Quote:
Originally Posted by Agemegos
The problem is that a white dwarf is the low-luminosity remnant of a star that was once much more luminous¹ — a red giant or perhaps a supernova.
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I don't think white dwarfs can be supernova remnants. Also, note that the red giant will have affected planets orbiting other stars in the group if they're close by (the red giant was likely thousands of times brighter than the other stars, so if the planetary orbit was is more than a couple percent of the distance to the red giant, the red giant will have been providing more heat than the main star).