2013 Fiscal Year Final Research Report
Exploring Chemical Evolution from Star Forming Cores to Protoplanetary Disks by Multi-Wavelength Line Survey
| Project/Area Number |
21224002
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| Research Category |
Grant-in-Aid for Scientific Research (S)
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| Allocation Type | Single-year Grants |
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| Research Field |
Astronomy
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| Research Institution | The University of Tokyo |
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Principal Investigator |
YAMAMOTO Satoshi 東京大学, 理学(系)研究科(研究院), 教授 (80182624)
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| Co-Investigator(Kenkyū-buntansha) |
TAKANO Shuro 国立天文台, 野辺山宇宙電波観測所, 助教 (00222084)
MAEZAWA Hiroyuki 大阪府立大学, 理学研究科, 准教授 (00377780)
HIROTA Tomoya 国立天文台, 水沢VLBI 観測所, 助教 (10325764)
SAKAI Takeshi 電気通信大学, 情報理工学(系)研究科, 助教 (20469604)
SAKAI Nami 東京大学, 大学院理学系研究科, 助教 (70533553)
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| Research Collaborator |
SHIINO Tatsuya 東京大学, 大学院理学系研究科, 大学院生
TOKUDOME Tomoya 東京大学, 大学院理学系研究科, 大学院生
SOMA Tatsuya 東京大学, 大学院理学系研究科, 大学院生
INOKUMA Hiroshi 東京大学, 大学院理学系研究科, 大学院生
NISHIMURA Yuri 東京大学, 大学院理学系研究科, 大学院生
OYA Yoko 東京大学, 大学院理学系研究科, 大学院生
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| Project Period (FY) |
2009-05-11 – 2014-03-31
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| Keywords | 電波天文学 / 宇宙物理学 / 星形成 / 惑星起源 / 星間化学 / 超伝導デバイス |
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| Research Abstract |
In this program, chemical evolution associated with formation of protostellar disks around solar-type protostars has been studied with state-of-the-art radio telescopes. Sensitive receivers necessary for this purpose have also been developed and commissioned. The main outcomes are as follows.(1)Chemical diversity in protostellar envelopes has been established by spectral line survey observations.(2)Chemical compositions of grain mantle have been characterized by observing shocked regions caused by interactions between ambient gas and molecular outflows from protostars.(3)With subarcsecond observations with ALMA, the centrifugal barrier of infalling gas toward the protostar has been identified for the first time. Chemical compositions of the gas are found to change drastically at the centrifugal barrier.(4)In the Class I protostar TMC-1A, an asymmetric distribution of molecules, which is probably a remnant of the envelope, has been identifed.
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[Journal Article] Change in the Chemical Composition of Infalling Gas Forming a Disk around a Protostar2014
Author(s)
N. Sakai, T. Sakai, T. Hirota, Y. Watanabe, C. Ceccarelli, C. Kahane, S. Bottinelli, E. Caux, K, Demyk, C. Vastel, A. Coutens, V. Taquet, N. Ohashi, S. Takakuwa, H.-W. Yen, Y. Aikawa, and S.Yamamoto
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Journal Title
Nature
Volume: 507
Pages: 78-80
DOI
Peer Reviewed
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[Journal Article] A Recent Accretion Burst in the Low-mass Protostar IRAS 15398-3359 : ALMA Imaging of Its Related Chemistry2013
Author(s)
J.K. Jorgensen, R. Visser, N. Sakai, E. Bergin, C. Brinch, D. Harsono, J.E. Lindberg, E.F. van Dishoeck, S. Yamamoto, S. Bisschop, and M.V. Persson
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Journal Title
ApJ
Volume: 779
Pages: L22(4)
DOI
Peer Reviewed
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[Journal Article] The 3 mm Spectral Line Survey toward the L1157 B1 Shocked Region : I. Data2012
Author(s)
T. Yamaguchi, S.Takano, Y. Watanabe, N. Sakai, T. Sakai, S.-Y. Liu, Y.-N. Su, N. Hirano, S. Takakuwa, Y.Aikawa, H. Nomura, and S. Yamamoto
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Journal Title
Publ. Astron. Soc. Japan
Volume: 64
Pages: 105(45)
DOI
Peer Reviewed
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[Journal Article] Detection of Phosphrous Nitride in the Lynds 1157 B1 Shocked Region2011
Author(s)
T. Yamaguchi, S.Takano, Y. Watanabe, N. Sakai, T. Sakai, S.-Y. Liu, Y.-N. Su, N. Hirano, S. Takakuwa, Y.Aikawa, H. Nomura, and S. Yamamoto
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Journal Title
Publ. Astron. Soc. Japan
Volume: 63
Pages: L37-L41
DOI
Peer Reviewed
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[Journal Article] Early Results of the 3 mm Spectral Line Survey toward the Lynds 1157 B1 Shocked Region2011
Author(s)
M. Sugimura, T. Yamaguchi, T. Sakai, T. Umemoto, N. Sakai, S. Takano, Y. Aikawa, N. Hirano, S.-Y. Liu, T.J. Millar, H. Nomura, Y.-N. Su, S. Takakuwa, and S. Yamamoto
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Journal Title
Publ. Astron. Soc. Japan
Volume: 63
Pages: 459-472
DOI
Peer Reviewed
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