The nature of low T/|W| dynamical instabilities in differentially rotating stars

被引：88
作者：
Watts, AL
Andersson, N
Jones, DI
机构：
[1] NASA, Goddard Space Flight Ctr, High Energy Astrophys Lab, Greenbelt, MD 20771 USA
[2] Univ Southampton, Sch Math, Southampton SO17 1BJ, Hants, England
[3] Penn State Univ, Ctr Gravitat Wave Phys, Davey Lab 104, University Pk, PA 16802 USA
来源：
ASTROPHYSICAL JOURNAL | 2005年 / 618卷 / 01期
基金：
美国国家科学基金会;
关键词：
gravitational waves; hydrodynamics; instabilities; stars : neutron; stars : rotation;
D O I：
10.1086/427653
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Recent numerical simulations indicate the presence of dynamical instabilities of the f-mode in differentially rotating stars even at very low values of T/\W\, the ratio of kinetic to potential energy. In this Letter we argue that these may be shear instabilities that occur when the degree of differential rotation exceeds a critical value and when the f-mode develops a corotation point associated with the presence of a continuous spectrum. Our explanation, which is supported by detailed studies of a simple shell model, offers a straightforward way of understanding all of the key features of these instabilities.
引用
收藏
页码：L37 / L40
页数：4
相关论文
共 50 条
[41]   THE PRODUCTION OF TURBULENCE BY GRAVITATIONAL INSTABILITIES IN SELF-GRAVITATING DIFFERENTIALLY ROTATING-DISKS [J].
EBERT, R .
ASTRONOMY & ASTROPHYSICS, 1994, 286 (03) :997-1005
[42]   ON THE NATURE OF RAPIDLY ROTATING SINGLE EVOLVED STARS [J].
Rodrigues da Silva, R. ;
Canto Martins, B. L. ;
De Medeiros, J. R. .
ASTROPHYSICAL JOURNAL, 2015, 801 (01)
[43]   Gravitational radiation reaction driven secular instability of f-mode oscillations in differentially rotating Newtonian stars [J].
Karino, S ;
Eriguchi, Y .
ASTROPHYSICAL JOURNAL, 2002, 578 (01) :413-419
[44]   A new gravitational-wave signature of low-T/|W| instability in rapidly rotating stellar core collapse [J].
Shibagaki, Shota ;
Kuroda, Takami ;
Kotake, Kei ;
Takiwaki, Tomoya .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2020, 493 (01) :L138-L142
[45]   Tidal inertial waves in differentially rotating convective envelopes of low-mass stars I. Free oscillation modes [J].
Guenel, M. ;
Baruteau, C. ;
Mathis, S. ;
Rieutord, M. .
ASTRONOMY & ASTROPHYSICS, 2016, 589
[46]   The long-term rotation dynamics of neutron stars with differentially rotating unmagnetized core [J].
Barsukov, D. P. ;
Goglichidze, O. A. ;
Tsygan, A. I. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2014, 444 (02) :1318-1333
[47]   Frequencies of f-modes in differentially rotating relativistic stars and secular stability limits [J].
Yoshida, S ;
Rezzolla, L ;
Karino, S ;
Eriguchi, Y .
ASTROPHYSICAL JOURNAL, 2002, 568 (01) :L41-L44
[48]   Linear stability analysis of differentially rotating polytropes:: New results for the m=2 f-mode dynamical instability [J].
Karino, S ;
Eriguchi, Y .
ASTROPHYSICAL JOURNAL, 2003, 592 (02) :1119-1123
[49]   On convective instabilities and differential rotation in rapidly rotating stars: A new quasi-geostrophic approximation [J].
Liao, XH ;
Zhang, KK ;
Feng, TH .
ASTROPHYSICAL JOURNAL, 2005, 631 (01) :518-528
[50]   Dynamical tides excited in rotating stars of different masses and ages and the formation of close in orbits [J].
Chernov, S. V. ;
Papaloizou, J. C. B. ;
Ivanov, P. B. .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2013, 434 (02) :1079-1097
12345