1. Institute of Astronomy, National Tsing Hua University , 101, Section 2. Kuang-Fu Road, Hsinchu, 30013, Taiwan, (R.O.C.)
2. Department of Physics, National Tsing Hua University , 101, Section 2. Kuang-Fu Road, Hsinchu, 30013, Taiwan, (R.O.C.)
3. Sabancı University, Faculty of Engineering and Natural Sciences , 34956, Istanbul, Turkey
4. Department of Physics, National Chung Hsing University , 145, Xingda Road, Taichung, 40227, Taiwan (R.O.C.)
5. Research School of Astronomy and Astrophysics, The Australian National University , Canberra, ACT 2611 , Australia
6. Center for Astrophysical Sciences, Department of Physics and Astronomy, The Johns Hopkins University , 3400 N Charles St. Baltimore, MD 21218 , USA