1. School of Physical Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK
2. SUPA, Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK
3. INAF Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, 35121 Padova, ITALY
4. Center for Space and Habitability, University of Bern, Bern 3012, Switzerland
5. CENTRA, Faculdade de Ciências, Universidade de Lisboa, Ed. C8, Campo Grande, P-1749-016 Lisboa, Portugal
6. SUPA, School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, UK
7. INAF - Osservatorio Astrofisico di Torino, Via Osservatorio 20, 10025, Pino Torinese, Italy
8. Department of Physics and Astronomy Galileo Galilei, University of Padova, Via dell’Osservatorio 3, I-35122 Padova, Italy