2019
DOI: 10.1029/2018je005756
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Impact Ejecta and Gardening in the Lunar Polar Regions

Abstract: The Moon is continually bombarded by interplanetary meteoroids. While many of the meteoroid sources are near the ecliptic plane, a significant population of high‐inclination meteoroids exists at 1 au that bombards the lunar polar regions. Building on previous measurements of the response of the lunar impact ejecta cloud to known meteoroid sources, we develop an ejecta model for the entire lunar surface by incorporating the high‐inclination sources. We find that the polar regions of the Moon experience similar … Show more

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Cited by 26 publications
(32 citation statements)
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“…More detailed analysis of the impact ejecta emission cone indicates that the grains are released in a 10°cone (Bernardoni et al, 2019;Szalay et al, 2019), and thus, grains with speeds up to 305 m/s would have a range <20 km and remain in the crater, corresponding to about 13 % of the total particulate ejecta produced by the impact. Figure 1 compares the various surface emission rates as a function of temperature.…”
Section: Micrometeoroid Release Of Icy Grainsmentioning
confidence: 99%
“…More detailed analysis of the impact ejecta emission cone indicates that the grains are released in a 10°cone (Bernardoni et al, 2019;Szalay et al, 2019), and thus, grains with speeds up to 305 m/s would have a range <20 km and remain in the crater, corresponding to about 13 % of the total particulate ejecta produced by the impact. Figure 1 compares the various surface emission rates as a function of temperature.…”
Section: Micrometeoroid Release Of Icy Grainsmentioning
confidence: 99%
“…; Szalay et al. 2019b). Therefore, a harder asteroidal surface could produce significantly higher ejecta yields than the Moon's regolith surface, from which these predictions were derived.…”
Section: Discussionmentioning
confidence: 97%
“…Recently-visited asteroids Bennu and Ryugu have an overall larger grain size and more exposed hard surfaces than the Moon's regolith (Lauretta et al, 2019;Watanabe et al, 2019). Impact ejecta observations and comparison to impactor models suggest that the Moon's fine regolith surface may have a lower yield than an equivalent solid surface of the same material, where a larger fraction of impact energy may get partitioned to local heating of the regolith instead of into the kinetic energy of ballistic ejecta (Szalay et al, 2019b, Pokorny et al, 2019. Therefore, a harder asteroidal surface could produce significantly higher ejecta yields than the Moon's regolith surface, from which these predictions were derived.…”
Section: Development Of Dust Clouds Around Asteroidsmentioning
confidence: 99%
“…Specifically, the ongoing rates of plasma sputtering and meteoric impact vaporization and ejection on the Moon suggest that the ice present at the surface or near‐surface of regolith particles (as sensed by LAMP to a depth of <1 μm) must be <2,000 years old (Farrell et al, 2019). Relatively young surface ice can be delivered to the Moon from micrometeorite bombardment (Ong et al, 2010; Pokorný et al, 2019; Szalay et al, 2019) or formed in situ from the ongoing interactions between solar wind protons and oxygen in the lunar regolith (e.g., Crider & Vondrak, 2000; Dyar et al, 2010). Ice delivered during the Eratosthenian or Copernican eras is not predicted to be volcanic in origin, given that the bulk of lunar volcanism occurred prior to these eras (e.g., Needham & Kring, 2017).…”
Section: The Age Of Lunar Surface Icementioning
confidence: 99%