Molecular content of the circumstellar disk in AB Aurigae - First detection of SO in a circumstellar disk
Molecular content of the circumstellar disk in AB Aurigae - First detection of SO in a circumstellar disk
复制标题
AB Aurigae 星周盘的分子含量 - 首次在星周盘中检测到 SO
DOI：
10.1051/0004-6361/201014905
复制
发表时间：
2010
影响因子：
6.5
通讯作者：
N. Marcelino
中科院分区：
文献类型：
--
作者：
A. Fuente;J. Cernicharo;M. Agúndez;O. Berné;J. Goicoechea;T. Alonso;N. Marcelino
在年轻恒星物体周围的星周盘中检测到的分子种类非常少。我们正在对金牛座 T 星和赫比格 Ae 星周围的星周盘的化学成分进行观测研究。本研究的初步结果在本说明中介绍。我们使用最近安装在 IRAM 30m 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谱线进行灵敏搜索。我们检测到分子 HCO+、CN、H2CO、SO、CS 和 HCN 朝向 AB Aur 的谱线。此外，我们还初步检测到了DCO+和H2S线。谱线轮廓表明 CN、HCN、H2CO、CS 和 SO 谱线出现在圆盘中。这使其成为首次在星周盘中检测到SO。我们未能成功地针对 DM Tau 和 LkCa 15 寻找 SO，以及针对 AB Aur、DM Tau 和 LkCa 15 寻找 c-C3H2。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 中的含量不如在 AB Aur 中丰富。我们的结果表明，与 AB Aur 相关的圆盘富含分子种类。我们的化学模型表明，SO 的检测与非常年轻的圆盘的预期一致，其中颗粒上的分子吸附尚未主导化学反应。
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.