Primitive Sculpting — a Brief History
At the same time, there were attempts to understand the orbits element distribution of the KB.
- Malhotra (1995) showed that Neptune's migration can begin to explain KB resonant structure.
- However, the migration only gives you trapping in the resonances. (see Hahn & Malhotra 2005)
- It does not produce the high inclinations or a 2 component main belt.
- It does not produce an edge.
- It does not produce enough mass depletion.
- Nonetheless, this work convinced people that the planets move and the KB can be diagnostic.
- Gomes (2003) found that objects being scattered by Neptune can be trapped in the KB.
- Produces both resonant population and the hot main belt, but probably not small enough e's.
- Mass depletion not a problem for these populations because of small capture efficiency.
- Argued that the cold main belt is primordial, so mass depletion still a problem.
- Levison & Morbidelli (2003) argued that the mass depletion problem can be circumvented if:
- The planetesimal disk was truncated at 30AU and the entire KB was pushed out.
- We pushed out the cold Kuiper belt with the 1:2MMR, thereby producing the edge.
- The eccentricities stay small if there is a lot of mass in the resonance due to secular effects,
- This seemed to work fairly well!
20AU
........... 22AU
........... 24AU
........... 26AU
........... 28AU
........... 30AU
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nc
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