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A helium-burning white dwarf binary as a supersoft X-ray source

Burgess, J. M.; Werner, K.; Haberl, F. +12 more

Type Ia supernovae are cosmic distance indicators^1,2, and the main source of iron in the Universe^3,4, but their formation paths are still debated. Several dozen supersoft X-ray sources, in which a white dwarf accretes hydrogen-rich matter from a non-degenerate donor star, have been observed⁵ and suggested as Type I…