The High Energy X-ray Probe (HEX-P): Probing accretion onto stellar mass black holes

HEX-P is a probe-class mission concept that will combine high spatial resolution X-ray imaging (<10 arcsec FWHM) and broad spectral coverage (0.1-150 keV) with an effective area far superior to current facilities (including XMM-Newton and NuSTAR), to enable revolutionary new insights into a variety of important astrophysical problems. We will present a summary of simulations of HEX-P observations of accreting Galactic black holes in binary systems to demonstrate the power of this observatory to conduct binaries science. We show that HEX-P will allow us to: probe the physics and energetics of accretion flows in the vicinity of black holes; break the model degeneracies that hinder accurate and precise measurements of black hole spin; determine the physical and geometrical nature of the corona; and much more. More information on HEX-P, including the full team list, is available at https://hexp.org.