Non-linear single-armed spiral density waves in nearly Keplerian discs

Erick Lee, Jeremy Goodman

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

Single-armed, stationary density waves can exist even in discs with only weak self-gravity, provided that the rotation curve is dominated by a central mass. Such waves could play a significant role in the transport of angular momentum. By variational methods, we derive non-linear versions of the dispersion relation, angular momentum flux and propagation velocity in the tight-winding limit. The pitch angle increases with amplitude until the tight-winding approximation breaks down. By other methods, we find a series of non-linear logarithmic spirals which is exact in the limit of small disc mass and which extends to large pitch angle. These waves may be supported by low-mass protoplanetary discs, and perhaps by compact molecular discs in galactic nuclei.

Original languageEnglish (US)
Pages (from-to)984-994
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume308
Issue number4
StatePublished - Oct 1 1999

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Accretion: accretion discs
  • Galaxies: nuclei
  • Hydrodynamics
  • Solar system: formation
  • Waves

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