What forms after a supernova if the core that remains has a mass of 1.4 to 3 solar masses?

If the core that remains after a supernova has a mass between 1.4 and 3 solar masses, it typically forms a neutron star. Neutron stars are incredibly dense objects composed predominantly of neutrons, resulting from the collapse of the core under gravity, which overcomes electron degeneracy pressure. These stars can exhibit rapid rotation and emit beams of radiation, often observed as pulsars.