کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8138127 1523553 2014 47 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Can large icy moons accrete undifferentiated?
ترجمه فارسی عنوان
آیا قمرهای یخی می توانند بدون تفرق باشند؟
کلمات کلیدی
تاریخچه حرارتی، صعود ماهواره ها، شکل گیری، فرآیندهای تاثیر گذار،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم فضا و نجوم
چکیده انگلیسی
The apparent moments of inertia of Callisto and Titan inferred from gravity data suggest incomplete differentiation of their interior, commonly attributed to slow and cold accretion. To understand whether such large icy moons can really avoid global melting and subsequent differentiation during their accretion, we have developed a 3D numerical model that characterizes the thermal evolution of a satellite growing by multi-impacts, simulating the satellite growth and thermal evolution for a body radius ranging from 100 to 2000 km. The effects of individual impacts (energy deposition, excavation) are simulated and integrated for impactor sizes ranging from a few kilometers to one hundred kilometers, while for smaller impactors, a simplified approach with successive thin uniform layers spreading all over the satellite is considered. Our simulations show that the accretion rate plays only a minor role and that extending the duration of accretion does not significantly limit the increase of the internal temperature. The mass fraction brought by large impactors plays a more crucial role. Our results indicate that a satellite exceeding 2000 km in radius may accrete without experiencing significant melting only if its accretion is dominated by small impactors (
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 237, 15 July 2014, Pages 377-387
نویسندگان
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