2007 Fiscal Year Final Research Report Summary
Heating of Dust Particles and Chondrule Formation Induced by Shock-Waves in Upper Layer of Protoplanetary Disks Generated by X-Ray Flares
| Project/Area Number |
17540211
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 (2006-2007)
University of Tsukuba (2005) |
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Principal Investigator |
NAKAMOTO Taishi Tokyo Institute of Technology, Grad. School of Science and Engineering, Associate Professor (60261757)
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| Project Period (FY) |
2005 – 2007
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| Keywords | chondrule / shock-wave heating / 3D shape / ram pressure / radiation transfer |
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| Research Abstract |
We studied the phenomen that a magnetic bubble caused by X-Ray flare of the central star generates the shock waves at the surface of protoplanetary disks around the central star. And we looked at the characteristics of shock waves to examine if they can heat dust particles in the disk enough to melt them and form chondrules based on the shock-wave heating model for chondrule formation. Especially, we focused on following three points : (1) if such an phenomen may take place, (2) if it occurs what kind of effects they may bring to materials in the disk, and (3) if we can know the presence of the phenomen by making observation astronomically and meteoritically. To approach these problems, we have conducted Magneto-Hydrodynamics (MHD) numerical simulations, radiative transfer numerical simulations, analytic investigations, and so forth.
Our MHD simulations have revealed that shock waves can be formed by the magnetic bubbles associated with X-Ray flares. And some of those shock waves turned
… More
out to be appropriate for chondrule formation and crystallization of dust particles. Namely, (a) dust particles in the disk region closer than 3 AU from the central star can be heated enough, and (b) it is unlikely that dust particle in a region further than about 5 AU are heated by the shock waves because the bubble would not reach that region due to the collimation.
On the other hand, thanks to the detailed simulations, we can now discuss places where dust particles are heated to form chondrules and/or crystallize precisely. And we can discuss the possibility that heated and crystallized dust particles may be incorporated in comets. This discussion implies that crystallized dust particles in observed comets should be transferred from the inner region of the solar system, because the shock wave heating can only take place in a region closer than 5 AU.
Some possible transfer mechanisms of dust particles have been proposed so far, but we need to investigate those mechanisms in detail in the future. Less
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Research Products
(193 results)
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[Journal Article] Cosmological Radiative Transfer Codes Comparison Project I:The Static Density Field Tests2006
Author(s)
Iliev, I. T., Ciardi, B., Alvarez, M. A., Maselli, A., Ferrara A., Gnedin, N. Y., Mellema, G., Nakamoto, T., Norman, M. L., Razoumov, A. O., Rijkhorst, E.-J., Ritzerveld, J., Shapiro, P. R., Susa, H., Umemura, M., and Whalen, D. J.
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Journal Title
Monthly Notices of Royal Astronomical Society 371
Pages: 1057-1086
Description
「研究成果報告書概要(和文)」より
Peer Reviewed
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[Journal Article] Cosmological Radiative Transfer Codes Comparison Project I : The Static Density Field Tests2006
Author(s)
I. T., IIiev, B., Ciardi, M. A., Alvarez, A., Maselli, A., Ferrara, N. Y., Gnedin, G., Mellema, T., Nakamoto, M.L., Norman, A.O., Razoumov, E.J., Rijkhorst, J., Ritzerveld, P.R., Shapiro, H., Susa, M., Umemura, D. J., Whalen
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Journal Title
Monthly Notices of Royal Astronomical Society 371
Pages: 1057-1086
Description
「研究成果報告書概要(欧文)」より
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[Presentation] プロレート宇宙塵の形成2007
Author(s)
土居政雄, 中本泰史
Organizer
地球惑星科学連合大会
Place of Presentation
幕張メッセ,千葉
Year and Date
20070519-24
Description
「研究成果報告書概要(和文)」より
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