Jetting during oblique impacts of spherical impactors
| Autor: | Brandon C. Johnson, Thomas M. Davison, C. Adeene Denton, Shigeru Wakita |
|---|---|
| Přispěvatelé: | Science and Technology Facilities Council (STFC) |
| Rok vydání: | 2021 |
| Předmět: |
010504 meteorology & atmospheric sciences
Collisional physics Astrophysics::High Energy Astrophysical Phenomena Impact angle FOS: Physical sciences 0404 Geophysics Astronomy & Astrophysics 01 natural sciences Impact velocity 0201 Astronomical and Space Sciences 0103 physical sciences 0402 Geochemistry Experimental work Ejecta 010303 astronomy & astrophysics 0105 earth and related environmental sciences Earth and Planetary Astrophysics (astro-ph.EP) High Energy Astrophysical Phenomena (astro-ph.HE) Jet (fluid) Science & Technology Impact processes Oblique case Astronomy and Astrophysics Mechanics Asteroids Space and Planetary Science Physical Sciences Shock physics High Energy Physics::Experiment Astrophysics - High Energy Astrophysical Phenomena Geology Astrophysics - Earth and Planetary Astrophysics |
| DOI: | 10.48550/arxiv.2102.02303 |
| Popis: | 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 $< 15^{\circ}$. A 45$^{\circ}$ impact with an impact velocity of 3 km/s produces jetted material equal to $\sim$ 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$^{\circ}$, 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. 34 pages, 15 figures, accepted for publication in Icarus |
| Databáze: | OpenAIRE |
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