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Brown dwarfs and massive planets orbiting M dwarfs on short-period orbits are rare, but more have already been discovered than expected from planet formation models. TOI-519 is a valuable addition into this group of unlikely systems, and adds towards our understanding of the boundaries of planet formation.\n  Aims: We set out to determine the nature of the Transiting Exoplanet Survey Satellite (TESS ) object of interest TOI-519 b.\n","authors_text":"A. Fukui, A. Hernandez, A. Shporer, B. Wohler, D. Hidalgo Soto, D.R. Rodriguez, D.W. Latham, E.L.N. Jensen, E. Palle, F. Murgas, G. Chen, G. Nowak, G. Ricker, H. Parviainen, I. Wong, J.H. Livingston, J. Korth, J.M. Jenkins, J.N. Winn, J.P. de Leon, J.P. Doty, J. Prieto-Arranz, J. Villase\\~nor, K.A. Collins, K.G. Stassun, K.I. Collins, K. Kawauchi, M. Monelli, M. Mori, M. Paegert, M.R. Zapatero-Osorio, M. Tamura, N. Casasayas-Barris, N. Crouzet, N. Kusakabe, N. Narita, N. Watanabe, P. Klagyivik, P. Montanes Rodriguez, R. Luque, R. 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