  This study focuses on the X-ray emission of low-mass black hole binaries in
massive Brans-Dicke gravity. First, we compute the accretion disk adopting the
well-known Shakura-Sunyaev model for an optically thick, cool, and
geometrically thin disk. Moreover, we assume that the gravitational field
generated by the stellar-mass black hole is an analogue of the Schwarzschild
space-time of Einstein's theory in massive Brans-Dicke gravity. We compute the
most relevant quantities of interest, i.e., i) the radial velocity, ii) the
energy and surface density, and iii) the pressure as a function entirely of the
radial coordinate. We also compute the soft spectral component of the X-ray
emission produced by the disk. Furthermore, we investigate in detail how the
mass of the scalar field modifies the properties of the binary as described by
the more standard Schwarzschild solution.

General Relativity and Quantum Cosmology;High Energy Astrophysical Phenomena