Physics
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sgrb.confe..11b&link_type=abstract
Presented at the KITP Conference: Supernova and Gamma-Ray Burst Remnants, Feb 10, 2006, Kavli Institute for Theoretical Physics,
Physics
Scientific paper
We present a new mechanism for core-collapse supernova explosions thatrelies upon acoustic power generated in the inner core as thedriver. If, and in the circumstances in which, the neutrino mechanism doesnot obtain, this acoustic mechanism would come into its own. In oursimulations, a strong advective-acoustic oscillation a la Foglizzo with aperiod of ~25-30 milliseconds (ms) arises ~200 ms after bounce. Its growthsaturates due to the generation of secondary shocks, and kinks in theresulting shock structure funnel and regulate subsequent accretion onto theinner core. However, this instability is not the primary agent ofexplosion. Rather, it is the acoustic power generated in the innerturbulent region and most importantly by the excitation and sonic dampingof core g-mode oscillations. An l=1 mode with a period of ~3 ms grows tobe prominent around ~500 ms after bounce. The accreting protoneutron staris a self-excited oscillator. The associated acoustic power seen in our11-solar-mass simulation is sufficient to drive the explosion. The angulardistribution of the emitted sound is fundamentally aspherical, and theresulting blast is almost unipolar. The sound pulses radiated from the coresteepen into shock waves that merge as they propagate into the outer mantleand deposit their energy and momentum with high efficiency. The coreoscillation acts like a transducer to convert accretion energy intosound. An advantage of the acoustic mechanism is that acoustic power doesnot abate until accretion subsides, so that it is available as long as itmay be needed to explode the star, unless a black hole is formed. Theconsequences of this new mechanism for the explosion morphology, ther-process, pulsar kicks, and the systematics with progentior mass androtation will be explored.
No associations
LandOfFree
Recent Theoretical Results on Core-Collapse SNe does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Recent Theoretical Results on Core-Collapse SNe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recent Theoretical Results on Core-Collapse SNe will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1164796