Jetting during oblique impacts of spherical impactors

被引:13
|
作者
Wakita, Shigeru [1 ,4 ]
Johnson, Brandon C. [1 ,2 ]
Denton, C. Adeene [1 ]
Davison, Thomas M. [3 ]
机构
[1] Purdue Univ, Dept Earth Atmospher & Planetary Sci, W Lafayette, IN 47907 USA
[2] Purdue Univ, Dept Phys & Astron, W Lafayette, IN 47907 USA
[3] Imperial Coll London, Dept Earth Sci & Engn, London, England
[4] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA
关键词
Impact processes; Collisional physics; Asteroids;
D O I
10.1016/j.icarus.2021.114365
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
During the early stages of an impact a small amount material may be jetted and ejected at speeds exceeding the impact velocity. Jetting is an important process for producing melt during relatively low velocity impacts. How impact angle affects the jetting process has yet to be fully understood. Here, we simulate jetting during oblique impacts using the iSALE shock physics code. Assuming both the target and impactor have the same composition (dunite), we examine the jetted material which exceeds the impact velocity. Our results show that oblique impacts always produce more jetted ejecta than vertical impacts, except for grazing impacts with impact angles <15 degrees. A 45 degrees impact with an impact velocity of 3 km/s produces jetted material equal to similar to 7% of the impactor mass. This is 6 times the jetted mass produced by a vertical impact with similar impact conditions. We also find that the origin of jetted ejecta depends on impact angle; for impact angles less than 45 degrees, most of the jet is composed of impactor material, while at higher impact angles the jet is dominated by target material. Our findings are consistent with previous experimental work. In all cases, jetted materials are preferentially distributed downrange of the impactor.
引用
收藏
页数:13
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