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I know that SN 1604 is a Type Ia supernova. But was it formed from two white dwarfs colliding in a double degenerate scenario, or in a single white dwarf accreting matter? I have seen supporters of both theories.

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    $\begingroup$ can you show and link where you have seen support for either hypothesis? $\endgroup$
    – planetmaker
    Commented Oct 18 at 19:20
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    $\begingroup$ Note that double-degenerate also results from a white-dwarf accreting matter-- it's just accreting from a white-dwarf companion. It's unlikely to be an actual collision. $\endgroup$
    – antlersoft
    Commented Oct 18 at 23:45
  • $\begingroup$ As posed, this question would appear to be seeking an opinion. $\endgroup$
    – ProfRob
    Commented Oct 19 at 19:23
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    $\begingroup$ There is no consensus on this issue for any of the Type Ia supernovae. $\endgroup$
    – eshaya
    Commented Oct 25 at 13:04

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