Physical and Chemical Diversity of Star-Forming Regions and Its Propagation to Protoplanetary Disks

恒星形成区域的物理和化学多样性及其向原行星盘的传播

• 批准号: 21740132
• 负责人: SAKAI Nami
• 金额: $ 2.91万
• 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: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21740132/
• 关键词: 電波天文学; 星・惑星系形成; 星間物質

Recently, it is recognized that the low-mass Class 0 sources shows significant chemical diversity. In this study, we have focused on one extreme case showing extraordinary richness of carbon-chain molecules in a lukewarm region near the protostar (Warm Carbon-Chain Chemistry ; WCCC), and have observationally studied its origin and its evolution toward the Class I stage. The followings are major outcomes. First, we have newly found a young starless core with rich carbon-chain molecules, Lupus-1A, near the WCCC source IRAS15398-3359. The other WCCC source, L1527, is also located near the similar young starless core TMC-1. This result further supports our scenario that the WCCC originates from fast contraction of the parent core. Second, we have studied high-resolution distributions of carbon-chain molecules in L1527 with PdBI. Compact distributions of carbon-chain molecules support the WCCC mechanism triggered by the evaporation of CH_4 near the protostar. More importantly, carbon-chain molecules are found to reside even in the gas infalling to the protostar, suggesting that carbon-chain molecules will be brought into protoplanetary disks. We have searched for the Class 1 sources with the WCCC activities, and have indeed found such an example near L1527. In this study, we have obtained novel information on how the WCCC sources will be evolved toward protoplanetary disks.

最近，人们认识到低质量 0 级源表现出显着的化学多样性。在这项研究中，我们重点研究了一个极端案例，显示出原恒星附近的温热区域碳链分子异常丰富（温碳链化学；WCCC），并观察性地研究了其起源及其向 I 类阶段的演化。 。主要成果如下。首先，我们在WCCC源IRAS15398-3359附近新发现了一个具有丰富碳链分子的年轻无星核心Lupus-1A。另一个 WCCC 源 L1527 也位于类似的年轻无星核心 TMC-1 附近。这一结果进一步支持了我们的假设，即 WCCC 源于母核的快速收缩。其次，我们用 PdBI 研究了 L1527 中碳链分子的高分辨率分布。碳链分子的紧凑分布支持了原恒星附近 CH_4 蒸发引发的 WCCC 机制。更重要的是，碳链分子甚至被发现存在于落入原恒星的气体中，这表明碳链分子将被带入原行星盘。我们通过WCCC活动搜索了1类源，确实在L1527附近找到了这样的例子。在这项研究中，我们获得了关于 WCCC 源如何演化为原行星盘的新信息。

项目成果

Chemical Diversity of Low-Mass Star Forming Regions

低质量恒星形成区域的化学多样性

• 发表时间: 2010
• 作者: Himiyama;Y.;Y.Shiratori;S.Higuchi;J. Russo and H. Tanaka;Y.Giga;N.Sakai
• 通讯作者: N.Sakai