. Such field configurations may lead to the production of magnetic winds or jets. In general, the magnetic field can affect the RWI even when it is sub-thermal (plasma beta similar to 10). For infinitely thin discs, the instability can be enhanced by about 10 per cent. For discs with finite thickness, with a radial gradient of the magnetic field strength, the RWI growth rate can increase significantly (by a factor of similar to 2) as the field approaches equipartition (beta similar to 1). Our result suggests that the RWI can continue to operate in discs that produce magnetic winds.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	COROTATIONAL INSTABILITY ; PROTOPLANETARY DISCS ; EJECTION INSTABILITY ; PLANET INTERACTIONS ; DISKS ; VORTICES ; STABILITY ; MIGRATION ; MODES ; OSCILLATIONS
收录类别	SCI
原文出处	http://mnras.oxfordjournals.org/content/429/3/2748
语种	英语
WOS记录号	WOS:000318271300069
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4559]
专题	云南天文台_大样本恒星演化研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.National Astronomical Observatories/Yunnan Astronomical Observatory, Chinese Academy of Sciences, Kunming 650011, China 2.Department of Astronomy, Cornell University, Ithaca, NY 14853, USA 3.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China
推荐引用方式 GB/T 7714	Yu C,Lai, D. Rossby wave instability in accretion discs with large-scale poloidal magnetic fields[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,429(3):2748-2754.
APA	Yu C,&Lai, D.(2013).Rossby wave instability in accretion discs with large-scale poloidal magnetic fields.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,429(3),2748-2754.
MLA	Yu C,et al."Rossby wave instability in accretion discs with large-scale poloidal magnetic fields".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 429.3(2013):2748-2754.