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arXiv:astro-ph/0004159 (astro-ph)
[Submitted on 12 Apr 2000]

Title:Smoothed Particle Hydrodynamics Simulations of Apsidal and Nodal Superhumps

Authors:Matt A. Wood, Michele M. Montgomery, James C. Simpson
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Abstract: In recent years a handful of systems have been observed to show "negative" (nodal) superhumps, with periods slightly shorter than the orbital period. It has been suggested that these modes are a consequence of the slow retrograde precession of the line of nodes in a disk tilted with respect to the orbital plane. Our simulations confirm and refine this model: they suggest a roughly axisymmetric, retrogradely-precessing, tilted disk that is driven at a period slightly less than half the orbital period as the tidal field of the orbiting secondary encounters in turn the two halves of the disk above and below the midplane. Each of these passings leads to viscous dissipation on one face of an optically-thick disk -- observers on opposite sides of the disk would each observe one brightening per orbit, but 180 degrees out of phase with each other.
Comments: 11 pages. Accepted for publication in The ApJ Letters
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0004159
  (or arXiv:astro-ph/0004159v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0004159
Related DOI: https://doi.org/10.1086/312687

Submission history

From: Matt A. Wood [view email]
[v1] Wed, 12 Apr 2000 15:41:08 UTC (196 KB)
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