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We present the discovery of NGTS-7Ab, a high mass brown dwarf transiting an Mdwarf with a period of 16.2 hours, discovered as part of the Next GenerationTransit Survey (NGTS). This is the shortest period transiting brown dwarfaround a main or pre-main sequence star to date. The M star host (NGTS-7A) hasan age of roughly 55 Myr and is in a state of spin-orbit synchronisation, whichwe attribute to tidal interaction with the brown dwarf acting to spin up thestar. The host star is magnetically active and shows multiple flares across theNGTS and follow up lightcurves, which we use to probe the flare-starspot phaserelation. The host star also has an M star companion at a separation of 1.13arcseconds with very similar proper motion and systemic velocity, suggestingthe NGTS-7 system is a hierarchical triple. The combination of tidalsynchronisation and magnetic braking is expected to drive ongoing decay of thebrown dwarf orbit, with a remaining lifetime of only 5-10 Myr.

NGTS-7Ab: An ultra-short period brown dwarf transiting a tidally-locked and active M dwarf