White dwarfs typically have a radius just ... burning the last of its hydrogen and causing the star's outer layers to expand outward. At this stage, the star becomes a large red giant.

The other subject is Kepler-62, a "main sequence" star at a similar phase ... stellar energy distribution. "While white dwarf stars may still give off some heat from residual nuclear activity in their ...

They found that a planet orbiting a white dwarf star would offer a warmer climate ... heat from residual nuclear activity in their outer layers, they no longer exhibit nuclear fusion at their ...