Hydrodynamic Torques in Circumbinary Accretion Disks
arXiv:1903.00008 · doi:10.3847/1538-4357/ab09ee
Abstract
Gaseous disks have been proposed as a mechanism for facilitating mergers of binary black holes. We explore circumbinary disk systems to determine the evolution of the central binary. To do so, we perform 3D, hydrodynamic, locally isothermal simulations of circumbinary disks on a Cartesian grid. We focus on binaries of equal mass ratios on fixed circular orbits. To investigate the orbital evolution of the binary, we examine the various torques exerted on the system. For the case where the disk plane and binary orbital plane are aligned, we find that the total torque is positive so that the semi-major axis of the binary increases. For the misaligned case, we run simulations with the binary orbital plane and disk midplane misaligned by 45\degree and find the same results - the binary grows. The timescale for the circumbinary disk to realign to the plane of the binary is consistent with the global viscous timescale of the disk.
Accepted to ApJ. 13 pages, 19 figures
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- Population Estimates for Electromagnetically-Distinguishable Supermassive Binary Black Holes
- Circumbinary discs with radiative cooling and embedded planets