71 citations · 126 across the 11 of their papers we have counts for
12 papers
Formation of Ryugu's parent planetesimal beyond the CO snow line from small pebbles: insights from thermal evolution modeling
Sota Arakawa, Hidenori Genda, Noriyuki Kawasaki +3
Astronomical observations of planet-forming circumstellar disks indicate that planetesimals form from 0.1-mm- to 1-cm-sized dust aggregates, commonly called ``pebbles.'' When such…
Effect of lunar rotation on antipodal ejecta deposition
Shigeru Wakita, Brandon C. Johnson
The Moon's crust exhibits strong magnetic anomalies that likely record ancient magnetic fields produced by a core dynamo. Lunar materials have low magnetic susceptibility, but impa…
Chondrite Parent Bodies as Escaped Satellites of Proto-Planetary Embryos
Harold F. Levison, Rogerio Deienno, Kevin J. Walsh +4
Chondrites are composed of formerly partially molten material, known as chondrules, surrounded by fine-grained matrix. They date from the earliest times in Solar System history. Ho…
Numerical Simulations of Hypervelocity Micrometeoroid Impacts: Rocky Impactors onto Icy Targets and the Role of Porosity
Ryuki Hyodo, Shigeru Wakita, Brandon C. Johnson
In the outer Solar System, for example in the Saturnian system, a planet's strong gravity attracts micrometeoroids and generates hypervelocity impacts on bodies such as rings and s…
A youthful Titan implied by improved impact simulations
Shigeru Wakita, Brandon C. Johnson, Jason M. Soderblom +1
The small number of impact craters found on Titan suggests that its surface is relatively young. Previous work estimated its surface age to be between 200 and 1000 Myr. This estima…
Impacts into Titan's methane-clathrate crust as a source of atmospheric methane
Shigeru Wakita, Brandon C. Johnson, Jason M. Soderblom +5
Titan is the only icy satellite in the solar system with a dense atmosphere. This atmosphere is composed primarily of nitrogen with a few percent methane, which supports an active,…
Chondrule survivability in the solar nebula
Tetsuo Taki, Shigeru Wakita
The lifetime of mm size dust grains, such as chondrules, in the nominal solar nebula model is limited to yr due to an inward drift driven by gas drag. However, isotop…
Survivability of Amorphous Ice in Comets Depends on the Latent Heat of Crystallization of Impure Water Ice
Sota Arakawa, Shigeru Wakita
Comets would have amorphous ice rather than crystalline one at the epoch of their accretion. Cometary ice contains some impurities that govern the latent heat of ice crystallizatio…
Modeling the formation of Selk impact crater on Titan: Implications for Dragonfly
Shigeru Wakita, Brandon C. Johnson, Jason M. Soderblom +3
Selk crater is an 80 km diameter impact crater on the Saturnian icy satellite, Titan. Melt pools associated with impact craters like Selk provide environments where liquid w…
Methane-saturated layers limit the observability of impact craters on Titan
Shigeru Wakita, Brandon C. Johnson, Jason M. Soderblom +2
As the only icy satellite with a thick atmosphere and liquids on its surface, Titan represents a unique end-member to study the impact cratering process. Unlike craters on other Sa…
Enhancement of impact heating in pressure-strengthened rocks in oblique impacts
Shigeru Wakita, Hidenori Genda, Kosuke Kurosawa +1
Shock-induced metamorphism in meteorites informs us about the collisional environment and history of our solar system. Recently the importance of material strength in impact heatin…
Thermal and Impact History of the H Chondrite Parent Asteroid during Metamorphism: Constraints from Metallic Fe-Ni
Edward R. D. Scott, Tatiana V. Krot, Joseph I. Goldstein +1
We have studied cloudy taenite, metallographic cooling rates, and shock effects in 30 H3-6 chondrites to elucidate the thermal and early impact history of the H chondrite parent bo…