DOI: 10.1002/2015GL065601
论文题名: Predictions for impactor contamination on Ceres based on hypervelocity impact experiments
作者: Daly R.T. ; Schultz P.H.
刊名: Geophysical Research Letters
ISSN: 0094-8576
EISSN: 1944-8307
出版年: 2015
卷: 42, 期: 19 起始页码: 7890
结束页码: 7898
语种: 英语
英文关键词: Ceres
; dark material
; impactor contamination
; meteorite infall
; meteoritic debris
; projectile component
Scopus关键词: Contamination
; Debris
; Meteorites
; Projectiles
; Silicates
; Asteroid belt
; Ceres
; High resolution image
; Hypervelocity impacts
; Ice content
; Impact experiment
; Impactors
; Near surfaces
; Ice
; accretion
; asteroid
; debris flow
; experimental study
; impact
; meteorite
; pollutant source
; prediction
; regolith
; silicate
; survival
; Ceres
英文摘要: New experiments predict that Ceres should be extensively contaminated with meteoritic debris derived from the asteroid belt. All types of impactors likely contribute to the contamination. Ceres may accrete debris more efficiently if it is ice-rich because of enhanced projectile survival and retention in porous ice targets. Experiments indicate that if a silicate regolith lag protects subsurface ice, then some of the projectile should be injected into the regolith during high-angle impacts, thereby hiding part of the projectile component from view. If impacts excavate ice, sublimation will gradually concentrate projectile relics into a surficial lag. In contrast, if the near-surface lacks ice, then accreted meteoritic debris should be distributed throughout a vertically mixed regolith. High-resolution images may reveal pristine projectile relics lining some crater floors. Moreover, we predict that the surface of Ceres is not exclusively endogenic and may be dominated by delivered exogenic debris. Key Points Impact experiments reveal how efficiently icy targets retain impactors Ice content of Ceres will change extent and expression of projectile component Ceres is likely heavily contaminated by all types of impactors © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946950147&doi=10.1002%2f2015GL065601&partnerID=40&md5=de712ffcf5ac638a75df581db228c08d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8192
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Earth, Environmental and Planetary Sciences, Brown University, Providence, RI, United States
Recommended Citation:
Daly R.T.,Schultz P.H.. Predictions for impactor contamination on Ceres based on hypervelocity impact experiments[J]. Geophysical Research Letters,2015-01-01,42(19).