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          Institute: MPI für Gravitationsphysik     Collection: Astrophysical Relativity     Display Documents

ID: 293698.0, MPI für Gravitationsphysik / Astrophysical Relativity
An acoustic mechanism for core-collapse supernova explosions
Authors:Burrows, Adam; Livne, Eli; Dessart, Luc; Ott, Christian D.; Murphy, Jeremiah
Date of Publication (YYYY-MM-DD):2006-10
Title of Journal:New Astronomy Reviews
Volume (in Journal):50
Issue / Number:7-8
Full Name of Issue-Editor(s):Dieter Hartmann, Roland Diehl, Nikos Prantzos and Ernst Zinner
Start Page:469
End Page:648
Name of Conference/Meeting:Astronomy with Radioactivities. V
Place of Conference/Meeting:Clemson, SC, USA
(Start) Date of Conference/Meeting
Review Status:not specified
Audience:Not Specified
Abstract / Description:We present a new mechanism for core-collapse supernova explosions that relies upon acoustic power generated in the inner core as the driver. In our simulation using an 11-solar-mass progenitor, a strong advective-acoustic oscillation à la Foglizzo with a period of 25–30 ms arises 200 ms after bounce. Its growth saturates due to the generation of secondary shocks, and kinks in the resulting shock structure funnel and regulate subsequent accretion onto the inner core. However, this instability is not the primary agent of explosion. Rather, it is the acoustic power generated in the inner turbulent region and most importantly by the excitation and sonic damping of core g-mode oscillations. An l = 1 mode with a period of 3 ms grows to be prominent around 500 ms after bounce. The accreting protoneutron star is a self-excited oscillator. The associated acoustic power seen in our 11-solar-mass simulation is sufficient to drive the explosion. The angular distribution of the emitted sound is fundamentally aspherical. The sound pulses radiated from the core steepen into shock waves that merge as they propagate into the outer mantle and deposit their energy and momentum with high efficiency. The core oscillation acts like a transducer to convert accretion energy into sound. An advantage of the acoustic mechanism is that acoustic power does not abate until accretion subsides, so that it is available as long as it may be needed to explode the star.
External Publication Status:published
Document Type:Conference-Paper
Communicated by:Bernhard F. Schutz
Affiliations:MPI für Gravitationsphysik/Astrophysical Relativity
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