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• W2895923020 abstract "ABSTRACT We investigate planetesimal accretion via a direct N-body simulation of an annulus at 1 au orbiting a 1 M$odot$ star. The planetesimal ring, which initially contains N = 106 bodies is evolved into the oligarchic growth phase. Unlike previous lower resolution studies, we find that the mass distribution of planetesimals develops a bump at intermediate mass after the oligarchs form. This feature marks a boundary between growth modes. The smallest planetesimals are packed tightly enough together to populate mean motion resonances with the oligarchs, which heats the small bodies, enhancing their growth. If we depopulate most of the resonances by decreasing the width of the annulus, this effect becomes weaker. To clearly demonstrate the dynamics driving these growth modes, we also examine the evolution of a planetary embryo embedded in an annulus of collisionless planetesimals. In this case, we find that the resonances push planetesimals away from the embryo, decreasing the surface density of the bodies adjacent to the embryo. This effect only occurs when the annulus is wide enough and the mass resolution of the planetesimals is fine enough to populate the resonances. The bump we observe in the mass distribution resembles the 100 km power-law break seen in the size distribution of asteroid belt objects. Although the bump produced in our simulations occurs at a size larger than 100 km, we show that the bump location is sensitive to the initial planetesimal mass, which implies that this feature is potentially useful for constraining planetesimal formation models." @default.
• W2895923020 created "2018-10-26" @default.
• W2895923020 creator A5003918379 @default.
• W2895923020 creator A5012372013 @default.
• W2895923020 date "2019-08-19" @default.
• W2895923020 modified "2023-09-27" @default.
• W2895923020 title "N-body simulations of terrestrial planet growth with resonant dynamical friction" @default.
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• W2895923020 doi "https://doi.org/10.1093/mnras/stz2284" @default.
• W2895923020 hasPublicationYear "2019" @default.
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