論文

査読有り
2021年6月

Erosion and Accretion by Cratering Impacts on Rocky and Icy Bodies

ASTROPHYSICAL JOURNAL
  • Ryuki Hyodo
  • ,
  • Hidenori Genda

913
2
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.3847/1538-4357/abf6d8
出版者・発行元
IOP PUBLISHING LTD

During planet formation, numerous small impacting bodies result in cratering impacts on large target bodies. A fraction of the target surface is eroded, while a fraction of the impactor material accretes onto the surface. These fractions depend upon the impact velocities, the impact angles, and the escape velocities of the target. This study uses smoothed particle hydrodynamics simulations to model cratering impacts onto a planar icy target for which gravity is the dominant force and material strength is neglected. By evaluating numerical results, scaling laws are derived for the escape mass of the target material and the accretion mass of the impactor material onto the target surface. Together with recently derived results for rocky bodies in a companion study, a conclusion is formulated that typical cratering impacts on terrestrial planets, except for those on Mercury, led to a net accretion, while those on the moons of giant planets, e.g., Rhea and Europa, led to a net erosion. Our newly derived scaling laws would be useful for predicting the erosion of the target body and the accretion of the impactor for a variety of cratering impacts that would occur on large rocky and icy planetary bodies during planet formation and collisional evolution from ancient times to today.


リンク情報
DOI
https://doi.org/10.3847/1538-4357/abf6d8
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000655323400001&DestApp=WOS_CPL
ID情報
  • DOI : 10.3847/1538-4357/abf6d8
  • ISSN : 0004-637X
  • eISSN : 1538-4357
  • Web of Science ID : WOS:000655323400001

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