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With the aim of finding microlensing binaries containing brown-dwarf (BD)companions, we investigate the microlensing survey data collected during the2016--2018 seasons. For this purpose, we first conducted modeling of lensingevents with light curves exhibiting anomaly features that are likely to beproduced by binary lenses. We then sorted out BD-companion binary-lens eventsby applying the criterion that the companion-to-primary mass ratio is $q\lesssim 0.1$. From this procedure, we identify 6 binaries with candidate BDcompanions, including OGLE-2016-BLG-0890L, MOA-2017-BLG-477L,OGLE-2017-BLG-0614L, KMT-2018-BLG-0357L, OGLE-2018-BLG-1489L, andOGLE-2018-BLG-0360L. We estimate the masses of the binary companions byconducting Bayesian analyses using the observables of the individual lensingevents. According to the Bayesian estimation of the lens masses, theprobabilities for the lens companions of the events OGLE-2016-BLG-0890,OGLE-2017-BLG-0614, OGLE-2018-BLG-1489, and OGLE-2018-BLG-0360 to be in the BDmass regime are very high with $P_{\rm BD}> 80\%$. For MOA-2017-BLG-477 andKMT-2018-BLG-0357, the probabilities are relatively low with $P_{\rm BD}=61\%$and 69\%, respectively.

Brown-dwarf companions in microlensing binaries detected during the 2016--2018 seasons