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| Titel |
Formation of the Resonant Populations in the Kuiper Belt |
| VerfasserIn |
E. Griv, I.-G. Jiang |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022575
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| Zusammenfassung |
| Kuiper belt objects (KBOs) have most of their orbits within a thick disk outside that of
Neptune as they are located around heliocentric distances in the range 35-50 AU. On the basis
of their orbital elements KBOs can be grouped into distinct dynamical classes, namely the
classical, the resonant, and the scattered ones. Resonant KBOs are trapped in mean-motion
resonances with Neptune, mainly 3:2 orbital period resonance at 39.4 AU. The same
resonance is also occupied by Pluto. In contrast, only a few KBOs are claimed to be
associated with the inner 5:4 and 4:3 resonances (34.9 and 36.4 AU, respectively) and the
outer 2:1 resonance (47.7 AU). Some other weak resonances are also clearly observed, for
instance, 5:3 and 7:3 resonances (42 and 44 AU). Jiang & Yeh (2004, 2007) have
proposed gas-drag-induced resonant capture in a protostellar disk analogous to the
primordial solar nebula as a mechanism able to explain the dominant 3:2 resonant
population observed in Kuiper belt objects. de La Fuente Marcos & de La Fuente
Marcos (2008) further investigated the drag-induced mechanism numerically. Our
significant contribution is just a hydrodynamic theory derivation of results obtained in
Jiang & Yeh (2004, 2007) and de La Fuente Marcos & de La Fuente Marcos (2008)
numerical simulations. The possibility of angular momentum and mass transport
arising in the solar nebula at outer Lindblad orbital resonances is discussed. We show
that the gas-drag-induced resonant process may lead to the formation of relatively
narrow, ~ 0.2 AU, KBO rings. The number of KBOs captured into the 3:2 resonance
may become a very large fraction of all objects, consistent with the observational
results.
The work was funded through the Israel Science Foundation, the Israeli Ministry of
Immigrant Absorption, and by the Theoretical Institute for Advanced Research in Taiwan. |
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