Structure and Dynamics of the Centaur Population: Constraints on the Origin of Short-Period Comets
- 40 Downloads
The origin of Jupiter-family comets is linked to the intermediate stage of evolution through the Centaur region. Thus the structure of the Centaur population provides important constraints on sources of short-period comets. We show that our model of the Oort cloud evolution gives results which are consistent with the orbital distribution of observed Centaurs. In particular, it explains the existence of the large population of Centaurs with semimajor axes greater than 60 AU. The main source for these objects is the inner Oort cloud. Both Jupiter-family and Halley-type comets are produced by Centaurs originating from the Oort cloud. The injection rate for Jupiter-family comets coming from the inner Oort cloud is, at least, not less than that for a model based on the observed sample of high-eccentricity trans-Neptunian objects.
Key words:Centaurs comets dynamics Oort Cloud origin trans-Neptunian objects
Unable to display preview. Download preview PDF.
This work was supported by RFBR (grants 04-02-96042 and 06-02-16512). The author thanks Hans Rickman and an anonymous referee for helpful comments.
- Emel’yanenko V. V.: 2005, in Z. Knežević and A. Milani (eds.), Dynamics of Populations of Planetary Systems. Proceedings IAU Colloquium No. 197, 31 August-4 September 2004, Belgrade, Serbia and Montenegro, Cambridge University Press, Cambridge, pp. 323–328.Google Scholar
- Fernández J. A. and Gallardo T.: 1999, in J. Svoreň, E. M. Pittich, and H. Rickman (eds.), Evolution and Source Regions of Asteroids and Comets. Proceedings IAU Colloquium 173, 24–28 August 1998, Tatranská Lomnica, Slovak Republic, Astron. Inst. Slovak Acad. Sci., Tatranská Lomnica, pp. 327–338Google Scholar