Radiation-induced reactions in comet analogues

IF 1.7 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS International Journal of Astrobiology Pub Date : 2022-12-01 DOI:10.1017/s1473550422000416
A. López-Islas, A. Negrón-Mendoza
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Abstract

Comets are a source of prebiotic molecules that likely enriched the early Earth during the Late Heavy Bombardment period. Laboratory experiments that replicate cometary conditions may facilitate understanding of the chemical reactions and supplement observational studies of these icy bodies. Prebiotic compounds, such as formic acid and formaldehyde, have been observed in comets. Furthermore, these compounds can easily be formed in experimental models using a variety of gas combinations and energy sources. We conducted experimental cometary simulations using radiation chemistry tools to obtain insight into the possible fate of formic acid and formaldehyde. The main results suggest a redundant system, signifying that the irradiation of formic acid forms formaldehyde molecules and vice versa. This phenomenon ensures the permanence of prebiotic molecules in high-radiation environments. Additionally, the potential role of forsterite and graphite was explored in cometary simulations. Our experimental results show the differential formation of aldehydes and other carbonyl-containing compounds dependent on the mineral phase present.
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类似彗星的辐射诱发反应
彗星是生命前分子的来源,可能在晚期重轰炸时期丰富了早期地球。复制彗星条件的实验室实验可能有助于理解化学反应,并补充对这些冰体的观测研究。益生元化合物,如甲酸和甲醛,已经在彗星中被观察到。此外,这些化合物可以很容易地在使用各种气体组合和能源的实验模型中形成。我们使用辐射化学工具进行了彗星模拟实验,以深入了解甲酸和甲醛的可能命运。主要结果表明一个冗余系统,表明甲酸辐照形成甲醛分子,反之亦然。这种现象保证了益生元分子在高辐射环境中的持久性。此外,在彗星模拟中还探索了橄榄石和石墨的潜在作用。我们的实验结果表明,醛和其他含羰基化合物的不同形成取决于存在的矿物相。
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来源期刊
International Journal of Astrobiology
International Journal of Astrobiology 地学天文-地球科学综合
CiteScore
3.70
自引率
11.80%
发文量
45
审稿时长
>12 weeks
期刊介绍: International Journal of Astrobiology is the peer-reviewed forum for practitioners in this exciting interdisciplinary field. Coverage includes cosmic prebiotic chemistry, planetary evolution, the search for planetary systems and habitable zones, extremophile biology and experimental simulation of extraterrestrial environments, Mars as an abode of life, life detection in our solar system and beyond, the search for extraterrestrial intelligence, the history of the science of astrobiology, as well as societal and educational aspects of astrobiology. Occasionally an issue of the journal is devoted to the keynote plenary research papers from an international meeting. A notable feature of the journal is the global distribution of its authors.
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