1. Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, UK
2. Centre for Exoplanets and Habitability, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL, UK
3. Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP , Rua das Estrelas, P-4150-762 Porto, Portugal
4. Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto , Rua do Campo Alegre, P-4169-007 Porto, Portugal
5. Center for Astrophysics | Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USA
6. Department of Astronomy, University of California Berkeley , Berkeley, CA 94720, USA
7. Department of Physics and Astronomy, University of Louisville , Louisville, KY 40292, USA
8. Department of Physics and Astronomy, Vanderbilt University , Nashville, TN 37235, USA
9. Department of Physics, Engineering, and Astronomy, Stephen F. Austin State University , 1936 North St, Nacogdoches, TX 75962, USA
10. Cerro Tololo Inter-American Observatory , Casilla 603, La Serena, Chile
11. American Association of Variable Star Observers , 185 Alewife Brook Parkway, Suite 410, Cambridge, MA 02138, USA
12. Observatoire Astronomique de l’Université de Genève , Chemin Pegasi 51b, CH-1290 Versoix, Switzerland
13. Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
14. NASA Ames Research Center , Moffett Field, CA 94035, USA
15. Department of Physics and Astronomy, Swarthmore College , Swarthmore, PA 19081, USA
16. Department of Physics and Astronomy, The University of North Carolina at Chapel Hill , Chapel Hill, NC 27599-3255, USA
17. Space Science and Astrobiology Division, NASA Ames Research Center , MS 245-3, Moffett Field, CA 94035, USA
18. European Southern Observatory , Karl-Schwarzschild-Straße 2, D-85748 Garching bei München, Germany
19. Physikalisches Institut, University of Bern , Gesellsschaftstrasse 6, CH-3012 Bern, Switzerland
20. Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
21. Department of Aeronautics and Astronautics, Massachusetts Institute of Technology , Cambridge, MA 02139, USA
22. Kotizarovci Observatory , Sarsoni 90, 51216 Viskovo, Croatia
23. Department of Astrophysical Sciences, Princeton University , Princeton, NJ 08544, USA