干旱区生态环境知识资源中心(Arid): Global simulations of Tayler instability in stellar interiors: the stabilizing effect of gravity

Arid

DOI	10.1093/mnras/stz2849
	Global simulations of Tayler instability in stellar interiors: the stabilizing effect of gravity
	Guerrero, G.1; Del Sordo, F.2,3; Bonanno, A.4; Smolarkiewicz, P. K.5
通讯作者	Guerrero, G. ; Del Sordo, F.
来源期刊	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN	0035-8711
EISSN	1365-2966
出版年	2019
卷号	490 期号:3 页码:4281-4291
英文摘要	Unveiling the evolution of toroidal field instability, known as Tayler instability, is essential to understand the strength and topology of the magnetic fields observed in early-type stars, in the core of the red giants, or in any stellar radiative zone. We want to study the non-linear evolution of the instability of a toroidal field stored in a stably stratified layer, in spherical symmetry and in the absence of rotation. In particular, we intend to quantify the suppression of the instability as a function of the Brunt-Vaisala (omega(BV)) and the Alfven (omega(A)) frequencies. We use the magnetohydrodynamic (MHD) equations as implemented in the anelastic approximation in the EULAG-MHD code and perform a large series of numerical simulations of the instability exploring the parameter space for the. omega(BV) and omega(A). We show that beyond a critical value gravity strongly suppress the instability, in agreement with the linear analysis. The intensity of the initial field also plays an important role: weaker fields show much slower growth rates. Moreover, in the case of very low gravity, the fastest growing modes have a large characteristic radial scale, at variance with the case of strong gravity, where the instability is characterized by horizontal displacements. Our results illustrate that the anelastic approximation can efficiently describe the evolution of toroidal field instability in stellar interiors. The suppression of the instability as a consequence of increasing values of omega(BV) might play a role to explain the magnetic desert in Ap/Bp stars, since weak fields are only marginally unstable in the case of strong gravity.
英文关键词	MHD stars: magnetic field
类型	Article
语种	英语
国家	Brazil ; Greece ; Italy ; England
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000503993100086
WOS关键词	TOROIDAL MAGNETIC-FIELDS ; ADIABATIC STABILITY ; STARS ; EQUILIBRIA
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
EI主题词	2019-12-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311040
作者单位	1.Univ Fed Minas Gerais, Dept Phys, Ave Antonio Carlos 6627, BR-31270901 Belo Horizonte, MG, Brazil; 2.FORTH, Inst Astrophys, GR-71110 Iraklion, Greece; 3.Univ Crete, Dept Phys, GR-70013 Iraklion, Greece; 4.INAF, Osservatorio Astrofis Catania, Via S Sofia 78, I-95123 Catania, Italy; 5.European Ctr Medium Range Weather Forecasts, Reading RG2 9AX, Berks, England
推荐引用方式 GB/T 7714	Guerrero, G.,Del Sordo, F.,Bonanno, A.,et al. Global simulations of Tayler instability in stellar interiors: the stabilizing effect of gravity[J],2019,490(3):4281-4291.
APA	Guerrero, G.,Del Sordo, F.,Bonanno, A.,&Smolarkiewicz, P. K..(2019).Global simulations of Tayler instability in stellar interiors: the stabilizing effect of gravity.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,490(3),4281-4291.
MLA	Guerrero, G.,et al."Global simulations of Tayler instability in stellar interiors: the stabilizing effect of gravity".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 490.3(2019):4281-4291.