1. Physics & Astronomy, University of Kentucky, Lexington, Kentucky, USA
2. Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy.
3. Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, 85748 Garching, Germany.
4. Center for Astrophysics | Harvard & Smithsonian, Cambridge, MA, USA.
5. Physics & Astronomy, University of Kentucky, Lexington, Kentucky, USA.
6. 1. Physics & Astronomy, University of Kentucky, Lexington, Kentucky, USA. 2. Now at Physics & Astronomy, University of North Georgia, Dahlonega, Georgia, USA
7. Arts & Sciences Hive, University of Kentucky, Lexington, Kentucky, USA.
8. Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 70 Vassar St, Cambridge, MA, USA.
9. Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Mumbai 400005, India.
10. Royal Observatory of Belgium, Ringlaan 3, 1180 Brussels, Belgium