The effects of tidally induced disc structure on white dwarf accretion in intermediate polars

Abstract

We investigate the effects of tidally induced asymmetric disc structure on accretion onto the white dwarf in intermediate polars. Using numerical simulation, we show that it is possible for tidally induced spiral waves to propagate sufficiently far into the disc of an intermediate polar that accretion onto the central white dwarf could be modulated as a result. We suggest that accretion from the resulting asymmetric inner disc may contribute to the observed X-ray and optical periodicities in the light curves of these systems. In contrast to the stream-fed accretion model for these periodicities, the tidal picture predicts that modulation can exist even for systems with weaker magnetic fields where the magnetospheric radius is smaller than the radius of periastron of the mass transfer stream. We also predict that additional periodic components should exist in the emission from low mass ratio intermediate polars displaying superhumps.

9 pages, 5 figures, accepted for publication in MNRAS

References in corpus (5)

• Three-dimensional waves generated at Lindblad resonances in thermally stratified disks
• Hydrodynamics of the stream-disk impact in interacting binaries
• Simulations of superhumps and superoutbursts
• Tilted accretion discs in cataclysmic variables: tidal instabilities and superhumps
• Simulations of spiral structure in the accretion disc of IP Pegasi during outburst

Cited by in corpus (6)

• The Role of Tidal Interactions in Star Formation
• Variable line profiles due to non-axisymmetric patterns in an accretion disc around a rotating black hole
• The Rise and Fall of the King: The Correlation between FO Aquarii's Low States and the White Dwarf's Spindown
• Hitting a New Low: The Unique 28 h Cessation of Accretion in the TESS Light Curve of YY Dra (DO Dra)
• Identification of a 12-17 day timescale in X-ray observations of GRS 1915+105
• Outbursts of Young Stellar Objects