Spectroscopic characterisation of microlensing events

National Science Foundation [0936648]; Fundacao para a Ciencia e a Tecnologia (FCT, Portugal) [PTDC/FIS-AST/1526/2014 (POCI-01-0145-FEDER-016886), SFRH/BPD/87776/2012, IF/00169/2012, IF/01037/2013, IF/00028/2014, UID/FIS/04434/2013 (POCI-01-0145-FEDER-007672)]; POPH/FSE (EC) by FEDER through the program "Programa Operacional de Factores de Competitividade - COMPETE"; European Union [627202]; European Research Council under the ERC [337591-ExTrA]; CNES; DIM ACAV, Region Ile de France; PERSU Sorbonne Universite; Programme National de Planetologie; CONICYT PAI/CONCURSO NACIONAL INSERCION EN LA ACADEMIA [CONVOCATORIA 2015 79150050]