1. Dipartimento di Fisica “E.R. Caianiello”, Università di Salerno, Via Giovanni Paolo II 132, Fisciano, I-84084, Italy
2. Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Via Cintia, I-80126 Napoli, Italy
3. Las Cumbres Observatory, 6740 Cortona Drive, Suite 102, Goleta, CA 93117, USA
4. Centre for Exoplanet Science, SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, UK
5. Department of Physics, Westminster College, New Wilmington, PA 16172, USA
6. Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg (ZAH), D-69120 Heidelberg, Germany