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Lunar and terrestrialplanet formation inthe Grand Tackscenario Seth A. JacobsonAlessandro Morbidelli2014 год

Lunar and terrestrial planet formation in the Grand Tack scenario
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Аннотация: We present conclusions from a large number of N-body simulations of the giant impact phase of terrestrial planet formation. We focus on new results obtained from the recently proposed Grand Tack model, which couples the gas-driven migration of giant planets to the accretion of the terrestrial planets. The giant impact phase follows the oligarchic growth phase, which builds a bi-modal mass distribution within the disc of embryos and planetesimals. By varying the ratio of the total mass in the embryo population to the total mass in the planetesimal population and the mass of the individual embryos, we explore how different disc conditions control the final planets. The total mass ratio of embryos to planetesimals controls the timing of the last giant (Moon-forming) impact and its violence. The initial embryo mass sets the size of the lunar impactor and the growth rate of Mars. After comparing our simulated outcomes with the actual orbits of the terrestrial planets (angular momentum deficit, mass concentration) and taking into account independent geochemical constraints on the mass accreted by the Earth after the Moon-forming event and on the time scale for the growth of Mars, we conclude that the protoplanetary disc at the beginning of the giant impact phase must have had most of its mass in Mars-sized embryos and only a small fraction of the total disc mass in the planetesimal population. From this, we infer that the Moon-forming event occurred between approximately 60 and approximately 130 Myr after the formation of the first solids and was caused most likely by an object with a mass similar to that of Mars.
Год издания: 2014
Авторы: Seth A. Jacobson, Alessandro Morbidelli
Издательство: Royal Society
Источник: Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences
Ключевые слова: Astro and Planetary Science, Planetary Science and Exploration, Astrophysics and Star Formation Studies
Другие ссылки: Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences (PDF)
Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
Europe PMC (PubMed Central) (PDF)
Europe PMC (PubMed Central) (HTML)
PubMed Central (HTML)
arXiv (Cornell University) (PDF)
PubMed (HTML)
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