simplicimus: Silly Questions: Don't white stars have a considerable gravity pull? Would't the planets be tidally locked?
Ed Grubermann: A planet in orbit around a white dwarf is would have to be incredibly close to the star in order to get any heat from it. Close enough that it would have been blown to bits when the star went super-nova. Possibly so close that it would have had to have been inside the original start before it exploded.
dragonchild: Any planets in the Goldilocks zone before its expansion & collapse would be roasted clean, yes, but a lot can happen in several billion years -- the star could capture another planet, an outer planet could spiral inwards, or an inner (sterilized) planet can gradually accumulate water & an atmosphere from comet impact debris. To me, the biggest obstacle is that the white dwarf's temperature doesn't really stabilize on a "life needs time to evolve" timescale until it gets relatively cool. These things start out hotter than white-hot (emitting x-rays and UV) and over the course of several billion years will cool to surface temperatures lower than that of the Sun today. That makes the Goldilocks zone enough of a moving target to pose problems for life. An ideal candidate planet would orbit close to a cool white dwarf, but that means it starts out getting blasted by X-rays and UV.
JasonOfOrillia: You can migrate to a dying star system if you want, Subby, but I'm going for a little more upside potential with a young system.
simplicimus: Would't the planets be tidally locked?
Darth_Lukecash: Huh, I thought a white dwarf wouldn't have any planets close enough, especially if it expanded.
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