کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8135276 1523518 2016 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Timescale of asteroid resurfacing by regolith convection resulting from the impact-induced global seismic shaking
ترجمه فارسی عنوان
مدت زمان شارژ سیارک توسط جابجایی رگولیت به علت تکان دادن لرزه های جهانی ناشی از تاثیر
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم فضا و نجوم
چکیده انگلیسی
A model for the asteroid resurfacing by regolith convection is built to estimate its timescale. In the model, regolith convection is driven by the impact-induced global seismic shaking. The model consists of three steps: (i) intermittent impact of meteoroids, (ii) impact-induced global vibration (seismic shaking), and (iii) vibration-induced regolith convection. In order to assess the feasibility of the resurfacing process driven by regolith convection, we estimate the resurfacing timescale as a function of the size of a target asteroid. In the estimate, a set of parameter values is assumed on the basis of previous works. However, some of them (e.g., seismic quality factor Q, seismic efficiency η, and seismic frequency f) are very uncertain. Although these parameter values might depend on asteroid size, we employ the standard values to estimate the representative behavior. To clarify the parameter dependences, we develop an approximated scaling form for the resurfacing timescale. According to the estimated result, we find that the regolith-convection-based resurfacing timescale is shorter than the mean collisional lifetime in most of the parameter uncertainty ranges. These parameter ranges are within those reported by previous works for small asteroids. This means that the regolith convection can be a possible mechanism for the asteroid resurfacing process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Icarus - Volume 272, 1 July 2016, Pages 165-177
نویسندگان
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