tokens: This work has been made possible thanks to the ESAC Science Operations Division research funds, code EXPRO IPL-PSS/GP/gp/44.2014, plus support from the ESAC Space Science Faculty. Pablo Riviere-Marichalar and Carlo Manara acknowledge funding from the ESA Research Fellowship program. H. Bouy is funded by the Spanish Ramn y Cajal fellowship program number RYC-2009- 04497. This research made use of the SIMBAD database, operated at the CDS, Strasbourg, France. This work made extensive use of Topcat (TOPCAT http:// www.star.bristol.ac.uk/~mbt/topcat/ and STILTS, Taylor 2005, 2006). We thank the referee, Manuel Güdel, for his comments and corrections, which help to make this work complete. We would also like to thank Benjamin Montesinos and Nuria Huelamo for their comments and help.
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