1. Carl Sagan Center for the Study of Life in the Universe, SETI Institute, Mountain View, CA 94043, USA.
2. Department of Astronomy, Cornell University, Ithaca, NY 14853, USA.
3. NASA Ames Research Center, Moffett Field, CA 94035, USA.
4. NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA.
5. Astronomy Unit, Queen Mary University of London, London E1 4NS, UK.
6. Department of Physics, University of Idaho, Moscow, ID 83844, USA.
7. Department of Physics, University of Central Florida, Orlando, FL 32816, USA.
8. College of Engineering, Cornell University, Ithaca, NY 14853, USA.
9. Planetary Science Institute, Tucson, AZ 85719, USA.
10. Department of Earth, Planetary, and Space Sciences, University of California at Los Angeles, Los Angeles, CA 90095, USA.
11. Institut de Physique du Globe de Paris, Centre National de la Recherche Scientifique (CNRS)–Unité Mixte de Recherche (UMR) 7154, Université Paris-Diderot, Université Sorbonne-Paris-Cité (USPC), Paris, France.
12. INAF-IAPS (Istituto Nazionale di AstroFisica-Istituto di Astrofisica e Planetologia Spaziali), Rome, Italy.
13. Laboratoire de Planetologie et Geodynamique, CNRS-UMR 6112, Université de Nantes, 44322 Nantes, France.
14. Physics Department, Lancaster University, Lancaster LA1 4YB, UK.
15. Space Science Institute, Boulder, CO 80301, USA.