1. Department of Physics & Astronomy, University of California , Irvine, 4129 Reines Hall, Irvine, CA 92697 , USA
2. Department of Astronomy, The University of Texas at Austin , Austin, TX 78712 USA
3. Space Telescope Science Institute , 3700 San Martin Dr, Baltimore, MD 21218 , USA
4. Centro de Astrobiología (CAB), CSIC-INTA , Ctra. de Ajalvir km 4, Torrejón de Ardoz, E-28850 Madrid , Spain
5. Physics & Astronomy Department, University of Louisville , Louisville, KY 40292 USA
6. School of Physics and Astronomy, Rochester Institute of Technology , 84 Lomb Memorial Drive, Rochester, NY 14623 , USA
7. Instituto de Investigación Multidisciplinar en Ciencia y Tecnología, Universidad de La Serena , Raul Bitrán 1305, La Serena 2204000 , Chile
8. Astrophysics Science Division, NASA Goddard Space Flight Center , 8800 Greenbelt Rd, Greenbelt, MD 20771 , USA