Icy Origins of Organic Molecules Unveiled by JWST

这项研究计划的主要目标是测量四颗年轻原恒星的冰丰度，并使用JWST数据通过辐射传输计算测试化学模型。我一直在领导合作开发数据简化和测量冰柱密度的方法，从它的吸收特征。我们在《天体物理学杂志快报》（Astrophysical Journal Letter）上首次发表了对冰特征以及射流和流出特性的鉴定（Yang et al. 2022b）。在这篇文章中，我们展示了一颗年轻的原恒星的第一个JWST光谱，确定了众所周知的冰特征以及可能由有机分子（如乙醇和乙醛）引起的特征。我们还展示了JWST光谱数据的独特能力，不仅可以测量冰，还可以表征年轻原恒星的流出和喷流，这些观测由于高消光而具有挑战性。此外，在这个项目中还有一些项目正在进行中。详细的冰分析由J. Kim博士（KASI）和C.-H.先生领导。我是金（首尔大学）的主要导师。我还开始与Salyk博士（Vasser）和Okoda博士（RIKEN）合作，扩大这个研究项目的规模。

The primary goals of this research program is to measure the ice abundance in four young protostars and test chemical models with radiative transfer calculations, using JWST data. I have been leading the collaboration to develop the method of data reduction and measuring ice column density from its absorption feature. We published the first identification of ice features as well as jet and outflow characterization on the Astrophysical Journal Letter (Yang et al. 2022b). In this article, we presented the first JWST spectrum of a young protostar, identifying both commonly known ice feature as well as the features that could be due to organic molecules, such as ethanol and acetaldehyde. We also demonstrate the unique capability of JWST spectroscopic data on not only ice measurements but also characterizing outflows and jets in young protostars, where such observations were challenging to perform due to high extinction. Moreover, there are a number of projects underway in this project. The detailed ice analysis is led by Dr. J. Kim (KASI) and Mr. C.-H. Kim (SNU) with myself as the main mentor. I also started collaborations with Dr. Salyk (Vasser) and Dr. Okoda (RIKEN) to expand the breath of this research program.