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Effect of the tensile strength on the stability against rotational breakup of icy bodies

Published online by Cambridge University Press:  06 April 2010

Imre Toth  and
Carey M. Lisse
Imre Toth
Affiliation:
Konkoly Observatory, Postbus 67, H-1525 Budapest, Hungary email: [email protected]
Carey M. Lisse
Affiliation:
Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723-6099, USA email: [email protected]
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Abstract

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Focusing on primitive icy minor bodies in the solar system like cometary nuclei, centaurs, transneptunian objects (TNOs), and main-belt comets (MBCs) we investigate the stability of these objects against rotational breakup by comparing their location in (radius – rotational period) space with respect to separation lines of the stable and breakup zones in this plane. We estimate the bulk tensile strength according to new structural and elasto-mechanical models of grain-aggregates, using these tensile strengths to compute separation lines. We note that the process of grain coagulation and growth is highly uncertain in the field of solar system formation and we simply don't know how to grow interstellar grains to aggregates larger than about 1 mm but we apply in our calculations the recently available elasto-mechanical models of grain-aggregates. Accorging to this study most of the observed comets, centaurs, TNOs, and MBCs are stable against rotational breakup, with a few notable exceptions. E.g., we suggest that the rotational fission is a likely scenario for the Haumea-family in the Kuiper belt.

Keywords

solar system: generalsolar system: formationcomets: generalcomets: individual (133P/Elst-Pizarro)CentaursKuiper BeltHaumea-familyasteroidsMain-Belt Comets
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S263: Icy Bodies of the Solar System , August 2009 , pp. 131 - 140
Copyright
Copyright © International Astronomical Union 2010

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