Abstract
It is generally assumed that the Solar System is surrounded by a swarm of comets, the so-called Oort Cloud, which contains approximately 1011 members. The observed comets belong to a small subsection of the Cloud, and they have very elongated orbits. The origin of the Cloud is presently unclear. Here we consider the possibility that the comets were born in a star cluster together with the Sun. We follow the evolution of the star cluster with its embedded swarm of comets and calculate the rate at which stars accumulate stable comet companions. We conclude that if the Oort Cloud of comets was born in this process, then the present day density of comets in interstellar space has to be high, and that comets make a significant contribution to the overall mass density of the Galaxy.
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References
Aarseth, S. J.: 1971, ‘Numerical experiments on the N-body problem’, Astrophys. Space Sci., 14, 20.
Aarseth, S. J.: 1974, ‘Dynamical evolution of simualted star clusters. I. Isolated models’, Astron. Astrophys., 35, 237.
Donn, B.: 1976, ‘Comets, interstellar clouds and star clusters’, in The study of Comets, B. Donn (Ed.), p. 663. NASA: Washington.
McCrea, W. H.: 1975, ‘Solar system as space-probe’, The Observatory, 95, 239.
Oort, J. H.: 1950, ‘The structure of the cloud of comets surrounding the solar system, and a hypothesis concerning its origin’, Bull. Astron. Inst. Neth., 11, 91.
Robin, A. C., Creze, M. and Bienayme, O.: 1988, in Dark Matter, J. Audouze and J. Tran Thanh Van (Eds.), p. 239, Editions Frontières: Gif-sur-Yvette.
Sekanina, Z.: 1976, ‘A probability of encounter with interstellar comets and the likelihood of their existence’, Icarus, 27, 123.
Valtonen, M. J. and Innanen, K. A.: 1982, ‘The capture of interstellar comets’, Astrophys. J., 255, 307.
Valtonen, M. J. and Zheng, J. Q.: 1990, Proceedings of the Nordic-Baltic Astronomy Meeting in Uppsala, in press.
Weissman, P. R.: 1982, ‘Dynamical history of the Oort cloud’, in Comets, L. L. Wilkening (Ed.), p. 637. Univ. Arizona Press: Tucson.
Whipple, F. L.: 1975, ‘Do comets play a role in galactic chemistry and γ-ray bursts?’, Astron. J., 80, 525.
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Zheng, JQ., Valtonen, M.J. & Valtaoja, L. Capture of comets during the evolution of a star cluster and the origin of the Oort Cloud. Celestial Mech Dyn Astr 49, 265–272 (1990). https://doi.org/10.1007/BF00049417
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DOI: https://doi.org/10.1007/BF00049417