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Mazzali, Qian Zhai, Tianmeng Zhang, Weimin Yi, Xiangcun Meng, Xiangming Zheng, Xiaofeng Wang, Xiliang Zhang, Xueli Wang, Xulin Zhao, Yufeng Fan, Yuxin Xin, Zhengweei Liu","submitted_at":"2015-12-13T03:17:28Z","abstract_excerpt":"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 $M_{B}=-19.84 \\pm 0.40\\,\\rm{mag}$, with a post-maximum decline rate $\\Delta$m$_{15}$(B) = 0.92 $\\pm$ 0.03\\,$\\rm{mag}$. From the maximum-light bolometric luminosity, $L=(2.30 \\pm 0.90) \\times 10^{43}\\,\\rm{erg\\,s^{-1}}$, we estimate the mass of synthesized \\Nifs\\ in SN 2011hr to be $M(\\rm{^{56}Ni})=1.11 \\pm 0.43\\,M_{\\sun}$. 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