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Originally Posted by GWJ
2. Should white dwarf have any planets?
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Besides everything Agememos mentioned white dwarfs will trend towards being young stars. Sirius B is probably only 240 million years old and went off the Main sequence 120 million years ago after starting out as a B-class star of 5 Solar masses.
Big stars burn faster and stars that have burnt out have a certain likelihood of being formerly big stars.
You could have a white dwarf that used to be about the size of our Sun but it would have needed to have formed in the very early period of the Milky Way to have run through its' 10 billion year life span. Its' planets would be correspondgly old as well.
It would also probably have needed to be a third generation star (child of two previous supernovas) to have rocky planets in spite of the early age of its' formation. This might be possible as supernovas may have gone off like popcorn in the very earliest time periods.