Collisional Effects in the Edgeworth-Kuiper Belt
The Edgeworth—Kuiper (E—K) belt, a population of small bodies a thousand times greater in number than that of the main asteroid belt orbiting outside Neptune’s orbit, is undergoing collisional comminution. The discovery of these bodies confirmed strong dynamical evidence that short period comets come from a transneptunian source region. Like main belt asteroids, the size distribution of E—K belt objects has been affected by mutual impacts over Solar System history. Collisional evolution studies of the E-K belt show that bodies larger than several tens of km in diameter survive over times comparable to the age of the Solar System, hence their size distribution reflects accretionary processes in the early Solar System. At smaller sizes, however, impacts have produced a collisionally relaxed population of fragments which are predicted to have a power-law size distribution with an incremental diameter exponent near −3.5. Collisions can also inject km-sized fragments into dynamical resonances, whence they can be transported to the inner Solar System to become short period comets. However, dynamical mechanisms are needed to produce the Centaurs, a population of much larger bodies than the Jupiter family comets.
KeywordsDust Welding Lution Librium
Unable to display preview. Download preview PDF.
- Davis, D.R., Weidenschilling, S.J. and Farinella, P. (1999) Accretion of a massive Edgeworth-Kuiper belt, in Lunar Planet. Sci. XXX, Abstract #1883, Lunar and Planetary Institute, Houston (CD-ROM).Google Scholar
- Davis, D.R., Weidenschilling, S.J., Farinella, P. Paolicchi, P. and Binzel, R.P. (1989) Asteroid collisional history: Effects on sizes and spins, in Asteroids II (Eds. R.P. Binzel, T. Gehrels, and M.S. Matthews), Univ. of Arizona, Tucson, pp. 805–826.Google Scholar
- Davis, D.R., Farinella, P. and Weidenschilling, S.J. (2000) Accretion and collisional erosion of a massive Edgeworth-Kuiper belt: Constraints on the initial population, to be submitted to Icarus.Google Scholar
- Dell’Oro, A., Marzari, F., Paolicchi, P. and Vanzani, V. (2000). Updated collisional probabilities of minor body populations, submitted to Astron. Astrophys..Google Scholar
- Kuiper, G.P. (1951) On the origin of the solar system, in Astrophysics: A Topical Symposium, (J.A. Hynek, Ed.), McGraw-Hill, New York, pp. 357–424.Google Scholar
- Lissauer, J., Pollack, J.B., Wetherill, G.W. and Stevenson, D.J. (1995) Formation of the Neptune system, in Neptune and Triton, Univ. of Arizona Press, Tucson, pp. 37–108.Google Scholar