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Asteroidni pojas o migraciji planeta PDF Ispis E-mail
Slobodan Danko Bosanac   
Petak, 27 Veljača 2009
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Nature 457, 1109-1111 (26 February 2009)

A record of planet migration in the main asteroid belt

David A. Minton & Renu Malhotra

  1. Lunar and Planetary Laboratory, University of Arizona, 1629 East University Boulevard, Tucson, Arizona 85716, USA
The main asteroid belt lies between the orbits of Mars and Jupiter, but the region is not uniformly filled with asteroids. There are gaps, known as the Kirkwood gaps, in distinct locations that are associated with orbital resonances with the giant planets1; asteroids placed in these locations will follow chaotic orbits and be removed. Here we show that the observed distribution of main belt asteroids does not fill uniformly even those regions that are dynamically stable over the age of the Solar System. We find a pattern of excess depletion of asteroids, particularly just outward of the Kirkwood gaps associated with the 5:2, the 7:3 and the 2:1 Jovian resonances. These features are not accounted for by planetary perturbations in the current structure of the Solar System, but are consistent with dynamical ejection of asteroids by the sweeping of gravitational resonances during the migration of Jupiter and Saturn approx4 Gyr ago.
Zadnja Promjena ( Ponedjeljak, 02 Ožujak 2009 )
 
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