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The Developing Story of Core Collapse Supernovae

Presentation #405.01 in the session Distinguished Career Lecture: Roger Chevalier (University of Virginia).

Published onMay 03, 2024
The Developing Story of Core Collapse Supernovae

In the 1970s modeling the optical properties of supernovae showed the most common supernovae (Type IIP SNe) involved the sudden deposition of energy (~1051 ergs) at the center of a red supergiant (RSG) star. In the 1980s, progenitor RSGs were directly observed. Radio and X-ray observations showed the presence of hot gas and relativistic particles in the shocked region bordered by SN ejecta and the progenitor wind. The wind density was inferred to be comparable of that around RSGs. Altogether, the observations indicated a straightforward explosion and wind interaction. However, increasing accuracy of observations and models showed a significant fraction of the supernovae deviate from the expected structure in the region out to ~1015 cm. A promising reason for the deviation is the presence of a binary companion star that affects the stellar evolution. A companion can also lead to a complex circumstellar medium, as observed in some cases. Finally, compact objects are expected to be present near the centers of these supernovae but have been elusive.

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