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A New Type of Thermonuclear Supernova, and How the Pulsar Got his Spin
Novel Explosions: A New Type of Thermonuclear Supernova, and How the Pulsar Got his Spin John M. Blondin NC State University NCSU Physics Colloquium
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Remnants of Core-Collapse Supernovae
Relic Blastwave Spinning Neutron Star NCSU Physics Colloquium
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The Supernova story has a long history of computational physics…
1966 Colgate and White Neutrino-Driven prompt explosion 1985 Bethe and Wilson Shock reheating via neutrino energy deposition 1992 Herant, Benz, and Colgate Convective instability above neutrino-sphere 1957 Burbidge^2 Fowler Hoyle NCSU Physics Colloquium
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Anatomy of a Core-Collapse Supernova
The last decade has seen a great deal of interest in multidimensional effects: Convection with the proto-neutron star Neutrino-driven convection below the stalled shock Instability of the stalled shock All of these may operate together! NCSU Physics Colloquium
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First generation of 2D SN models hinted at
a low-order asymmetry in the shock wave at late times (100’s of msec after bounce). Burrows, Hayes & Fryxell 1995 NCSU Physics Colloquium
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To investigate the dynamics of the stalled supernova shock,
we consider an idealized problem: NCSU Physics Colloquium
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SN Code Verification Houck and Chevalier 1992 Blondin and Mezzacappa 2005 This post-bounce model provides an opportunity to verify supernova codes against the results of a linear perturbation analysis. NCSU Physics Colloquium
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Spherical Accretion Shock Instability
Blondin, Mezzacappa, DeMarino 2003, ApJ, 584, 971 NCSU Physics Colloquium
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The SASI is a global acoustic mode:
The spherical accretion shock acts as an acoustic cavity, with a trapped standing wave growing exponentially with time. NCSU Physics Colloquium
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Must move to 3D! This initial SASI discovery with axisymmetric 2D simulations pointed to the obvious need for models in full 3D. Add picture of bi-polar SASI NCSU Physics Colloquium
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NCSU Physics Colloquium
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NCSU Physics Colloquium
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NCSU Physics Colloquium
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NCSU Physics Colloquium
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NCSU Physics Colloquium
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NCSU Physics Colloquium
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NCSU Physics Colloquium
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NCSU Physics Colloquium
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NCSU Physics Colloquium
50 rotational period (ms) 100 200 NCSU Physics Colloquium
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NCSU Physics Colloquium
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SASI A non-rotating, spherically symmetric progenitor star can leave
behind a neutron star spinning with a period of tens of milliseconds. NCSU Physics Colloquium
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