67P/楚留莫夫-格拉希门克彗星中含氮及氮氧的有机分子：一项非靶向研究
Nitrogen- and nitrogen-oxygen-bearing organic molecules in comet 67P/Churyumov-Gerasimenko: An untargeted investigation
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中文总结 AI 辅助
本研究通过分析罗塞塔任务ROSINA-DFMS的高分辨率质谱数据，探究67P彗星内彗发中含氮及氮氧的复杂有机分子，识别出相关分子并发现杂环丰富、烷基化显著的特征，为研究太空有机复杂性起源提供依据。
中文摘要 AI 辅助
彗星为研究太阳系历史提供了独特窗口，它们携带部分保存最完好的物质，并可通过原位探测获取。欧洲空间局的罗塞塔任务是彗星研究的里程碑，该任务首次与67P/楚留莫夫-格拉希门克彗星（67P）会合，对其进行了为期两年的近距离研究。除其他意外发现外，该任务的数据显示彗星含有比例惊人的有机物，包括难熔相和冰相中的有机物。本研究中，我们评估了罗塞塔任务的ROSINA双聚焦质谱仪（DFMS）在67P彗星内彗发中收集的高分辨率质谱数据，以前所未有的细节研究了通式为CnHmN和CnHmNO（n、m分别为碳、氢的化学计量系数）的含氮及氮氧的彗星复杂有机分子（COMs）。我们采用基于讨论的方法，结合奥卡姆剃刀的经验概念、相关天体物理环境的研究知识，以及分子自下而上简单组装的预期约束条件，提出了一组用于解释DFMS观测结果的示例性最小且非唯一的分子集合。尽管该集合可能未涵盖全部有机多样性，仅代表其下限，但它能以合理的确定性识别出许多含氮及氮氧的COMs，同时排除其他分子，有望为未来的观测活动提供参考，进而助力探索太空中有机复杂性的起源与演化。关键结果包括：杂环存在的有力证据，以及环状和无环物种均存在大量烷基化现象。这些发现与陨石和小行星中可溶性有机物的相关报道高度吻合……
英文摘要
Comets provide a unique window into the history of the Solar System as they carry some of the best-preserved material and make it available to in situ exploration. A milestone in comet studies was the European Space Agency's Rosetta mission, which, for the first time, rendezvoused with a comet, namely 67P/Churyumov-Gerasimenko (67P), and studied it from a close range for two years. Amongst other unexpected insights, data from this mission show that comets contain a surprisingly large portion of organics, both in the refractory and the icy phases. For this work, we evaluated high-resolution mass spectra collected in comet 67P's inner coma by Rosetta's ROSINA-Double Focusing Mass Spectrometer (DFMS). In unprecedented detail, we investigated the N- and NO-bearing cometary complex organic molecules (COMs) of the general sum formula CnHmN and CnHmNO, where n and m are the stoichiometric coefficients of carbon and hydrogen. Our discussion-driven approach combines the empirical concept of Occam's razor with knowledge from studies of relevant astrophysical environments and constraints expected from naive bottom-up assembly of molecules. We present an exemplary minimal and non-unique set of molecules needed to explain the DFMS observations. While this set might not capture the full organic diversity, but rather its lower limit, it identifies many N- and NO-bearing COMs with reasonable certainty, while excluding others, potentially informing future observational campaigns, and hence contributes to the exploration of the origin and evolution of organic complexity in space. Among the key results is strong evidence for an abundant presence of heterocycles as well as substantial alkylation of both cyclic and acyclic species. These findings align well with reports on soluble organic matter in meteorites and asteroids and ...
