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Magnetic, radiation pressure, and thermal driving are the three mechanismscapable of launching accretion disk winds. In X-ray binaries, radiationpressure is often not significant, as in many systems the luminosity is too lowfor driving due to continuum transitions yet too high for driving due to linetransitions. This leaves thermal and magnetic driving as the contenderlaunching mechanisms in these systems. Using Athena++, we perform axisymmetricideal MHD simulations that include radiative heating and cooling processesappropriate for Compton heated winds to show that the inclusion of magneticfields into a thermally driven wind has the opposite effect of what one mightexpect: rather than provide a velocity boost, the thermal wind is suppressed inlow plasma beta regions where the field lines are strong enough to reshape thedirection of the flow. Our analysis reveals that magneto-centrifugal launchingis present but weak, while the reduction in wind velocity is not due to thechange in gravitational potential through the magnetically imposed streamlinegeometry, but rather due to the increased flow tube area just above the surfaceof the disk, which is less conducive to acceleration. Our results suggest thatfor magnetothermal wind models to be successful at producing fast denseoutflows in low mass X-ray binaries, the winds must be magnetically launchedwell within the Compton radius.

Magnetothermal disk winds in X-ray binaries: poloidal magnetic fields suppress thermal winds