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

• Published in: The Astrophysical journal 2019-09, Vol.882 (1), p.30
• Main Authors: Li, Wenxiong, Wang, Xiaofeng, Hu, Maokai, Yang, Yi, Zhang, Jujia, Mo, Jun, Chen, Zhihao, Zhang, Tianmeng, Benetti, Stefano, Cappellaro, Enrico, Elias-Rosa, Nancy, Isern, Jordi, Morales-Garoffolo, Antonia, Huang, Fang, Ochner, Paolo, Pastorello, Andrea, Reguitti, Andrea, Tartaglia, Leonardo, Terreran, Giacomo, Tomasella, Lina, Wang, Lifan
• Format: Article
• Language: English
• Subjects: Astrophysics; Detonation; Emission; Evolution; Hubble Space Telescope; Iron; Isotopes; Light curve; Light scattering; Luminosity; Radioactive decay; Space telescopes; Stellar system evolution; Supernova; supernovae: general; supernovae: individual (SN 2014J); Three dimensional models; Two dimensional models
• ISSN: 0004-637X; 1538-4357; 1538-4357
• DOI: 10.3847/1538-4357/ab2b49

We present extensive ground-based and Hubble Space Telescope (HST) photometry of the highly reddened, very nearby 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 1017 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 ∼ +300 to ∼+500 days past the B-band maximum, the light curve of SN 2014J shows a faster decline relative to the 56Ni decay. That feature can be attributed to the significant weakening of the emission features around [Fe iii] λ4700 and [Fe ii] λ5200 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 pseudobolometric light curve with radioactive decay of 56Ni, 57Ni, and 55Fe isotopes, we obtain the mass ratio 57Ni/56Ni as 0.035 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 the single-degenerate scenario is most likely favored for SN 2014J.