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Type: Journal article
Title: A luminous peculiar Type Ia supernova SN 2011hr: more like SN 1991T or SN 2007if?
Author: Zhang, J.J.
Wang, X.F.
Sasdelli, M.
Zhang, T.M.
Liu, Z.W.
Mazzali, P.A.
Meng, X.C.
Maeda, K.
Chen, J.C.
Huang, F.
Zhao, X.L.
Zhang, K.C.
Zhai, Q.
Pian, E.
Wang, B.
Chang, L.
Yi, W.M.
Wang, C.J.
Wang, X.L.
Xin, Y.X.
et al.
Citation: The Astrophysical Journal: an international review of astronomy and astronomical physics, 2016; 817(2):114-1-114-13
Publisher: IOP Publishing
Issue Date: 2016
ISSN: 0004-637X
Statement of
Ju-Jia Zhang, Xiao-Feng Wang, Michele Sasdelli, Tian-Meng Zhang, Zheng-Wei Liu, Paolo A. Mazzali ... et al.
Abstract: Photometric and spectroscopic observations of a slowly declining, luminous Type Ia supernova (SN Ia) SN 2011hr in the starburst galaxy NGC 2691 are presented. SN 2011hr is found to peak at ${M}_{B}\;=\;-19.84\pm 0.40\;\mathrm{mag}$, with a postmaximum decline rate Δm15(B) = 0.92 ± 0.03 mag. From the maximum-light bolometric luminosity, $L\;=\;(2.30\pm 0.90)\times {10}^{43}\;\mathrm{erg}\;{{\rm{s}}}^{-1}$, we estimate the mass of synthesized 56Ni in SN 2011hr to be $M{(}^{56}\mathrm{Ni})\;=\;1.11\pm 0.43\;{M}_{\odot }$. SN 2011hr appears more luminous than SN 1991T at around maximum light, and the absorption features from its intermediate-mass elements (IMEs) are noticeably weaker than those of the latter at similar phases. Spectral modeling suggests that SN 2011hr has IMEs of ~0.07 ${M}_{\odot }$ in the outer ejecta, which is much lower than the typical value of normal SNe Ia (i.e., 0.3–0.4 ${M}_{\odot }$) and is also lower than the value of SN 1991T (i.e., ~0.18 ${M}_{\odot }$). These results indicate that SN 2011hr may arise from a Chandrasekhar-mass white dwarf progenitor that experienced a more efficient burning process in the explosion. Nevertheless, it is still possible that SN 2011hr may serve as a transitional object connecting the SN 1991T-like SNe Ia with a superluminous subclass like SN 2007if given that the latter also shows very weak IMEs at all phases.
Keywords: galaxies: individual (NGC 2691) – supernovae: general – supernovae: individual (SN 2011hr, SN 1991T, SN 2007if)
Rights: © 2016. The American Astronomical Society. All rights reserved.
DOI: 10.3847/0004-637X/817/2/114
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