Stellar core-merger-induced collapse: new formation pathways for black holes, Thorne–Żytkow objects, magnetars, and superluminous supernovae

ABSTRACT Most neutron stars (NSs) and black holes (BHs) are believed to be the final remnants in evolution of massive stars. In this study, we propose a new formation channel for BHs peculiar NSs [specifically, magnetars Thorne–Żytkow objects (T$\dot{\rm Z}$Os)], which refer as core-merger-induced collapse (CMIC) model. This model involves merger during common-envelope phase an oxygen/neon/magnesium composition white dwarf core hydrogen-rich or helium-rich non-degenerate star, leading creation types objects. The results binary population synthesis simulations show that CMIC could make important contributions populations (millisecond) pulsars, T$\dot{\rm Z}$Os, magnetars, BHs. possibility superluminous supernovae powered by formed through is also being investigated. Magnetars with immediate matter surroundings after might good sources fast radio bursts.