X-ray Limits on the Progenitor System of the Type Ia Supernova 2017ejb

Abstract

We present deep X-ray limits on the presence of a pre-explosion counterpart to the low-luminosity Type Ia supernova (SN Ia) 2017ejb. SN 2017ejb was discovered in NGC 4696, a well-studied elliptical galaxy in the Centaurus cluster with 894 ks of Chandra imaging between 14 and 3 years before SN 2017ejb was discovered. Using post-explosion photometry and spectroscopy of SN 2017ejb, we demonstrate that SN 2017ejb is most consistent with low-luminosity SNe Ia such as SN 1986G and SN 1991bg. Analyzing the location of SN 2017ejb in pre-explosion images, we do not detect a pre-explosion X-ray source. We use these data to place upper limits on the presence of any unobscured supersoft X-ray source (SSS). SSS systems are known to consist of white dwarfs accreting from a non-degenerate companion star. We rule out any source similar to known SSS systems with $k{T}_{\mathrm{eff}}>85$ eV and $L_{\mathrm{bol}}>4\times 10^{38}{\text{erg s}}^{-1}$ as well as models of stably-accreting Chandrasekhar-mass WDs with accretion rates $\dot{M}>3\times 10^{-8}{M}_{\odot }{\text{yr}}^{-1}$. These findings suggest that low-luminosity SNe Ia similar to SN 2017ejb explode from WDs that are low-mass, have low pre-explosion accretion rates, or accrete very soon before explosion. Based on the limits from SN 2017ejb and other nearby SNe Ia, we infer that $<$47% of SNe Ia explode in stably-accreting Chandrasekhar-mass SSS systems.

arXiv comment10 pages, 4 figures, submitted to MNRAS

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