1. Astronomy Department, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182, USA.
2. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.
3. Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA.
4. McDonald Observatory, The University of Texas at Austin, Austin, TX 78712–0259, USA.
5. Astronomy Department, University of Florida, 211 Bryant Space Sciences Center, Gainesville, FL 32611, USA.
6. Institute for Astronomy and NASA Astrobiology Institute University of Hawaii-Manoa, 2680 Woodlawn Drive, Honolulu, HI 96822, USA.
7. School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978, Israel.
8. Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
9. Department of Astronomy, BOX 351580, University of Washington, Seattle, WA 98195, USA.
10. Niels Bohr Institute, University of Copenhagen, Juliane Maries vej 30, 2100 Copenhagen, Denmark.
11. Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, Ø ster Voldgade 5-7, 1350 Copenhagen, Denmark.
12. SETI Institute, 189 Bernardo Avenue, Mountain View, CA 94043, USA.
13. Astronomy Department, University of California, Berkeley, CA 94720, USA.
14. NASA Ames Research Center, Moffett Field, CA 94035, USA.
15. Las Cumbres Observatory Global Telescope Network, 6740 Cortona Drive, Suite 102, Santa Barbara, CA 93117, USA.
16. Department of Physics, Broida Hall, University of California, Santa Barbara, CA 93106, USA.
17. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.
18. Bay Area Environmental Research Institute, Inc., 560 Third Street West, Sonoma, CA 95476, USA.
19. Department of Terrestrial Magnetism, Carnegie Institution for Science, 5241 Broad Branch Road NW, Washington, DC 20015–1305, USA.
20. Orbital Sciences Corporation, 45101 Warp Drive, Dulles, VA 20166, USA.