PoS - Proceedings of Science
Volume 315 - The Golden Age of Cataclysmic Variables and Related Objects IV (GOLDEN 2017) - Classical Novae, Recurrent Novae and Nova-Like Stars
Circumstellar Environment around Type Ia Supernovae of Different Subtypes
K. Maeda
Full text: pdf
Pre-published on: May 20, 2018
Published on: September 13, 2018
In this paper, we argue that deriving the nature of circumstellar media (CSM) around type Ia supernovae (SNe Ia) is key to understanding their progenitor system(s). The issue is still controversial for normal SNe Ia, while there is robust evidence of dense CSM for a few classes of SN Ia `outliers'. We discuss the nature of CSM and the inferred progenitor systems for the candidate super-Chandrasekhar SNe Ia (SC-SNe Ia; SNe Ia originally characterized by large luminosity) and for the so-called SNe Ia-CSM (SNe Ia showing signatures of a strong ejecta-CSM interaction). The nature of CSM around SC-SN Ia 2012dn seems largely consistent with the expectation from an extreme case of the single degenerate scenario. The CSM around SNe Ia-CSM requires a very intensive mass loss rate, which may indicate that an Asymptotic Giant Branch (AGB) star would be involved in their progenitor systems. The link between SN Ia-CSM and SN 1991T-like objects is intriguing, and there is a possibility that they would arise from the same progenitor system while the difference is due to a variance in the progenitor configuration.
DOI: https://doi.org/10.22323/1.315.0055
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