Neutrino-driven explosions of ultra-stripped Type Ic supernovae generating binary neutron stars

Abstract

We study explosion characteristics of ultra-stripped supernovae (SNe), which\nare candidates of SNe generating binary neutron stars (NSs). As a first step,\nwe perform stellar evolutionary simulations of bare carbon-oxygen cores of mass\nfrom 1.45 to 2.0 $M_\\odot$ until the iron cores become unstable and start\ncollapsing. We then perform axisymmetric hydrodynamics simulations with\nspectral neutrino transport using these stellar evolution outcomes as initial\nconditions. All models exhibit successful explosions driven by neutrino\nheating. The diagnostic explosion energy, ejecta mass, Ni mass, and NS mass are\ntypically $\\sim 10^{50}$ erg, $\\sim 0.1 M_\\odot$, $\\sim 0.01M_\\odot$, and\n$\\approx 1.3 M_\\odot$, which are compatible with observations of\nrapidly-evolving and luminous transient such as SN 2005ek. We also find that\nthe ultra-stripped SN is a candidate for producing the secondary low-mass NS in\nthe observed compact binary NSs like PSR J0737-3039.\n