Radio emission in ultracool dwarfs: The nearby substellar triple system VHS 1256–1257J. C. Guirado, R. Azulay, B. Gauza, M. A. Pérez-Torres, R. Rebolo, J. B. Climent and M. R. Zapatero OsorioA&A, 610 (2018) A23DOI: https://doi.org/10.1051/0004-6361/201732130