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We report on the observations, analysis and interpretation of themicrolensing event MOA-2019- BLG-008. The observed anomaly in the photometriclight curve is best described through a binary lens model. In this model, thesource did not cross caustics and no finite source effects were observed.Therefore the angular Einstein ring radius cannot be measured from the lightcurve alone. However, the large event duration, t E about 80 days, allows aprecise measurement of the microlensing parallax. In addition to theconstraints on the angular radius and the apparent brightness I s of thesource, we employ the Besancon and GalMod galactic models to estimate thephysical properties of the lens. We find excellent agreement between thepredictions of the two Galactic models: the companion is likely a resident ofthe brown dwarf desert with a mass Mp about 30 MJup and the host is a mainsequence dwarf star. The lens lies along the line of sight to the GalacticBulge, at a distance of less then4 kpc. We estimate that in about 10 years, thelens and source will be separated by 55 mas, and it will be possible to confirmthe exact nature of the lensing system by using high-resolution imaging fromground or space-based observatories.

MOA-2019-BLG-008Lb: a new microlensing detection of an object at the planet/brown dwarf boundary