Institute of Astronomy

Late Core-collapse Supernovae from Intermediate Mass Binaries

SpeakerTalk DateTalk Series
Emmanouil Zapartas29 July 2016Binary Stars Talks

Abstract

Core-collapse supernovae (ccSNe) mark the end of the lives of massive stars. The majority of these massive stars experience interaction with a binary companion before they explode, drastically affecting the evolution of both stars. We use a population synthesis approach to study the impact of binarity on the delay-time distribution of ccSNe, i.e. the supernova rate versus time after a sudden starburst.

We find that 10-30% of all ccSNe are “late”, i.e. they occur 50-200 Myrs after birth, when all single stars have already died. These late ccSNe originate from intermediate mass stars that gained mass from a binary companion. We investigate the main binary evolutionary channels, which include also exotic mergers, and discuss possible observational signatures of these late events. We also find up to 40% more ccSNe in a realistic population with massive binary stars compared to a pure single star population of the same total mass.

We conclude that the large majority of ccSNe originate from stars that have experienced binary interaction in the past, severely altering their properties. Our results will be relevant for future comparison with the results from all-sky automated transient surveys and as improved input models for stellar feedback in cosmological and galaxy evolution simulations.

Presentation