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Phase-resolved spectroscopy, optical and infrared light curves, and precise astrometry from Gaia allow us to constrain the masses, radii, and temperatures of both components with few-percent precision. We infer a BD mass of $M_{\\rm BD} = 80.1\\pm 1.6\\,M_{\\rm J}$, almost exactly at the stellar/substellar boundary, and a moderately inflated radius, $R_{\\rm BD} = 1.05\\pm 0.02\\,R_{\\rm J}$. 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Rodriguez, Jan van Roestel, Kareem El-Badry, Kevin B. Burdge","submitted_at":"2023-07-28T18:00:00Z","abstract_excerpt":"We report the discovery of ZTF J2020+5033, a high-mass brown dwarf (BD) transiting a low-mass star with an orbital period of 1.90 hours. Phase-resolved spectroscopy, optical and infrared light curves, and precise astrometry from Gaia allow us to constrain the masses, radii, and temperatures of both components with few-percent precision. We infer a BD mass of $M_{\\rm BD} = 80.1\\pm 1.6\\,M_{\\rm J}$, almost exactly at the stellar/substellar boundary, and a moderately inflated radius, $R_{\\rm BD} = 1.05\\pm 0.02\\,R_{\\rm J}$. 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