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

探索从原恒星盘到原行星盘的化学多样性的演变

• 批准号: 23740142
• 负责人: SAKAI Nami
• 金额: $ 2.83万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23740142/
• 关键词: 星形成; 惑星系形成; 星間物質; 星間分子; 電波天文学

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.

现在已经确定，低质量的0类原恒星源显示出显着的化学多样性。在这项研究中，这种多样性的进一步演变向原恒星盘和原行星盘进行了探索。利用Nobeyama 45 m望远镜和IRAM 30 m望远镜对各种I类源进行了谱线巡天观测，TMC-1A被确定为WCCC（暖碳链化学）源的I类类似物，其特征是碳链分子的丰富存在。同时，利用阿尔马（Atacama Large Millimeter/Submillimeter Array）对原型L1527进行了观测，研究了WCCC源的演化。证实了内半径约为100 Au的下落旋转包层中存在碳链分子，但其中碳链分子是缺乏的，这是理解WCCC源化学演化的重要线索。此外，为了探索WCCC现象的起源，还利用德国马克斯-普朗克研究所100米望远镜观测了金牛座分子云中Heiles云2方向CH的大尺度分布。在此结果的基础上，我严格地测试了一种可能性，即母云中恒星形成的短时间尺度是WCCC现象的原因。

项目成果

Chemical Diversity of Low-Mass Star-Forming Cores: Class 0 to Class I

低质量恒星形成核心的化学多样性：0 类到 I 类

• 发表时间: 2012
• 作者: Y. Watanabe;N. Sakai;J.E. Lindberg;J.K. Jorgensen;S. E. Bisschop;and S. Yamamoto;Tatsuya Watanabe;渡辺 達也;坂井南美;Tatsuya Watanabe;坂井南美;渡辺 達也;坂井南美;Tatsuya Watanabe;渡辺 達也;坂井 南美;坂井南美;平田潤;坂井南美;坂井南美;坂井南美;坂井南美
• 通讯作者: 坂井南美

An Unbiased Spectral Line Survey toward R CrA IRS7B in the 345 GHz Window with ASTE

使用 ASTE 在 345 GHz 窗口中对 R CrA IRS7B 进行无偏谱线测量

• DOI: 10.1088/0004-637x/745/2/126
• 发表时间: 2012
• 期刊: Astrophys. J
• 作者: Y. Watanabe;N. Sakai;J.E. Lindberg;J.K. Jorgensen;S. E. Bisschop;and S. Yamamoto
• 通讯作者: and S. Yamamoto

化学の目でみた星形成：星形成の多様性

从化学角度看恒星形成：恒星形成的多样性

• 发表时间: 2011
• 期刊: 日本惑星学会誌
• 作者: Y. Watanabe;N. Sakai;J.E. Lindberg;J.K. Jorgensen;S. E. Bisschop;and S. Yamamoto;Tatsuya Watanabe;渡辺 達也;坂井南美;Tatsuya Watanabe;坂井南美;渡辺 達也;坂井南美;Tatsuya Watanabe;渡辺 達也;坂井 南美
• 通讯作者: 坂井 南美

TENTATIVE DETECTION OF DEUTERATED METHANE TOWARD THE LOW-MASS PROTOSTAR IRAS 04368+2557 IN L1527

• DOI: 10.1088/2041-8205/758/1/l4
• 发表时间: 2012-09
• 期刊: The Astrophysical Journal Letters
• 作者: N. Sakai;Y. Shirley;T. Sakai;T. Hirota;Yoshimasa Watanabe;S. Yamamoto

Distribution of 9 cm CH Emission in Heiles Cloud 2

Heiles Cloud 2 中 9 cm CH 发射的分布

• 发表时间: 2012
• 作者: 森田真布;照屋俊明;大野修;末永聖武;松下正和;坂井南美
• 通讯作者: 坂井南美