Title

Atlas of tilted accretion discs and source to negative superhumps

Authors

Authors

M. M. Montgomery

Comments

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Abbreviated Journal Title

Mon. Not. Roy. Astron. Soc.

Keywords

accretion, accretion discs; hydrodynamics; Methods: numerical; binaries:; close; novae, cataclysmic variables; SMOOTHED PARTICLE HYDRODYNAMICS; DRIVEN ECCENTRIC INSTABILITIES; SU-UMA; STARS; CATACLYSMIC VARIABLES; NUMERICAL SIMULATIONS; TV-COLUMBAE; SPH; SIMULATIONS; BINARY-SYSTEMS; HIGH STATE; BH LYNCIS; Astronomy & Astrophysics

Abstract

Using smoothed particle hydrodynamics. we numerically simulate steady-state accretion discs for cataclysmic variable dwarf novae systems that have a secondary-to-primary mass ratio 0.35 <= q <= 0.55. After these accretion discs have cone to quasi-equilibrium, we rotate each disc Out of the orbital plane by delta = (1, 2, 3, 4, 5 or 20)degrees to induce negative superhumps. For accretion discs tilted 5 degrees. we generate light Curves and associated Fourier transforms for atlas oil negative superhumps and retrograde precession. Our simulation results suggest that accretion discs need to be tilted more than 3 degrees for negative superhumps to be statistically significant. We also show that if the disc is tilted enough Such that the gas stream strikes a disc face, then it dense cooling ring is generated near the radius of impact. In addition to the atlas, we study these artificially tilted accretion discs to find the Source to negative superhumps. Our results suggest that the source is additional light from innermost disc annuli, and this additional light waxes and wanes with the amount of gas stream overflow received as the secondary orbits. The nodes, where the gas stream transitions from flowing Over to Under the disc rim (and vice versa), precess in the retrograde direction.

Journal Title

Monthly Notices of the Royal Astronomical Society

Volume

394

Issue/Number

4

Publication Date

1-1-2009

Document Type

Article

Language

English

First Page

1897

Last Page

1907

WOS Identifier

WOS:000266549600016

ISSN

0035-8711

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