Publicly Offered Research
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
Q1: How much water did the terrestrial planets accrete?Q2: What is the frequency of giant impacts on Venus?Q3: What is the expected isotopic bulk composition for Earth and Mars from the different models?Q4: What is the isotopic composition of water and the noble gases on these planets?
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.
令和2年度が最終年度であるため、記入しない。
All 2021 2020 2019
All Journal Article (5 results) (of which Int'l Joint Research: 5 results, Peer Reviewed: 4 results, Open Access: 1 results) Presentation (2 results) (of which Int'l Joint Research: 2 results)
Icarus
Volume: 359 Pages: 1-24
10.1016/j.icarus.2021.114305
The Astrophysical Journal Letters
Volume: 910 Issue: 2 Pages: 1-5
10.3847/2041-8213/abed56
Volume: 361 Pages: 1-16
10.1016/j.icarus.2021.114389
Volume: 338 Pages: 1-23
10.1016/j.icarus.2019.113514
Nature Astronomy
Volume: - Issue: 5 Pages: 1-4
10.1038/s41550-019-0978-6
