2006 Fiscal Year Final Research Report Summary
Dust settling and growth in protoplanetary disks and its implication for formation of extrasolar planets
| Project/Area Number |
16340054
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
IDA Shigeru Tokyo Institute of Technology, Graduate School of Science and Engineering, Professor, 大学院理工学研究科, 教授 (60211736)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Hidekazu Hokkaido University, Institute of Low Temperature Scienceh, Associate Professor, 低温科学研究所, 助教授 (00282814)
KITAMURA Yoshimi Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, Associate Professor, 宇宙科学研究本部, 助教授 (30183792)
KOKUBO Eiichiro National Astronomical Observatory of Japan, Associate Professor, 理論天文系, 助教授 (90332163)
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| Project Period (FY) |
2004 – 2006
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| Keywords | extrasolar planets / protoplanetary / dust / planet formation / numerial simulation |
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| Research Abstract |
Planetary systems are formed in protoplanetary disks that are by-products of star formation. The disks consist of 98-99 wt.% of H-He gas and residual dust grains. The dust coagulates into planetesimals and the planetesimals accrete into terrestria planets and cores of jovian planets.
In this study, we investigated details of processes from dust to planetesimals. Collisions between dust grains do not necessarily result in coalescence. The conditions for coalescence of disruption were derived by numerical simulations (Wada et al. 2007). Self-gravitational instability of dust to clumps (planetesimals) was also studied by N-body simulations (Michikoshi et al. 2007). On the other hands, assuming complete sticking of dust collisions, we simulated evolution of dust size distributions as functions of radius and height of disks to calculate dust radiation from the disks and compare the results with observational data (Tanaka et al. 2005). We found that dust radiation decays on timescales of million years by growth of dust, wchich means that the decay does not necessarily imply depletion of disk gas.
We also discussed implication for radio observation. With the theoretical model, we found that "AKARI" space telescope can detect dust components of disks down to Moon mass and fixed the survey project based on it. We also developed pipelines for star/planet formation study with IDL. Furthermore, we found that high-precision images by ALMA can detect difference in dust growth between inner and outer disks.
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[Journal Article] Numerical Simulation of Dust Aggregate Collisions. I. Compression and Disruption of Two-Dimensional Aggregates,2007
Author(s)
Wada, K., Tanaka, H., Suyama, T., Kimura, H., Yamamoto, T.
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Journal Title
Astrophysical Journal 661
Pages: 320-333
Description
「研究成果報告書概要(欧文)」より
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