1. Department of Astrophysics and Planetary Science, Villanova University, 800 East Lancaster Avenue, Villanova, PA 19085, USA
2. Kavli Institute for Theoretical Physics, Kohn Hall, University of California, Santa Barbara, CA 93106, USA
3. TAPIR, Walter Burke Institute for Theoretical Physics, Mailcode 350-17 California Institute of Technology, Pasadena, CA 91125, USA
4. SETI Institute/NASA Ames Research Center, Moffett Field, CA 94035, USA
5. Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK
6. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA
7. Astronomy Department, University of California, Berkeley, CA 94720, USA
8. California Institute of Technology, Pasadena, CA 91125, USA
9. Department of Astronomy and McDonald Observatory, University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USA
10. School of Physics, Sydney Institute for Astronomy (SIfA), The University of Sydney, Sydney, NSW 2006, Australia
11. Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark