Timescale of asteroid resurfacing by regolith convection resulting from the impact-induced global seismic shaking

Abstract

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 $\eta$, 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.

14pages, 8figures

References in corpus (3)

• The Brazil-nut effect and its application to asteroids
• Micro-meteoroid seismic uplift and regolith concentration on kilometric scale asteroids
• Scaling of convective velocity in a vertically vibrated granular bed

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• Propagation and attenuation of pulses driven by low velocity normal impacts in granular media
• Estimation of space weathering timescale on (25143) Itokawa: Implications on its rejuvenation process
• Relaxation Dynamics of a Granular Pile on a Vertically-Vibrating Plate
• Resurfacing processes constrained by crater distribution on Ryugu
• Boulder Stranding in Ejecta Launched by an Impact Generated Seismic Pulse
• Centroid migration on an impacted granular slope due to asymmetric ejecta deposition and landsliding