We calculate the structure and neutron content of neutrino-heated magnetohydrodynamic winds driven from the surface of newly-formed magnetars (“proto-magnetars”) and from the midplane of hyper-accreting disks, two of the possible central engines for gamma-ray bursts (GRBs) and hyper-energetic supernovae (SNe). Both the surface of proto-magnetars and the midplane of neutrino-cooled accretion flo...

Abstract Magnetars, neutron stars thought to be with ultrastrong magnetic fields of 10 14–15 G, are observed much hotter than ordinary pulsars ∼10 12 and additional heating sources required. One possibility is by the ambipolar diffusion in stellar core. This scenario examined calculating models using relativistic thermal evolutionary code without making isothermal approximation. The results sho...

The origin of ultra-intense magnetic fields on magnetars is a mystery in modern astrophysics. We model the core collapse dynamics of massive progenitor stars with high surface magnetic fields in the theoretical framework of a self-similar general polytropic magnetofluid under the self-gravity with a quasi-spherical symmetry. With the specification of physical parameters such as mass density, te...