Late-time convection in the collapse of a 23M⊙ star

被引:62
作者
Fryer, Christopher L. [1 ]
Young, Patrick A.
机构
[1] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA
[2] LANL, Div Theoret, Los Alamos, NM 87545 USA
[3] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA
关键词
gamma rays : bursts; nuclear reactions; nucleosynthesis; abundances; supernovae : general;
D O I
10.1086/513003
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The results of a three-dimensional SNSPH simulation of the core collapse of a 23 M-circle dot star are presented. This simulation did not launch an explosion until over 600 ms after collapse, allowing an ideal opportunity to study the evolution and structure of the convection below the accretion shock to late times. This late-time convection allows us to study several of the recent claims in the literature about the role of convection: is it dominated by an l = 1 mode driven by vortical-acoustic ( or other) instability, does it produce strong neutron star kicks, and, finally, is it the key to a new explosion mechanism? The convective region buffets the neutron star, imparting a 150-200 km s(-1) kick. Because the l = 1 mode does not dominate the convection, the neutron star does not achieve large (> 450 km s(-1)) velocities. Finally, the neutron star in this simulation moves but does not develop strong oscillations, the energy source for a recently proposed supernova engine. We discuss the implications these results have for supernovae, hypernovae (and gamma-ray bursts), and stellar-mass black holes.
引用
收藏
页码:1438 / 1448
页数:11
相关论文
共 54 条
[1]   VON-NEUMANN STABILITY ANALYSIS OF SMOOTHED PARTICLE HYDRODYNAMICS - SUGGESTIONS FOR OPTIMAL-ALGORITHMS [J].
BALSARA, DS .
JOURNAL OF COMPUTATIONAL PHYSICS, 1995, 121 (02) :357-372
[2]   Two-dimensional hydrodynamics of pre-core collapse: Oxygen shell burning [J].
Bazan, G ;
Arnett, D .
ASTROPHYSICAL JOURNAL, 1998, 496 (01) :316-332
[3]  
Benz W, 1997, NATO ADV SCI I C-MAT, V486, P457
[4]   The spherical accretion shock instability in the linear regime [J].
Blondin, JM ;
Mezzacappa, A .
ASTROPHYSICAL JOURNAL, 2006, 642 (01) :401-409
[5]   Stability of standing accretion shocks, with an eye toward core-collapse supernovae [J].
Blondin, JM ;
Mezzacappa, A ;
DeMarino, C .
ASTROPHYSICAL JOURNAL, 2003, 584 (02) :971-980
[6]  
BRAGINSKII SI, 1958, SOV PHYS JETP-USSR, V6, P358
[7]  
BRUEM SW, 2004, ASTROPH0404099
[8]   Two-dimensional hydrodynamic core-collapse supernova simulations with spectral neutrino transport -: I.: Numerical method and results for a 15 M⊙ star [J].
Buras, R ;
Rampp, M ;
Janka, HT ;
Kifonidis, K .
ASTRONOMY & ASTROPHYSICS, 2006, 447 (03) :1049-U136
[9]   Improved models of stellar core collapse and still no explosions: What is missing? [J].
Buras, R ;
Rampp, M ;
Janka, HT ;
Kifonidis, K .
PHYSICAL REVIEW LETTERS, 2003, 90 (24) :4-241101
[10]   A new mechanism for core-collapse supernova explosions [J].
Burrows, A ;
Livne, E ;
Dessart, L ;
Ott, CD ;
Murphy, J .
ASTROPHYSICAL JOURNAL, 2006, 640 (02) :878-890