1. School of GeoSciences, University of Edinburgh , Edinburgh, EH9 3FF, UK
2. Centre for Exoplanet Science, University of Edinburgh , Edinburgh, EH9 3FD, UK
3. Institute of Astronomy , KU Leuven, B-3001 Leuven, Belgium
4. Department of Physics and Astronomy, Faculty of Environment, Science and Economy, University of Exeter , Exeter, EX4 4QL, UK
5. Yusuf Hamied Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, UK
6. National Centre for Atmospheric Science, Yusuf Hamied Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, UK