Scientists have concluded that while it's possible that white dwarf stars and brown dwarf failed stars could host life-bearing planets since they do radiate heat, it's extremely unlikely. The heat they give off is feeble, declines over time, and could be in the form of lethal radiation at times. There are also gravitational tide issues since the planet would need to be so close to the dwarf.
While such systems may not be the place to look for native life, they might serve as outposts for any star-hopping civilizations that might be out and about.
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