1. Department of Physics & Astronomy, University of Victoria , 3800 Finnerty Road, Victoria, British Columbia V8P 5C2, Canada
2. Department of Physics & Astronomy, McMaster University , 1280 Main Street W, Hamilton, Ontario L8S 4K1, Canada
3. Dipartimento di Fisica e Astronomia ‘Augusto Righi,’ Università degli Studi di Bologna , Via Gobetti 93/2, Bologna I-40129, Italy
4. INAF – Osservatorio di Astrofisica e Scienze dello Spazio di Bologna , Via Gobetti 93/3, Bologna I-40129, Italy
5. Department of Physics & Astronomy, Trent University , 1600 West Bank Drive, Peterborough, Ontario K9L 0G2, Canada