Incompressible Modes Excited by Supersonic Shear in Boundary Layers: Acoustic CFS Instability
arXiv:1610.04289 · doi:10.3847/1538-4357/835/2/238
Abstract
We present an instability for exciting incompressible modes (e.g. gravity or Rossby modes) at the surface of a star accreting through a boundary layer. The instability excites a stellar mode by sourcing an acoustic wave in the disk at the boundary layer, which carries a flux of energy and angular momentum with the opposite sign as the energy and angular momentum density of the stellar mode. We call this instability the acoustic CFS instability, because of the direct analogy to the Chandrasekhar-Friedman-Schutz instability for exciting modes on a rotating star by emission of energy in the form of gravitational waves. However, the acoustic CFS instability differs from its gravitational wave counterpart in that the fluid medium in which the acoustic wave propagates (i.e.\ the accretion disk) typically rotates faster than the star in which the incompressible mode is sourced. For this reason, the instability can operate even for a non-rotating star in the presence of an accretion disk. We discuss applications of our results to high-frequency quasi-periodic oscillations in accreting black hole and neutron star systems and dwarf nova oscillations in cataclysmic variables.
arXiv comment34 pages, 4 figures, submitted to ApJ
References in corpus (27)
- Rossby Wave Instability of Keplerian Accretion Disks
- A Global Three Dimensional Radiation Magneto-hydrodynamic Simulation of Super-Eddington Accretion Disks
- Rossby Wave Instability of Thin Accretion Disks -- II. Detailed Linear Theory
- Rossby Wave Instability of Thin Accretion Disks - III. Nonlinear Simulations
- A quasi-periodic modulation of the iron line centroid energy in the black hole binary H 1743-322
- Global simulations of axisymmetric radiative black hole accretion disks in general relativity with a sub-grid magnetic dynamo
- R-Mode Oscillations and Spindown of Young Rotating Magnetic Neutron Stars
- The X-ray and extreme-ultraviolet flux evolution of SS Cygni throughout outburst
- Dwarf Nova Oscillations and Quasi-Periodic Oscillations in Cataclysmic Variables: II. A Low Inertia Magnetic Accretor Model
- Three Dimensional MHD Simulations of Accretion to an Inclined Rotator: The "Cubed Sphere" Method
- Quasi-Periodic Oscillations from Rayleigh-Taylor and Kelvin-Helmholtz Instability at a Disk-Magnetosphere Interface
- High-Frequency and Type-C QPOs from Oscillating, Precessing Hot, Thick Flow
- Non-Axisymmetric g-Mode and p-Mode Instability in a Hydrodynamic Thin Accretion Disk
- MRI-driven Accretion on to Magnetized stars: Global 3D MHD Simulations of Magnetospheric and Boundary Layer Regimes
- Corotational Instability of Inertial-Acoustic Modes in Black Hole Accretion Discs and Quasi-Periodic Oscillations
- Angular Momentum Transport by Acoustic Modes Generated in the Boundary Layer I: Hydrodynamical Theory and Simulations
- Super-Reflection in Fluid Discs: Corotation Amplifier, Corotation Resonance, Rossby Waves, and Overstable Modes
- Supersonic Shear Instabilities in Astrophysical Boundary Layers
- How strong are the Rossby vortices?
- Angular Momentum Transport and Variability in Boundary Layers of Accretion Disks Driven by Global Acoustic Modes
- On Hydromagnetic Stresses in Accretion Disk Boundary Layers
- Corotational Instability of Inertial-Acoustic Modes in Black-Hole Accretion Discs: Non-Barotropic Flows
- Angular Momentum Transport by Acoustic Modes Generated in the Boundary Layer II: MHD Simulations
- Spreading layers in accreting objects: role of acoustic waves for angular momentum transport, mixing and thermodynamics
- A Spreading Layer Origin for Dwarf Nova Oscillations
- Wave mediated angular momentum transport in astrophysical boundary layers
- Interface Modes and Their Instabilities in Accretion Disc Boundary Layers
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- Boundary Layers of Accretion Disks: Discovery of Vortex-Driven Modes and Other Waves
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- Kilohertz quasi-periodic oscillations from neutron star spreading layers
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