TILT, WARP, AND SIMULTANEOUS PRECESSIONS IN DISKS
Abbreviated Journal Title
Astrophys. J. Lett.
accretion, accretion disks; binaries: close; binaries: general; novae, ; cataclysmic variables; stars: dwarf novae; PARTICLE HYDRODYNAMICS SIMULATIONS; ACCRETION DISKS; NUMERICAL; SIMULATIONS; NEGATIVE SUPERHUMPS; NODAL SUPERHUMPS; VARIABLES; DISCS; NOVA; Astronomy & Astrophysics
Warps are suspected in disks around massive compact objects. However, the proposed warping source-non-axisymmetric radiation pressure-does not apply to white dwarfs. In this Letter, we report the first smoothed particle hydrodynamic simulations of accretion disks in SU UMa-type systems that naturally tilt, warp, and simultaneously precess in the prograde and retrograde directions using white dwarf V344 Lyrae in the Kepler field as our model. After similar to 79 days in V344 Lyrae, the disk angular momentum L-d becomes misaligned to the orbital angular momentum L-o. As the gas stream remains normal to L-o, hydrodynamics (e. g., the lift force) is a likely source to disk tilt. In addition to tilt, the outer disk annuli cyclically change shape from circular to highly eccentric due to tidal torques by the secondary star. The effect of simultaneous prograde and retrograde precession is a warp of the colder, denser midplane as seen along the disk rim. The simulated rate of apsidal advance to nodal regression per orbit nearly matches the observed ratio in V344 Lyrae.
Astrophysical Journal Letters
"TILT, WARP, AND SIMULTANEOUS PRECESSIONS IN DISKS" (2012). Faculty Bibliography 2010s. 3043.