tokens: Acknowledgments This work was supported by the UKs Science and Technology Facilities Council, grant numbers ST/J001333/1, ST/M001008/1 and ST/L001403/1. We gratefully acknowledge the use of data from the ESO Public Survey program 179.B-2002 taken with the VISTA 4.1m telescope and data products from the Cambridge Astronomical Survey Unit. Support for DM and CC is provided by the Ministry of Economy, Development, and Tourisms Millennium Science Initiative through grant IC120009, awarded to the Millennium Institute of Astrophysics, MAS. DM is also supported by the Center for Astrophysics and Associated Technologies PFB-06 and Fondecyt Project No. 1130196. MSNK is supported by the Marie-Curie Intra-European fellowship project GESTATE (661249). This research has made use of the SIMBAD data base, operated at CDS, Strasbourg, France; also the SAO/NASA Astrophysics data (ADS). ACG was supported by the Science Foundation of Ireland, grant 13/ERC/I2907. We also acknowledge the support of CONICYT REDES project No. 140042 Young variables and proper motion in the Galactic plane. ValparaisoHertfordshire collaboration C. Contreras Pea was supported by a University of Hertfordshire PhD studentship in the earlier stages of this research. We thank Janet Drew for her helpful comments on the structure of the paper.
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