1. UK Centre for Astrobiology, School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK.
2. Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh, UK.
3. Max Planck Institute for Astronomy, Heidelberg, Germany.
4. Department of Earth Sciences, University of Toronto, Toronto, Canada.
5. Centre for Exoplanet Science, University of Edinburgh, Edinburgh, UK.
6. American Museum of Natural History, New York, New York, USA.