Observations of Type Ia Supernova 2014J for Nearly 900 Days and Constraints on Its Progenitor System

Abstract

We present extensive ground-based and $HubbleSpaceTelescope$ ($HST$) photometry of the highly reddened, very nearby type Ia supernova (SN Ia) 2014J in M82, covering the phases from 9 days before to about 900 days after the $B$-band maximum. SN 2014J is similar to other normal SNe Ia near the maximum light, but it shows flux excess in the $B$ band in the early nebular phase. This excess flux emission can be due to light scattering by some structures of circumstellar materials located at a few 10${}^{17}$ cm, consistent with a single degenerate progenitor system or a double degenerate progenitor system with mass outflows in the final evolution or magnetically driven winds around the binary system. At t$\sim$+300 to $\sim$+500 days past the $B$-band maximum, the light curve of SN 2014J shows a faster decline relative to the ${}^{56}$Ni decay. Such a feature can be attributed to the significant weakening of the emission features around [Fe III] $\lambda$4700 and [Fe II] $\lambda$5200 rather than the positron escape as previously suggested. Analysis of the $HST$ images taken at t$>$600 days confirms that the luminosity of SN 2014J maintains a flat evolution at the very late phase. Fitting the late-time pseudo-bolometric light curve with radioactive decay of ${}^{56}$Ni, ${}^{57}$Ni and ${}^{55}$Fe isotopes, we obtain the mass ratio ${}^{57}$Ni/${}^{56}$Ni as $0.035\pm 0.011$, which is consistent with the corresponding value predicted from the 2D and 3D delayed-detonation models. Combined with early-time analysis, we propose that delayed-detonation through single degenerate scenario is most likely favored for SN 2014J.

arXiv comment28 pages, 12 figures. Accepted for publication in ApJ

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