کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5487332 | 1666393 | 2017 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Onset of oligarchic growth and implication for accretion histories of dwarf planets
ترجمه فارسی عنوان
آغاز رشد و تکوین الیگارشی و پیامدهای آن برای تاریخهای تکامل سیارات کوتوله
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کلمات کلیدی
صعود شکل گیری سیاره، اصل و نسب، منظومه شمسی، سیارک ها، کمربند کوئیپر،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علوم فضا و نجوم
چکیده انگلیسی
We investigate planetary accretion that starts from equal-mass planetesimals using an analytic theory and numerical simulations. We particularly focus on how the planetary mass Moli at the onset of oligarchic growth depends on the initial mass m0 of a planetesimal. Oligarchic growth commences when the velocity dispersion relative to the Hill velocity of the protoplanet takes its minimum. We find that if m0 is small enough, this normalized velocity dispersion becomes as low as unity during the intermediate stage between the runaway and oligarchic growth stages. In this case, Moli is independent of m0. If m0 is large, on the other hand, oligarchic growth commences directly after runaway growth, and Moliâm03/7. The planetary mass Moli for the solid surface density of the Minimum Mass Solar Nebula is close to the masses of the dwarf planets in a reasonable range of m0. This indicates that they are likely to be the largest remnant planetesimals that failed to become planets. The power-law exponent q of the differential mass distribution of remnant planetesimals is typically â2.0 and â2.7 to â2.5 for small and large m0. The slope, qââ2.7, and the bump at 1021 g (or 50 km in radius) for the mass distribution of hot Kuiper belt objects are reproduced if m0 is the bump mass. On the other hand, small initial planetesimals with m0 â¼ 1013 g or less are favored to explain the slope of large asteroids, qââ2.0, while the bump at 1021 g can be reproduced by introducing a small number of asteroid seeds each with mass of 1019 g.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 281, 1 January 2017, Pages 459-475
Journal: Icarus - Volume 281, 1 January 2017, Pages 459-475
نویسندگان
Ryuji Morishima,