| 研究実績の概要 |
We have investigated two topics: terrestrial planet formation and late accretion to the terrestrial planets. Both of these projects have relied on dynamical simulations of planet formation and planetesimals that cross the orbits of the terrestrial planets.
The main results are: 1) we can reproduce the growth timescale of Mars using high-resolution simulations on GPUs (Woo et al., 2021a); 2) the giant planets most likely resided on circular orbits during the first 10 Myr of terrestrial planet formation (Woo et al., 2021b); 3) late accretion to the terrestrial planets is dominated by leftover planetesimals (Brasser et al., 2020); 4) the Moon recorded late accretion from 4.5 Gyr ago or 4.35 Gyr ago, or some time in between. These results mean that the mass in planetesimals was below 0.01 Earth mass; 5) the chronology of impacts onto the Moon and Mars are initially very steep, meaning that the ages of the lunar and martian terrains with the most craters are about 200 million years older than previously thought.
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