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Explore the theoretical and observational aspects of Type Ia supernovae through this astrophysics colloquium lecture that examines the binary star explosion mechanism and its detectable signatures. Learn how Type Ia supernovae likely originate from binary systems where mass transfer from a companion star triggers sudden detonation, resulting in the companion being ejected at speeds exceeding 1000 kilometers per second due to extremely short orbital periods of 5-10 minutes. Discover how recent observations of these fast-moving surviving companion stars have motivated new theoretical investigations into the interaction between expanding explosive material and companion stars. Examine cutting-edge 3D numerical computations that reveal how stellar interactions brighten supernovae during the first day after explosion and create persistent wakes in the expanding ejecta. Understand how these wakes can be detected through late-time nebular emission observations and may continue to influence supernova remnant structure for hundreds of years, providing crucial insights into the binary nature of these cosmic explosions.
