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Here we present three-dimensional high resolution simulations of Type Iasupernova in the presence of a non-degenerate companion. We find that thepresence of a nearby companion leaves a long-lived hole in the supernovaejecta. In particular, we aim to study the long term evolution of this hole asthe supernova ejecta interacts with the surrounding interstellar medium. Usingestimates for the x-ray emission, we find that the hole generated by thecompanion remains for many centuries after the interaction between the ejectaand the interstellar medium. We also show that the hole is discernible over awide range of viewing angles and companion masses.

Shadows of our Former Companions: How the Single-Degenerate Binary Type Ia Supernova Scenario Affects Remnants