BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-4200
DTSTART:20160726T190000Z
DTEND:20160726T200000Z
DTSTAMP:20260419T075604Z
LAST-MODIFIED:20160719T130510Z
LOCATION:4274 Chamberlin Hall
SUMMARY:Neutrino Signal of Collapse-Induced Thermonuclear Supernovae: 
 The Case for Prompt Black Hole Formation in SN1987A\, NPAC (Nuclear/Pa
 rticle/Astro/Cosmo) Forum\, Kfir Blum\, Weizmann Institute
DESCRIPTION:Collapse-induced thermonuclear explosion (CITE) may explai
 n core-collapse supernovae (CCSNe). We analyze the neutrino signal in 
 CITE and compare it to the neutrino burst of SN1987A. For strong CCSNe
 \, as SN1987A\, CITE predicts a proto-neutron star (PNS) accretion pha
 se lasting up to a few seconds that is cut-off by black hole (BH) form
 ation. The neutrino luminosity can later be revived by accretion disc 
 emission after a dead time of few to few ten seconds. In contrast\, th
 e neutrino mechanism for CCSNe predicts a short (< 1sec) PNS accretion
  phase followed by slowly declining PNS cooling luminosity. We repeat 
 statistical analyses used in the literature to interpret the neutrino 
 mechanism\, and apply them to CITE. The first 1-2 sec of the neutrino 
 burst are equally compatible with CITE and with the neutrino mechanism
 . However\, the data hints towards a luminosity drop at t~2-3 sec\, in
  some tension with the neutrino mechanism but naturally attributed to 
 BH formation in CITE. The occurrence of neutrino signal events at 5 se
 c suggests that\, within CITE\, accretion disc formed by that time. We
  perform 2D numerical simulations\, showing that CITE may be able to a
 ccommodate this disc formation time while reproducing the ejected Ni56
  mass and ejecta kinetic energy within factors 2-3 of observations. We
  estimate the accretion disc neutrino luminosity\, finding it on the l
 ow side but compatible with data to a factor of 10. Given current unce
 rtainties in disc simulations we conclude that direct BH formation may
  have occurred in SN1987A.<br><br>
\n
URL:https://www.physics.wisc.edu/events/?id=4200
END:VEVENT
END:VCALENDAR