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 planets; 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 approximately 4 Gyr ago.
Depletion of the Outer Asteroid BeltJC Liou et al. Science 275 (5298), 375-7. PMID 8994031.During the early history of the solar system, it is likely that the outer planets changed their distance from the sun, and hence, their influence on the asteroid belt evo …
Terrestrial Planet and Asteroid Formation in the Presence of Giant Planets. I. Relative Velocities of Planetesimals Subject to Jupiter and Saturn PerturbationsSJ Kortenkamp et al. Icarus 143 (1), 60-73. PMID 11543321.We investigate the orbital evolution of 10(13)- to 10(25) -g planetesimals near 1 AU and in the asteroid belt (near 2.6 AU) prior to the stage of evolution when the mutua …
The Origin of Planetary Impactors in the Inner Solar SystemRG Strom et al. Science 309 (5742), 1847-50. PMID 16166515.Insights into the history of the inner solar system can be derived from the impact cratering record of the Moon, Mars, Venus, and Mercury and from the size distributions …
D/H Ratios of the Inner Solar SystemLJ Hallis. Philos Trans A Math Phys Eng Sci 375 (2094). PMID 28416726. - ReviewThe original hydrogen isotope (D/H) ratios of different planetary bodies may indicate where each body formed in the Solar System. However, geological and atmospheric proc …
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Cited by 2 PubMed Central articles
Growth of Asteroids, Planetary Embryos, and Kuiper Belt Objects by Chondrule AccretionA Johansen et al. Sci Adv 1 (3), e1500109. PMID 26601169.Chondrules are millimeter-sized spherules that dominate primitive meteorites (chondrites) originating from the asteroid belt. The incorporation of chondrules into asteroi …
Asteroids: When Planets MigrateKJ Walsh. Nature 457 (7233), 1091-3. PMID 19242463.