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Accretion disks; hydrodynamics; instabilities; methods:; analytical; planet-disk interactions; protoplanetary disks; X-RAY BINARIES; NEGATIVE SUPERHUMPS; PROTOSTELLAR DISCS; CATACLYSMIC; VARIABLES; LONG PERIODS; HERCULIS X-1; YOUNG STARS; ORIGIN; SIMULATIONS; PRECESSION; Astronomy & Astrophysics
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A Common Source Of Accretion Disk Tilt, M. M. Montgomery, E. L. Martin
A Common Source Of Accretion Disk Tilt, M. M. Montgomery, E. L. Martin
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Many different system types retrogradely precess, and retrograde precession could be from a tidal torque by the secondary on a misaligned accretion disk. However, a source that causes and maintains disk tilt is unknown. In this work, we show that accretion disks can tilt due to a force called lift. Lift results from differing gas stream supersonic speeds over and under an accretion disk. Because lift acts at the disk's center of pressure, a torque is applied around a rotation axis passing through the disk's center of mass. The disk responds to lift by pitching around the disk's line of …