What structure remains at the center after a low-mass star gently expels its outer layers forming a planetary nebula?

Answer

A white dwarf

After a low-mass star exhausts core hydrogen and ejects its outer layers, the remaining hot, dense, carbon-oxygen core becomes a white dwarf.

What structure remains at the center after a low-mass star gently expels its outer layers forming a planetary nebula?
astronomystellarstarscycles