What is produced by a supernova explosion of a white dwarf?

Astronomers find a small white dwarf that could be the burned remains of a failed supernova explosion that kicked it out of the Milky Way. ... The reason these events' brightnesses are so reliable is because they are all created when a white dwarf steals too much material from a companion star. read more

A type Ia supernova (read "type one-a") is a type of supernova that occurs in binary systems (two stars orbiting one another) in which one of the stars is a white dwarf. The other star can be anything from a giant star to an even smaller white dwarf. read more

Type Ia supernovae are generally thought to originate from white dwarf stars in a close binary system. As the gas of the companion star accumulates onto the white dwarf, the white dwarf is progressively compressed, and eventually sets off a runaway nuclear reaction inside that eventually leads to a cataclysmic supernova outburst. read more