Dynamical models of Kuiper Belt dust in the inner and outer Solar System

Details Dynamical models of Kuiper Belt dust in the inner and outer Solar System Dynamical models of Kuiper Belt dust in the inner and outer Solar System

2005-06-28

arxiv.org/abs/astro-ph/0506703v1

Astron.J.125:2255,2003

Astronomy and Astrophysics

Astrophysics

25 pages (pre-print format), including 5 figures. Published in AJ (2003)

Scientific paper

10.1086/368237

We report several results related to the dynamical evolution of dust produced in the Kuiper Belt (KB). We show that its particle size frequency distribution in space is greatly changed from the distribution at production, as a results of the combined effects of radiation forces and the perturbations of the planets. We estimate the contribution of KB dust to the zodiacal cloud by calculating the radial profile of its number density near the ecliptic. We also study the contribution of KB dust to the population of interplanetary dust particles (IDPs) collected at Earth, by calculating geocentric encounter velocities and capture rates. Our models show, in contrast with previous studies, that KB dust grains on Earth-crossing orbits have high eccentricities and inclinations and, therefore, their encounter velocities are similar to those of cometary grains and not to asteroidal grains. We estimate that at most 25% in number of captured IDPs have cometary or KB origin; the KB contribution may be as low as 1%-2%. We present the velocity field of KB dust throughout the solar system; this, together with the number density radial profile, is potentially useful for planning spacecraft missions to the outer solar system.

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