tokens: Acknowledgements We are very grateful to the staff of the Observatorio del Teide providing excellent support to the operation of the IAC80 and Carlos Sánchez telescopes, and in particular to Álex Oscoz for a generous allocation of time to this project that proved to be essential to its success. We are also equally thankful to the staff of Calar Alto observatory for their support during our AstraLux observing run. The constructive remarks by an anonymous referee helped to improve the presentation of our results. NS acknowledges support by the French ANR and the German DFG through the project “GENESIS” (ANR-16-CE92-0035-01/DFG1591/2-1). This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.
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