SN 2021hpr: A Normal Type Ia Supernova Showing Excess Emission in the Early Rising Phase by Abdusamatjan Iskandar, Xiaofeng Wang, Ali Esamdin, Xiangyun Zeng, Craig Pellegrino, Shengyu Yan, Jialian Liu, Alexei V. Filippenko, D. Andrew Howell, Curtis McCully, Thomas G. Brink, Maokai Hu, Yi Yang, WeiKang Zheng, Guoliang Lü, Jujia Zhang, CuiYing Song, RuiFeng Huang, Rachael C. Amaro, Chunhai Bai, Kyle G. Dettman, Lluís Galbany, Daichi Hiramatsu, Bostroem K. Azalee, Koichi Itagaki, Saurabh W. Jha, Shuguo Ma, David J. Sand, Jennifer E. Andrews, Jacob Jencson, Peter Milne, Jeniveve Pearson, Manisha Shrestha, Nathan Smith, Réka Könyves-Tóth, Samuel Wyatt, Xuan Zhang, Shahidin Yaqup, Letian Wang, Mengfan Zhang

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