tokens: Acknowledgements This research was supported by the Italian Ministry of Education, University, and Research through the PREMIALEWOW 2013 research project under grant Ricerca di pianeti intorno a stelle di piccola massa. J.M. acknowledges support from the Ariel ASI-INAF agreement N. 2015-038-R.0. E.V. and C.E. acknowledge support from the On the rocks project funded by the Spanish Ministerio de Economía y Competitividad under grant AYA2014-55840-P. We sincerely appreciate the careful reading of the manuscript and the constructive comments of the anonymous referee.
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