What is left behind after a star with one or more solar masses has died?

After a star with one or more solar masses has died, it typically leaves behind a white dwarf. This remnant consists mainly of carbon and oxygen and is the remaining core of the star that underwent a supernova explosion. In some cases, if the original star was massive enough, it may collapse into a neutron star or a black hole instead, depending on its mass and the specifics of its death.