April 10th, 2015. Maurice Van Putten (Sejong Univ.)

Post date: Apr 9, 2015 2:12:21 AM

*Speaker: Prof. Maurice Van Putten (Sejong Univ.)

*Time: 4:00 PM, April 10th (Fri.)

*Location: Seminar room, 2nd floor of Samsung Library

*Title: "Searches for long gravitational wave bursts from energetic core-collapse supernovae"

*Abstract: GRBs and core-collapse supernovae (CC-SNe) are probably powered by neutron stars or black holes. These energetic and catastrophic events may be strong sources of gravitational waves, that may be detectable by upcoming gravitational wave experiments. SN 1987A is prototypical, whose MeV neutrino burst established neutronization at high density, probably from a (proto-)neutron star. Further core collapse would have produced a rotating black hole, given the aspherical remnant of SN1987A. Data from GRB observatories like BATSE, BeppoSAX and Swift suggest that rotating black holes can account for hyper-energetic events GRB 031203/SN2003lw and 030329/SN2003dh, short GRBs with Extended Emission and long GRBs with and without SNe such as GRB 060614. We review various mechanisms for gravitational radiation from hyper-accretion onto rotating black holes by non-axisymmetric distributions of matter. Maximal luminosity is expected from the inner most regions of the accretion flow, down to the Innermost Stable Circular Orbit (ISCO), evolving along with the Kerr space-time induced by the black hole during the accretion episode. The gravitational wave burst is likely accompanied by emission of MeV neutrinos and magnetic winds. This observational and theoretical picture justies searches for long duration gravitational wave bursts in Type Ib/c supernovae, that may appear as broadband bumps in spectra of the gravitational strain output of LIGO-Virgo and KAGRA. Using a recently developed chirp search method, we expect an essentially maximal sensitivity distance of about 100 Mpc.