From icy planetesimals to outer planets and comets

Details From icy planetesimals to outer planets and comets From icy planetesimals to outer planets and comets

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...59...87g&link_type=abstract

Icarus (ISSN 0019-1035), vol. 59, July 1984, p. 87-113.

Other

72

Comets, Neptune (Planet), Planetary Evolution, Protoplanets, Solar System, Uranus (Planet), Astronomical Models, Computerized Simulation, Oort Cloud, Size Distribution, Planets, Giant Planets, Comets, Icy Bodies, Simulations, Formation, Uranus, Neptune, Planetesimals, Gravity Effect, Oort Cloud, Models, Size, Grains, Collisions, Evolution, Distribution, Origin, Source, Observations, Calculations, Data, Hypotheses

Scientific paper

Numerical simulations of planet growth in the outer solar system show that growth of Uranus and Neptune occurs in reasonably short time, well below the actual age of the system, without the need for ad hoc assumptions about excess mass or artificially low relative velocities among the icy planetesimals. The authors' model shows that gravitational clumping occurred in successive portions of the material that reached the midplane, producing "initial" planetesimals probably of comet-like sizes. Models of subsequent collisional evolution show that such an initial size distribution, similar to known comets, would have been required in order to have an adequate comet-like size distribution available to feed the Oort cloud as the other planets reach full size. Comets are probably unaltered remnants of the initial population of planetesimals in the outer solar system, not fragments of larger bodies.

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