1. Battcock Centre for Experimental Astrophysics, Cavendish Laboratory, University of Cambridge , JJ Thomson Avenue, Cambridge CB3 0HE, UK
2. Astrobiology Research Unit, University of Liège , Allée du 6 août, 19, B-4000 Liège (Sart-Timan), Belgium
3. University of Bern, Center for Space and Habitability , Gesellschaftsstrasse 6, CH-3012 Bern, Switzerland
4. School of Physics and Astronomy, University of Birmingham , Edgbaston, Birmingham B15 2TT, UK
5. Department of Earth, Atmospheric and Planetary Sciences , MIT, 77 Massachusetts Avenue, Cambridge MA 02139, USA
6. Instituto de Astrofísica de Canarias (IAC) , Calle Vía Láctea s/n, E-38200 La Laguna, Tenerife, Spain
7. Space Sciences, Technologies and Astrophysics Research (STAR) Institute, University of Liège , Allée du 6 août, 19, B-4000 Liège (Sart-Timan), Belgium
8. Instituto de Astronomía, Universidad Nacional Autónoma de México , Ciudad Universitaria, Ciudad de México 04510, México
9. Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology , Cambridge MA 02139, USA
10. Department of Physics, University of Warwick , Coventry CV4 7AL, UK