Two-dimensional simulations of disks in close binaries: Simulating outburst cycles in cataclysmic variables

Abstract

Previous simulations of cataclysmic variables studied either the quiescence, or the outburst state in multiple dimensions or they simulated complete outburst cycles in one dimension using simplified models for the gravitational torques. We self-consistently simulate complete outburst cycles of normal and superoutbursts in cataclysmic variable systems in two dimensions. We study the effect of different $\alpha$ viscosity parameters, mass transfer rates, and binary mass ratios on the disk luminosities, outburst occurrence rates, and superhumps. We simulate non-isothermal, viscous accretion disks in cataclysmic variable systems using a modified version of the FARGO code with an updated equation of state and a cooling function designed to reproduce s-curve behavior. Our simulations can model complete outburst cycles using the thermal tidal instability model. We find higher superhump amplitudes and stronger gravitational torques than previous studies, resulting in better agreement with observations.

Accepted in A&A. 21 pages, 27 figures

References in corpus (22)

• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• A comparative study of disc-planet interaction
• Viscous Hydrodynamics Simulations of Circumbinary Accretion Discs: Variability, Quasi-Steady State, and Angular Momentum Transfer
• Treating gravity in thin disk simulations
• Strong disc winds traced throughout outbursts in black-hole X-ray binaries
• Stability of helium accretion discs in ultracompact binaries
• Convection Causes Enhanced Magnetic Turbulence in Accretion Disks in Outburst
• The dynamics of eccentric accretion discs in superhump systems
• The evolutionary status of Cataclysmic Variables: Eclipse modelling of 15 systems
• The viscosity parameter alpha and the properties of accretion disc outbursts in close binaries
• Comprehensive simulations of superhumps
• Dwarf Nova Outbursts with Magnetorotational Turbulence
• Viscous overstability and eccentricity evolution in three-dimensional gaseous discs
• The cataclysmic variable orbital period gap: More evident than ever
• A comparative study of the strength of flickering in cataclysmic variables
• Evolution of irradiated Circumbinary Disks
• Impact of convection and resistivity on angular momentum transport in dwarf novae
• Mass transfer variation in the outburst model of dwarf novae and soft X-ray transients
• Tilt, Warp, and Simultaneous Precessions in Disks
• PHL 1445: An eclipsing cataclysmic variable with a substellar donor near the period minimum
• Disks in close binary stars: γ-Cephei revisited
• L1 Stream Deflection and Ballistic Launching at the Disk Bow Shock: An Absorption-line Velocity Analysis in Semi-detached Binaries

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