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Type Ia supernovae (SNe) are believed to be caused by the thermonuclearexplosion of a white dwarf (WD), but the nature of the progenitor system(s) isstill unclear. Recent theoretical and observational developments have led torenewed interest in double degenerate models, in particular the "helium-ignitedviolent merger" or "dynamically-driven double-degenerate double-detonation"(D$^6$). In this paper we take the output of an existing D$^6$ SN model andcarry it into the supernova remnant (SNR) phase up to 4000 years after theexplosion, past the time when all the ejecta have been shocked. Assuming auniform ambient medium, we reveal specific signatures of the explosionmechanism and spatial variations intrinsic to the ejecta. The first detonationproduces an ejecta tail visible at early times, while the second detonationleaves a central density peak in the ejecta that is visible at late times. TheSNR shell is off-centre at all times, because of an initial velocity shift dueto binary motion. The companion WD produces a large conical shadow in theejecta, visible in projection as a dark patch surrounded by a bright ring. Thisis a clear and long-lasting feature that is localized, and its impact on theobserved morphology is dependent on the viewing angle of the SNR. These resultsoffer a new way to diagnose the explosion mechanism and progenitor system usingobservations of a Type Ia SNR.

The double detonation of a double degenerate system, from Type Ia supernova explosion to its supernova remnant