NGTS-19b: a high-mass transiting brown dwarf in a 17-d eccentric orbit

We present the discovery of NGTS-19b, a high mass transiting brown dwarf discovered by Next Generation Transit Survey (NGTS). investigate system using follow up photometry from South African Astronomical Observatory, as well sector 11 TESS data, in combination with radial velocity measurements CORALIE spectrograph to precisely characterise system. find that NGTS-19b is companion K-star, $69.5 ^{+5.7}_{-5.4}$ M$_{Jup}$ and radius $1.034 ^{+0.055}_{-0.053}$ R$_{Jup}$. The has reasonably long period 17.84 days, degree eccentricity $0.3767 ^{+0.0061}_{-0.0061}$. imply an age $0.46 ^{+0.26}_{-0.15}$ Gyr, however this inconsistent determined host star SED, suggesting may be inflated. This unusual given its large relatively low levels irradiation would make it much harder inflate. adds small, but growing number dwarfs main sequence stars, valuable addition we begin populate so called desert.