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While the sources of X-ray and radio emission in the different states oflow-mass X-ray binaries are relatively well understood, the origin of thenear-infrared (NIR) and optical emission is more often debated. It is likelythat the NIR/optical flux originates from an amalgam of different emissionregions, because it occurs at the intersecting wavelengths of multipleprocesses. We aim to identify the NIR/optical emission region(s) of one suchlow-mass X-ray binary and black hole candidate, XTE J1650-500, via photometric,timing, and spectral analyses. We present unique NIR/optical images andspectra, obtained with the ESO-New Technology Telescope, during the peak of the2001 outburst of XTE J1650-500. The data suggest that the NIR/optical flux isdue to a combination of emission mechanisms including a significantcontribution from X-ray reprocessing and, at early times in the hard state, arelativistic jet that is NIR/radio dim compared to similar sources.The jet ofXTE J1650-500 is relatively weak compared to that of other black hole low-massX-ray binaries, possibly because we observe as it is being "turned off" orquenched at the state transition. While there are several outliers to theradio--X-ray correlation of the hard state of low-mass X-ray binaries, XTEJ1650-500 is the first example of an outlier to the NIR/optical--X-raycorrelation.

Disentangling the NIR/optical emission of the black hole XTE J1650-500 during outburst