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We report striking changes in the broadband spectrum of the compact jet ofthe black hole transient MAXI J1836-194 over state transitions during itsdiscovery outburst in 2011. A fading of the optical-infrared (IR) flux occurredas the source entered the hard-intermediate state, followed by a brightening asit returned to the hard state. The optical-IR spectrum was consistent with apower law from optically thin synchrotron emission, except when the X-rayspectrum was softest. By fitting the radio to optical spectra with a brokenpower law, we constrain the frequency and flux of the optically thick/thinbreak in the jet synchrotron spectrum. The break gradually shifted to higherfrequencies as the source hardened at X-ray energies, from ~ 10^11 to ~ 4 x10^13 Hz. The radiative jet luminosity integrated over the spectrum appeared tobe greatest when the source entered the hard state during the outburst decay(although this is dependent on the high energy cooling break, which is not seendirectly), even though the radio flux was fading at the time. The physicalprocess responsible for suppressing and reactivating the jet (neither of whichare instantaneous but occur on timescales of weeks) is uncertain, but couldarise from the varying inner accretion disk radius regulating the fraction ofaccreting matter that is channeled into the jet. This provides an unprecedentedinsight into the connection between inflow and outflow, and has implicationsfor the conditions required for jets to be produced, and hence their launchingprocess.

An evolving compact jet in the black hole X-ray binary MAXI J1836-194