1. Physics Department and Tsinghua Center for Astrophysics, Tsinghua University, Beijing 100084, China
2. CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei 230026, China
3. School of Astronomy and Space Sciences, University of Science and Technology of China, Hefei 230026, China
4. Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
5. Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China
6. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China
7. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China
8. Department of Astronomy, University of California, Berkeley, CA 94720-3411, USA
9. International Centre of Supernovae, Yunnan Key Laboratory, Kunming 650216, China
10. CAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China
11. Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100101, China
12. Department of Astronomy, Xiamen University, Xiamen 361005, China
13. Department of Astronomy, Beijing Normal University, Beijing 100875, China