Abstract
We have studied the orbital evolution of micrometer-sized asteroidal dust particles under the influence of planetary gravitational perturbations, radiation pressure, Poynting-Robertson (PR) drag, and solar wind drag. It is found that a significant fraction of the 2-μm diameter particles, with β = 0.26, are thrown into the 1:1 mean motion resonance zone with Jupiter when they are released from their parent bodies. These particles stay trapped in this resonance for thousands of years and eventually get out of the resonance due to close encounters with Jupiter. Because of ongoing collisions in the asteroid belt, there is a continuous supply of dust particles around this size from the asteroidal belt contributed to the 1:1 resonance region. Therefore, there must exist a dust ring of asteroidal particles around 2 μm in diameter locked in the 1:1 resonance with Jupiter. We also discuss the structure of the ring, the dynamics of how particles are trapped, how they evolve, and how they get out of the resonance.
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