A type Ia supernova at the heart of superluminous transient SN 2006gy

Abstract

Superluminous supernovae radiate up to 100 times more energy than normal supernovae. The origin of this energy and the nature of their stellar progenitors are poorly understood. We identify neutral iron lines in the spectrum of one such transient, SN 2006gy, and show that they require a large mass of iron ( 0.3 M ⊙ ) expanding at 1500 km s −1 . We demonstrate that a model of a standard Type Ia super-

The CO White Dwarf + Intermediate Mass/Massive Star Binary Evolution: Possible Merger Origins for Peculiar Type Ia and II Supernovae

“…The mergers with HG stars are much more common than mergers with CHeB stage stars. With a standard BPS simulation, we have shown that the created CSM (Figure 4) and the rate (Table 3) of CMD SN explosions in CO WD + massive star systems can be compatible with the observational constraints of SN 2006gy (Jerkstrand et al 2020) and rate of type II SLSNe.…”

“…They suggested one evolution pathway proposed by Sabach & Soker (2014) which is that a merger of a CO WD with the core of a red supergiant (RSG) star inside the heavy CE may generate an SN like SN 2006gy (Jerkstrand et al 2020). Following the idea of Sparks & Stecher (1974;Sabach & Soker 2014) and results of Jerkstrand et al (2020), we will study the possible progenitor model for SN 2006gy-like SLSNe with different binary physics by considering several important evolution models.…”

“…Sabach & Soker (2014 pointed out that the CE mergerinduced events may be the origins of SNe-like transients. Recently, Jerkstrand et al (2020) presented their observational and theoretical results for a type II SLSN named SN 2006gy (e.g., Smith et al 2007;Ofek et al 2007;Agnoletto et al 2009), and demonstrated that the observed signature in the late-time nebular spectrum and light curve of this transient can be reproduced by the iron-rich SN Ia ejecta and its interaction with a massive (∼ 10M ) CSM. They suggested one evolution pathway proposed by Sabach & Soker (2014) which is that a merger of a CO WD with the core of a red supergiant (RSG) star inside the heavy CE may generate an SN like SN 2006gy (Jerkstrand et al 2020).…”

“…Recently, Jerkstrand et al (2020) presented their observational and theoretical results for a type II SLSN named SN 2006gy (e.g., Smith et al 2007;Ofek et al 2007;Agnoletto et al 2009), and demonstrated that the observed signature in the late-time nebular spectrum and light curve of this transient can be reproduced by the iron-rich SN Ia ejecta and its interaction with a massive (∼ 10M ) CSM. They suggested one evolution pathway proposed by Sabach & Soker (2014) which is that a merger of a CO WD with the core of a red supergiant (RSG) star inside the heavy CE may generate an SN like SN 2006gy (Jerkstrand et al 2020). Following the idea of Sparks & Stecher (1974;Sabach & Soker 2014) and results of Jerkstrand et al (2020), we will study the possible progenitor model for SN 2006gy-like SLSNe with different binary physics by considering several important evolution models.…”

The Palomar Transient Factory Core-collapse Supernova Host-galaxy Sample. I. Host-galaxy Distribution Functions and Environment Dependence of Core-collapse Supernovae

“…77 We use the classifications from G. Leloudas et al (2021, in preparation) and added other luminous SNe IIn to this class. The origin of this class and its relationship to regular SNe IIn is highly debated (Gal-Yam 2012; Moriya et al 2019;Gal-Yam 2019;Jerkstrand et al 2020;Nicholl et al 2020). 78 Arcavi et al (2010); and tidal disruption events (TDEs) by Arcavi et al (2014).…”