AB Aur星周盘的分子含量：首次在星周盘中探测到SO
Molecular content of the circumstellar disk in AB Aur: First detection of SO in a circumstellar disk
摘要：
在围绕年轻恒星的星周盘中，已经发现了非常少的分子种类。我们正在进行一项观测研究的化学拱盘周围的金牛座T和赫比格Ae恒星。本说明介绍了这项研究的初步结果。我们使用最近安装在IRAM 30米望远镜上的EMIR接收器对AB Aur，DM Tau和LkCa 15周围的圆盘中的分子线进行了灵敏的搜索。我们检测到HCO+，CN，H2 CO，SO，CS和HCN分子向AB Aur的谱线。此外，我们初步检测到DCO+和H2S线。谱线轮廓表明，CN，HCN，H_2CO，CS和SO线出现在磁盘。这使它成为第一次在拱星盘中探测到SO。我们未能成功搜索DM Tau和LkCa 15的SO，以及AB Aur、DM Tau和LkCa 15的c-C3 H2。我们的上限表明，与迄今为止观察到的所有分子种类相反，SO在DM Tau中不如在AB Aur中丰富。我们的研究结果表明，磁盘与AB Aur是丰富的分子物种。我们的化学模型表明，SO的检测是一致的，从一个非常年轻的磁盘上的分子吸附到晶粒尚未占主导地位的化学预期。
英文摘要：
Very few molecular species have been detected in circumstellar disks surrounding young stellar objects. We are carrying out an observational study of the chemistry of circumstellar disks surrounding T Tauri and Herbig Ae stars. First results of this study are presented in this note. We used the EMIR receivers recently installed at the IRAM 30m telescope to carry a sensitive search for molecular lines in the disks surrounding AB Aur, DM Tau, and LkCa 15. We detected lines of the molecules HCO+, CN, H2CO, SO, CS, and HCN toward AB Aur. In addition, we tentatively detected DCO+ and H2S lines. The line profiles suggest that the CN, HCN, H2CO, CS and SO lines arise in the disk. This makes it the first detection of SO in a circumstellar disk. We have unsuccessfully searched for SO toward DM Tau and LkCa 15, and for c-C3H2 toward AB Aur, DM Tau, and LkCa 15. Our upper limits show that contrary to all the molecular species observed so far, SO is not as abundant in DM Tau as it is in AB Aur. Our results demonstrate that the disk associated with AB Aur is rich in molecular species. Our chemical model shows that the detection of SO is consistent with that expected from a very young disk where the molecular adsorption onto grains does not yet dominate the chemistry.
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