SN 1181 has no surviving He-star or luminous hydrogen-rich companion down to M_g > 8 mag within 0.3 pc, ruling out the single-degenerate channel for this faint Type Iax supernova and pointing to a white-dwarf merger.
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No Surviving Companion to the Galactic SN 1181: Evidence for a Double-Degenerate Channel for Type Iax Supernovae
SN 1181 has no surviving He-star or luminous hydrogen-rich companion down to M_g > 8 mag within 0.3 pc, ruling out the single-degenerate channel for this faint Type Iax supernova and pointing to a white-dwarf merger.