1. School of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
2. Departamento de Astronomía, Universidad de Chile, Camino el Observatorio 1515, Las Condes, Casilla 36-D, 7591245, Santiago, Chile
3. Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, D-12489 Berlin, Germany
4. Geneva Observatory, University of Geneva, Chemin des Mailettes 51, CH-1290 Versoix, Switzerland
5. Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
6. Astronomy Unit, Queen Mary University of London, Mile End Road, London E1 4NS, UK
7. Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK
8. Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
9. Centro de Astrofísica y Tecnologías Afines (CATA), Casilla 36-D, 7591245, Santiago, Chile
10. Instituto de Astronomía, Universidad Católica del Norte, Angamos 0610, 1270709 Antofagasta, Chile
11. Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, UK