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Astrophysics and Space Science

, 361:371 | Cite as

Influence of the Centaurs and TNOs on the main belt and its families

  • Mattia A. GaliazzoEmail author
  • Paul Wiegert
  • Safwan Aljbaae
Original Article

Abstract

Centaurs are objects whose orbits are found between those of the giant planets. They are supposed to originate mainly from the Trans-Neptunian objects, and they are among the sources of Near-Earth Objects. Trans-Neptunian Objects (TNOs) cross Neptune’s orbit and produce the Centaurs. We investigate their interactions with main belt asteroids to determine if chaotic scattering caused by close encounters and impacts by these bodies may have played a role in the dynamical evolution of the main belt. We find that Centaurs and TNOs that reach the inner Solar System can modify the orbits of main belt asteroids, though only if their mass is of the order of \(10^{-9} m_{\odot }\) for single encounters or, one order less in case of multiple close encounters. Centaurs and TNOs are unlikely to have significantly dispersed young asteroid families in the main belt, but they could have perturbed some old asteroid families. Current main belt asteroids that originated as Centaurs or Trans-Neptunian Objects may lie in the outer belt with short lifetime \(\leq 4~\mbox{My}\), most likely between 2.8 and 3.2 au at larger eccentricities than typical of main belt asteroids.

Keywords

Minor planets Asteroids: general – celestial mechanics 

Notes

Acknowledgements

MAG wants to acknowledge the support by the Austrian FWF project P23810-N16 and the “Reitoria de pós-graduação da UNESP” (PROPg, grant PVExt-2015). The core part of this work was done when MAG has been present at UNESP as “visiting fellow”. MAG wants also to thanks Prof. V. Carruba for his important suggestions for the paper and Dr. Y. Cavecchi for suggestions in computational improvements and Prof. A. Morbidelli for data on the population decay of the TNOs. SA wants to thank Brazilian National Research Council (CNPq, grant 13/15357-1). This work was also supported in part by the Natural Sciences and Engineering Research Council of Canada.

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • Mattia A. Galiazzo
    • 1
    • 2
    • 3
    Email author
  • Paul Wiegert
    • 1
    • 2
  • Safwan Aljbaae
    • 4
  1. 1.Department of Physics and AstronomyThe University of Western OntarioLondonCanada
  2. 2.Institute of AstrophysicsUniversity of ViennaViennaAustria
  3. 3.Centre for Planetary Science and Exploration (CPSX)LondonCanada
  4. 4.UNESP, Grupo de dinâmica Orbital e PlanetologiaUniv. Estadual PaulistaGuaratinguetáBrazil

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