1. Carl Sagan Center for the Study of Life in the Universe, SETI Institute, 189 Bernardo Avenue, Mountain View, CA 94043, USA.
2. Hubble Fellow, Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.
3. Hubble Fellow, Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA.
4. NASA Ames Research Center, Moffett Field, CA 94035, USA.
5. Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
6. Department of Astronomy, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182–1221, USA.
7. Department of Astronomy and Astrophysics, Villanova University, 800 East Lancaster Avenue, Villanova, PA 19085, USA.
8. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA.
9. Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark.
10. Konkoly Observatory, Konkoly ut 15-17, Budapest, H-1121, Hungary.
11. Department of Astronomy, University of California, Berkeley, CA 94720, USA.
12. Department of Astronomy and Astrophysics, University of California, Santa Cruz, Santa Cruz, CA 95064, USA.
13. Las Cumbres Observatory Global Telescope Network, 6740 Cortona Drive, Suite 102, Santa Barbara, CA 93117, USA.
14. Department of Physics, Broida Hall, University of California, Santa Barbara, CA 93106, USA.
15. 211 Bryant Space Science Center, Gainesville, FL 32611–2055, USA.
16. Department of Physics, San Jose State University, San Jose, CA 95192, USA.
17. Orbital Sciences Corporation/NASA Ames Research Center, Moffett Field, CA 94035, USA.
18. Bay Area Environmental Research Institute/NASA Ames Research Center, Moffett Field, CA 94035, USA.
19. Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, DK-1350 Copenhagen, Denmark.
20. Fred Lawrence Whipple Observatory, Smithsonian Astrophysical Observatory, Amado, AZ 85645, USA.
21. Department of Mathematics, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182, USA.
22. Fermilab Center for Particle Astrophysics, Post Office Box 500, Batavia, IL 60510, USA.
23. Lowell Observatory, Flagstaff, AZ 86001, USA.
24. McDonald Observatory, University of Texas at Austin, Austin, TX 78712, USA.
25. Carnegie Institute of Washington, Washington, DC 20015, USA.
26. Eureka Scientific, 2452 Delmer Street, Suite 100, Oakland, CA 94602, USA.
27. Department of Astronomy, Yale University, New Haven, CT 06511, USA.