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The recurring transient outbursts in low-mass X-ray binaries (LMXBs) provideus with strong test-beds for constraining the poorly understood accretionprocess. While impossible to image directly, phase-resolved spectroscopy canprovide a powerful diagnostic to study their highly complex, time-dependentaccretion discs. We present an 8-month long multi-wavelength (UV, optical,X-ray) monitoring campaign of the new candidate black hole LMXB MAXIJ0637$-$430 throughout its 2019/2020 outburst, using the {\em Neil GehrelsSwift Observatory}, as well as three quasi-simultaneous epochs of Gemini/GMOSoptical spectroscopy. We find evidence for the existence of a correlationbetween the X-ray irradiation heating the accretion disc and the evolution ofthe He {\sc ii} 4686 \AA emission line profiles detected in the opticalspectra. Our results demonstrate a connection between the line emitting regionsand physical properties of the X-ray irradiation heating the discs duringoutburst cycles of LMXBs. Further, we are able to show that changes in thephysical properties of the irradiation heating the disc in outburst can beimprinted within the H/He emission line profiles themselves in these systems.

monthly notices of the royal astronomical society

Using Optical Spectroscopy to Map the Geometry and Structure of the  Irradiated Accretion Discs in Low-mass X-ray Binaries: The Pilot-Study of  MAXI J0637$-$430