DOI: 10.1002/2015GL065361
论文题名: The meteoroid stream of comet Encke at Mercury: Implications for MErcury Surface, Space ENvironment, GEochemistry, and Ranging observations of the exosphere
作者: Christou A.A. ; Killen R.M. ; Burger M.H.
刊名: Geophysical Research Letters
ISSN: 0094-9578
EISSN: 1944-9309
出版年: 2015
卷: 42, 期: 18 起始页码: 7311
结束页码: 7318
语种: 英语
英文关键词: comets, dynamics
; Mercury, atmospheres
Scopus关键词: Calcium
; Direct injection
; Dust
; Ionosphere
; Dynamical evolution
; Emission mechanism
; MErcury Surface
; Mercury's exosphere
; Poynting-Robertson drag
; Space environment
; Surface adsorption
; Mercury (metal)
; comet
; geochemistry
; hypothesis testing
; Mercury (planet)
; meteor
; planetary atmosphere
英文摘要: We test the hypothesis that an annually repeatable Ca emission excess in Mercury's exosphere at a True Anomaly Angle (TAA) of 25° ± 5° is due to particles from comet 2P/Encke impacting the surface. By simulating the dynamical evolution of Encke particles under planetary perturbations and Poynting-Robertson drag, we find that millimeter-sized grains ejected 1-2 ×104 years ago encounter Mercury at TAA = 350°-30°. The timing of the excess emission is consistent with a major dust release episode 20 kyr ago, possibly due to Encke progenitor breakup. The emission mechanism is likely the direct injection of impact-liberated Ca into sunlight rather than nightside surface adsorption for subsequent release at dawn. The timing of dust release from the comet depends on this mechanism; a 10 kyr age is implied by the direct-injection scenario. © 2015 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945470042&doi=10.1002%2f2015GL065361&partnerID=40&md5=70cfd8f1a08c62fb43c50ffeb239594b
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9193
Appears in Collections: 科学计划与规划 气候变化与战略
There are no files associated with this item.
作者单位: Armagh Observatory, College Hill, Armagh, United Kingdom
Recommended Citation:
Christou A.A.,Killen R.M.,Burger M.H.. The meteoroid stream of comet Encke at Mercury: Implications for MErcury Surface, Space ENvironment, GEochemistry, and Ranging observations of the exosphere[J]. Geophysical Research Letters,2015-01-01,42(18).