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A promising progenitor scenario for Type Ia supernovae (SNeIa) is thethermonuclear detonation of a white dwarf in a close binary system with anotherwhite dwarf. After the primary star explodes, the surviving donor can bespontaneously released as a hypervelocity runaway. One such runaway donorcandidate is LP 398-9, whose orbital trajectory traces back $\approx 10^5$years to a known supernova remnant. Here we report the discovery of carbon-richcircumstellar material around LP 398-9, revealed by a strong infrared excessand analyzed with follow-up spectroscopy. The circumstellar material is mostplausibly composed of inflated layers from the star itself, mechanically andradioactively heated by the past companion's supernova. We also detect a 15.4hr periodic signal in the UV and optical light curves of LP 398-9, which weinterpret as surface rotation. The rotation rate is consistent with theoreticalpredictions from this supernova mechanism, and the brightness variations couldoriginate from surface inhomogeneity deposited by the supernova itself. Ourobservations strengthen the case for this double-degenerate SNIa progenitorchannel, and motivate the search for more runaway SNIa donors.

The SNIa Runaway LP 398-9: Detection of Circumstellar Material and Surface Rotation