Long-term effects of the Galactic tide on cometary dynamics View Full Text


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Article Info

DATE

2006-05

AUTHORS

Marc Fouchard, Christiane Froeschlé, Giovanni Valsecchi, Hans Rickman

ABSTRACT

We introduce a model for integrating the effects of Galactic tides on Oort cloud comets, which involves two procedures, according to the values of the osculating semi-major axis a and eccentricity e. Ten simulations of the dynamics of 106 comets over 5 Gyr are performed using this model. We thus investigate the long-term effects of the Galactic tide with and without a radial component, the effects of the local density of the Galactic disk, and those of the Oort constants. Most of the results may be understood in terms of the integrability or non-integrability of the system. For an integrable system, which occurs for moderate semi-major axes with or without radial component, the dynamics is explained by periodic variation of the cometary perihelion, inducing the depletion of the outer region of the Oort cloud, a constant flux from the inner region after 500 Myr, and the quick formation of a reservoir of comets with argument of perihelion near 26.6°. When the system is non-integrable, the efficiency of the tide in reducing the cometary perihelion distance is enhanced both by replenishing the Oort cloud domain from which comets are sent toward the planetary system, and by reducing the minimal value that the perihelion distance may reach. No effects of varying the Oort constants were observed, showing that the flat rotation curve is a satisfactory approximation in Oort cloud dynamics. More... »

PAGES

299-326

References to SciGraph publications

  • 2001-03. Canonical Elements for Collision Orbits in CELESTIAL MECHANICS AND DYNAMICAL ASTRONOMY
  • 2006-02. Canonical Elements for Öpik Theory in CELESTIAL MECHANICS AND DYNAMICAL ASTRONOMY
  • 1992-03. A model of the galactic tidal interaction with the oort comet cloud in CELESTIAL MECHANICS AND DYNAMICAL ASTRONOMY
  • 2005-09. Comparison between Different Models of Galactic Tidal Effects on Cometary Orbits in CELESTIAL MECHANICS AND DYNAMICAL ASTRONOMY
  • 1985. An Efficient Integrator that Uses Gauss-Radau Spacings in DYNAMICS OF COMETS: THEIR ORIGIN AND EVOLUTION
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s10569-006-9027-8

    DOI

    http://dx.doi.org/10.1007/s10569-006-9027-8

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1009416228


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