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MAXI J1836-194 is a Galactic black hole candidate X-ray binary that wasdiscovered in 2011 when it went into outburst. In this paper, we present thefull radio monitoring of this system during its `failed' outburst, in which thesource did not complete a full set of state changes, only transitioning as faras the hard intermediate state. Observations with the Karl G. Jansky Very LargeArray (VLA) and Australia Telescope Compact Array (ATCA) show that the jetproperties changed significantly during the outburst. The VLA observationsdetected linearly polarised emission at a level of ~1% early in the outburst,increasing to ~3% as the outburst peaked. High-resolution images with the VeryLong Baseline Array (VLBA) show a ~15 mas jet along the position angle $-21 \pm2^\circ$, in agreement with the electric vector position angle found from ourpolarisation results ($-21 \pm 4^\circ$), implying that the magnetic field isperpendicular to the jet. Astrometric observations suggest that the systemrequired an asymmetric natal kick to explain its observed space velocity.Comparing quasi-simultaneous X-ray monitoring with the 5 GHz VLA observationsfrom the 2011 outburst shows an unusually steep hard-state radio/X-raycorrelation of $L_{\rm R} \propto L_{\rm X}^{1.8\pm0.2}$, where $L_{\rm R}$ and$L_{\rm X}$ denote the radio and X-ray luminosities, respectively. With ATCAand Swift monitoring of the source during a period of re-brightening in 2012,we show that the system lay on the same steep correlation. Due to the lowinclination of this system, we then investigate the possibility that theobserved correlation may have been steepened by variable Doppler boosting.

Radio monitoring of the hard state jets in the 2011 outburst of MAXI J1836-194