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tokens: We want to thank Dr. William Grundy for his useful comments that helped to improve this manuscript. V.L. and J.L. gratefully acknowledge support from the Spanish “Ministerio de Economía y Competitividad” (MINECO) projects AYA2012-39115-C03-03 and ESP2013-47816-C4-2-P. Based on observations made with the William Herschel Telescope operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.