On the time evolution of the cometary influx in the region of the terrestrial planets

Computer Science – Numerical Analysis

Scientific paper

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Comets, Planetary Evolution, Solar System, Terrestrial Planets, Gravitational Effects, Neptune (Planet), Numerical Analysis, Uranus (Planet), Comets, Time Scale, Evolution, Flux, Terrestrial Planets, Giant Planets, Uranus, Neptune, Formation, Bombardment, Analysis, Oort Cloud, Origin, Gravity Effects, Perturbations, Orbits, Sources, Short-Period Comets

Scientific paper

Safronov (1969, 1972) has suggested that Uranus and Neptune, formed almost entirely of rocky and icy material, could have reached their present sizes only at the expense of a residual mass as large as one order of magnitude greater than their present masses. Fernandez and Ip (1981) have confirmed that, for cometesimal masses of 10 to the 16th to 10 to the 18th g, such a large initial mass was required for the formation of the two outermost planets, since the scattering of bodies by gravitational encounters rather than collisions becomes dominant as Uranus and Neptune grow. The present study outlines a possible scenario for cometary bodies reaching the region of the terrestrial planets. The dominant comet population was initially constituted of low inclination comets coming directly from the outer planetary region after their inward deflection by the Jovian planets. A residual cometary body population may have remained bound to the two planets in low inclination orbits.

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