Icy Origins of Organic Molecules Unveiled by JWST

JWST 揭示了有机分子的冰冷起源

• 批准号: 22K20389
• 负责人: 楊 燿綸
• 金额: $ 1.83万
• 依托单位: Institute of Physical and Chemical Research
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Research Activity Start-up
• 财政年份: 2022
• 资助国家: 日本
• 起止时间: 2022-08-31 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22K20389/
• 关键词: interstellar ice; astrochemistry; low-mass protostars; infrared spectrscopy; Astrochemistry; Ice; Infrared Astronomy; interstellar ice; astrochemistry; low-mass protostars; infrared spectrscopy; Astrochemistry; Ice; Infrared Astronomy

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.

该研究计划的主要目标是使用JWST数据测量四个年轻质体的冰丰度，并通过辐射转移计算测试化学模型。我一直在领导合作，以开发数据降低和从其吸收特征测量冰柱密度的方法。我们在天体物理学期刊（Yang等，2022b）上发表了冰特征以及喷气和流出表征的首次识别。 在本文中，我们介绍了年轻原恒星的第一个JWST光谱，鉴定了众所周知的冰分以及可能是由于有机分子（例如乙醇和乙醛）引起的特征。 我们还展示了JWST光谱数据的独特能力，不仅是冰的测量值，而且还表征了年轻质恒定的流出和喷射，在这些观察中，由于高灭绝，这种观察力都在挑战。 此外，该项目正在进行许多项目。 详细的ICE分析由J. Kim（Kasi）和C.-H.先生领导。 Kim（SNU）与我自己是主要导师。我还开始与Salyk博士（Vasser）和Okoda博士（Riken）合作，以扩大该研究计划的呼吸。