冰河时代 JWST 对致密分子云冰的普查
星系天体物理
2023-01-24 v1 地球与行星天体物理
太阳与恒星天体物理
摘要
冰质颗粒幔是挥发性元素的主要储库，这些元素将暗星际云中的化学过程与行星形成及其大气组成联系起来。初始冰成分形成于分子云寒冷致密部分，早于恒星形成的开始。借助 JWST 的卓越灵敏度，这一冰演化关键阶段现已可详细研究。本文展示早期释放科学计划“冰河时代”（Ice Age）的首批结果，揭示了这些致密云冰的丰富组成。弱冰，包括 CO、OCN、CO、OCS 和 COMs 官能团，现已沿两条前恒星视线被探测到。CO 冰剖面表明冰质颗粒有适度增长。主要与次要冰物种的柱密度表明，冰对关键 C、O、N 和 S 元素总体预算的贡献在 2% 至 19% 之间。我们的结果表明，简单与复杂分子的形成可能早在富水冰环境中便已开始。
引用
@article{arxiv.2301.09140,
title = {An Ice Age JWST inventory of dense molecular cloud ices},
author = {M. K. McClure and W. R. M. Rocha and K. M. Pontoppidan and N. Crouzet and L. E. U. Chu and E. Dartois and T. Lamberts and J. A. Noble and Y. J. Pendleton and G. Perotti and D. Qasim and M. G. Rachid and Z. L. Smith and Fengwu Sun and Tracy L Beck and A. C. A. Boogert and W. A. Brown and P. Caselli and S. B. Charnley and Herma M. Cuppen and H. Dickinson and M. N. Drozdovskaya and E. Egami and J. Erkal and H. Fraser and R. T. Garrod and D. Harsono and S. Ioppolo and I. Jimenez-Serra and M. Jin and J. K. Jørgensen and L. E. Kristensen and D. C. Lis and M. R. S. McCoustra and Brett A. McGuire and G. J. Melnick and Karin I. Oberg and M. E. Palumbo and T. Shimonishi and J. A. Sturm and E. F. van Dishoeck and H. Linnartz},
journal= {arXiv preprint arXiv:2301.09140},
year = {2023}
}
备注
To appear in Nature Astronomy on January 23rd, 2023. 33 pages, 16 figures, 3 tables; includes extended and supplemental data sections. Part of the JWST Ice Age Early Release Science program's science enabling products. Enhanced spectra downloadable on Zenodo at the following DOI: 10.5281/zenodo.7501239