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

Li, WenxiongWenxiongLiWang, XiaofengXiaofengWangHu, MaokaiMaokaiHuYang, YiYiYangZhang, JujiaJujiaZhangMo, JunJunMoChen, ZhihaoZhihaoChenZhang, TianmengTianmengZhangBENETTI, StefanoStefanoBENETTICAPPELLARO, EnricoEnricoCAPPELLAROELIAS DE LA ROSA, NANCY DEL CARMENNANCY DEL CARMENELIAS DE LA ROSAIsern, JordiJordiIsernMorales-Garoffolo, AntoniaAntoniaMorales-GaroffoloHuang, FangFangHuangOCHNER, PAOLOPAOLOOCHNERPASTORELLO, AndreaAndreaPASTORELLOREGUITTI, ANDREAANDREAREGUITTITARTAGLIA, LEONARDOLEONARDOTARTAGLIATerreran, GiacomoGiacomoTerreranTOMASELLA, LinaLinaTOMASELLAWang, LifanLifanWang2021-01-042021-01-0420190004-637Xhttp://hdl.handle.net/20.500.12386/29467We 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.STAMPAenObservations of Type Ia Supernova 2014J for Nearly 900 Days and Constraints on Its Progenitor SystemArticle10.3847/1538-4357/ab2b492-s2.0-85072328274000483094200012https://iopscience.iop.org/article/10.3847/1538-4357/ab2b492019ApJ...882...30LFIS/05 - ASTRONOMIA E ASTROFISICA