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tokens: MAB thanks Tomas Ruiz Lara, Mina Koleva, Ryan Leaman, John Beckman, Chris Flynn, Bradley Gibson and Marie Martig for useful discussions. This paper is based on observations made with the GTC, installed in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias, on the island of La Palma. This research has made extensive use of the NED which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research also made use of aplpy , an open-source plotting package for python hosted at http://aplpy.github.com , NASA's Astrophysics Data System and iraf , which is distributed by the National Optical Astronomy Observatory and operated by the Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation. The IAC researchers acknowledge financial support from the Spanish Ministry of Economy and Competitiveness (MINECO) under the 2011 Severo Ochoa Program MINECO SEV-2011-0187. CG and AA are partially funded by the Science and technology Ministry of Spain (grant AYA 2010-16717). MB acknowledges support from grant AYA2013-48226-C3-1-P from the Spanish Ministry of Economy and Competitiveness (MINECO).