Nebular spectra and abundance tomography of the Type Ia supernova SN 2011fe: A normal SN Ia with a stable Fe core

P. A. Mazzali, M. Sullivan, A. V. Filippenko, P. M. Garnavich, K. I. Clubb, K. Maguire, Y. C. Pan, B. Shappee, J. M. Silverman, S. Benetti, S. Hachinger, K. Nomoto, E. Pian

研究成果: 雜誌貢獻期刊論文同行評審

54 引文 斯高帕斯(Scopus)


A series of optical and one near-infrared nebular spectra covering the first year of the Type Ia supernova SN 2011fe are presented and modelled. The density profile that proved best for the early optical/ultraviolet spectra, 'ρ-11fe', was extended to lower velocities to include the regions that emit at nebular epochs.Model ρ-11fe is intermediate between the fast deflagration modelW7and a low-energy delayed-detonation. Good fits to the nebular spectra are obtained if the innermost ejecta are dominated by neutron-rich, stable Fe-group species, which contribute to cooling but not to heating. The correct thermal balance can thus be reached for the strongest [Fe II] and [Fe III] lines to be reproduced with the observed ratio. The 56Ni mass thus obtained is 0.47 ± 0.05M⊙. The bulk of 56Ni has an outermost velocity of 8500 km s-1. Themass of stable iron is 0.23±0.03M⊙. Stable Ni has low abundance,10-2M⊙. This is sufficient to reproduce an observed emission line near 7400 Å. A sub-Chandrasekhar explosion model with mass 1.02M⊙ and no central stable Fe does not reproduce the observed line ratios. A mock model where neutron-rich Fe-group species are located above 56Ni following recent suggestions is also shown to yield spectra that are less compatible with the observations. The densities and abundances in the inner layers obtained from the nebular analysis, combined with those of the outer layers previously obtained, are used to compute a synthetic bolometric light curve, which compares favourably with the light curve of SN 2011fe.

頁(從 - 到)2631-2643
期刊Monthly Notices of the Royal Astronomical Society
出版狀態已出版 - 1 7月 2015


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