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2012 Fiscal Year Final Research Report

Exploring an Evolution of Chemical Diversity from Protostellar disks to Protoplanetary disks

Research Project

  • PDF
Project/Area Number 23740142
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Astronomy
Research InstitutionThe University of Tokyo

Principal Investigator

SAKAI Nami  東京大学, 大学院・理学系研究科, 助教 (70533553)

Project Period (FY) 2011 – 2012
Keywords星形成 / 惑星系形成 / 星間物質 / 星間分子
Research Abstract

It is now established that low-mass Class 0 protostellar sources show significant chemical diversity. In this study, further evolution of such diversity toward protostellar disks and protoplanetary disks has been explored. Spectral line survey observations have been conducted toward various Class I sources with the Nobeyama 45 m telescope and the IRAM30 m telescope, and TMC-1A has been identified as a Class I analog of the WCCC (warm carbon chain chemistry) source which is characterized by rich existence of carbon-chain molecules. In parallel, the evolution of the WCCC source has been studied by observing its prototype, L1527, with high spatial resolution of 1” or better by using ALMA (Atacama Large Millimeter/submillimeter Array). Carbon-chain molecules are confirmed to exist inan infalling rotating envelope whose inner radius is about 100 AU, although they are deficient within it. This is an important clue to an understanding chemical evolution of the WCCC sources. Furthermore, large scale distribution of CH has been observed toward Heiles Cloud 2 in the Taurus molecular cloud by using the Max Planck Institute 100 m telescope in Germany in order to explore an origin of the WCCC phenomenon. On the basis of the result, I have critically tested a possibility that short timescale of star-formation in a parent cloud is responsible for the WCCC phenomenon.

  • Research Products

    (11 results)

All 2013 2012 2011

All Journal Article (6 results) (of which Peer Reviewed: 4 results) Presentation (5 results)

  • [Journal Article] CH Radio Emission from Heiles Cloud 2 As a Tracer of Molecular2012

    • Author(s)
      坂井南美
    • Journal Title

      Astronomy and Astrophysics

      Volume: 546 Pages: A103(8pp)

    • DOI

      DOI:10.1051/0004-6361/201219106

    • Peer Reviewed
  • [Journal Article] Distribution of CH3OH in NGC1333 IRAS4B2012

    • Author(s)
      坂井南美
    • Journal Title

      Astrophysical Journal

      Volume: 754 Pages: 70(8pp)

    • DOI

      DOI:10.1088/0004-637X/754/1/70

    • Peer Reviewed
  • [Journal Article] Tentative Detection of Deuterated Methane toward the Low Mass Protostar IRAS 04368+2557 in L15272012

    • Author(s)
      坂井南美
    • Journal Title

      Astrophysical Journal

      Volume: 758 Pages: L4(4pp)

    • Peer Reviewed
  • [Journal Article] Observations of Complex Molecules in Low-Mass Protostars2011

    • Author(s)
      坂井南美
    • Journal Title

      Proceedings IAU Symposium

      Volume: 280 Pages: 43-52

    • DOI

      DOI:10.1017/S1743921311024859

  • [Journal Article] Peculiar Carbon-Chain Chemistry in Low-Mass Star Forming Regions2011

    • Author(s)
      坂井南美
    • Journal Title

      EAS Publication Series

      Volume: 52 Pages: 235-238

    • URL

      http://dx.doi.org/10.1051/eas/1152038

  • [Journal Article] 化学の目でみた星形成:星形成の多様性2011

    • Author(s)
      坂井南美
    • Journal Title

      日本惑星学会誌

      Volume: 20 Pages: 1

    • Peer Reviewed
  • [Presentation] Tentative Detection of Deuterated Methane toward Low-Mass Protostar IRAS 04368+2557 in L15272013

    • Author(s)
      坂井南美
    • Organizer
      日本天文学会2013年春季大会
    • Place of Presentation
      埼玉大学
    • Year and Date
      2013-03-21
  • [Presentation] Chemical Diversity of Low-MassStar-Forming Cores: Class 0 to Class I2012

    • Author(s)
      坂井南美
    • Organizer
      New Trends in Radio Astronomy in the ALMA Era
    • Place of Presentation
      ザ・プリンス箱根
    • Year and Date
      2012-12-05
  • [Presentation] Distribution of 9 cm CH Emission in Heiles Cloud 22012

    • Author(s)
      坂井南美
    • Organizer
      日本天文学会2012年春季年会
    • Place of Presentation
      龍谷大学・深草キャンパス
    • Year and Date
      2012-03-20
  • [Presentation] Observations of ComplexMolecules in Low-Mass Protostars2011

    • Author(s)
      坂井南美
    • Organizer
      IAU Symposium No. 280
    • Place of Presentation
      Toledo, Spain
    • Year and Date
      20110500
  • [Presentation] 低質量星形成領域 L1527 における炭素鎖分子の高分解能観測2011

    • Author(s)
      坂井南美
    • Organizer
      日本天文学会2011年秋季年会
    • Place of Presentation
      鹿児島 大学・郡元キャンパス
    • Year and Date
      2011-09-20

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Published: 2014-09-25  

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