Presentation #103.79 in the session Missions and Instruments.
The high-resolution spectra observed by XRISM will transform our understanding of a broad range of astrophysical systems, including the physics of X-ray binaries (XRBs). With unprecedented spectral resolution in the Fe Ka band, XRISM will enable studies into little-known physical processes in the vicinity of the compact accretor, such as details of the feedback mechanism, physics at supranuclear densities, and disk–jet coupling. High-quality XRISM spectra will reveal the origin of the broad Fe Ka line in XRBs, addressing key unknowns about the drivers of binary outflows, accretion disk dynamics, and the geometry and kinematics of XRBs. These observations will also provide a powerful diagnostic of the accretor properties, such as radius, inclination, and mass. Here we highlight the capacity of XRISM to explore the physics of XRBs in the above areas through various line-intensity and line-ratio diagnostics using the spectral synthesis code CLOUDY.