Probabilities of collisions of planetesimals from different regions of the feeding zone of the terrestrial planets with the forming planets and the Moon

Abstract

Migration of planetesimals from the feeding zone of the terrestrial planets, which was divided into seven regions depending on the distance to the Sun, was simulated. The influence of gravity of all planets was taken into account. In some cases, the embryos of the terrestrial planets rather than the planets themselves were considered; their masses were assumed to be 0.1 or 0.3 of the current masses of the planets. The arrays of orbital elements of migrated planetesimals were used to calculate the probabilities of their collisions with the planets, the Moon, or their embryos. Based on our calculations, we drew conclusions on the process of accumulation of the terrestrial planets. The embryos of the terrestrial planets, the masses of which did not exceed a tenth of the current planetary masses, accumulated planetesimals mainly from the vicinity of their orbits. When planetesimals fell onto the embryos of the terrestrial planets from the feeding zone of Jupiter and Saturn, these embryos had not yet acquired the current masses of the planets, and the material of this zone (including water and volatiles) could be accumulated in the inner layers of the terrestrial planets. The inner layers of each of the terrestrial planets were mainly formed from the material located in the vicinity of the orbit of a certain planet. The outer layers of the Earth and Venus could accumulate the same material for these two planets from different parts of the feeding zone of the terrestrial planets. The Earth and Venus could acquire more than half of their masses in 5 Myr. A relatively rapid growth of the bulk of the Martian mass can be explained by the formation of Mars' embryo (the mass of which is several times less than that of Mars) due to contraction of a rarefied condensation.

30 pages

References in corpus (9)

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• Lunar and Terrestrial Planet Formation in the Grand Tack Scenario
• Embryos grown in the dead zone: Assembling the first protoplanetary cores in low mass self-gravitating circumstellar disks of gas and solids
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• Modeling the Historical Flux of Planetary Impactors
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• Formation of trans-Neptunian satellite systems at the stage of condensations
• Formation of embryos of the Earth and the Moon from the common rarefied condensation and their subsequent growth

Cited by in corpus (8)

• Migration processes in the Solar System and their role in the evolution of the Earth and planets
• Formation of the Earth and Moon: Influence of Small Bodies
• Number of near-Earth objects and formation of lunar craters over the last billion years
• Delivery of icy planetesimals to inner planets in the Proxima Centauri planetary system
• Growth of the Moon due to bodies ejected from the Earth
• Probabilities of collisions of bodies ejected from forming Earth with the terrestrial planets
• Migration of celestial bodies in the Solar system and in several exoplanetary systems
• Exchange of meteorites between the terrestrial planets and the Moon