From atoms to prebiotic molecules on the surface of cosmic dust grains

从原子到宇宙尘埃颗粒表面的生命起源前分子

• 批准号: 504825294
• 负责人: Dr. Cornelia Jäger
• 金额: --
• 依托单位: Laboratory Astrophysics and Cluster Physics Group
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/504825294?language=en
• 关键词: atoms; prebiotic; molecules; surface; cosmic

The re-submitted research project will deal with the formation of important organic as well as prebiotic molecules that could serve as precursor materials for the formation of more complex biological building blocks of life on Earth or exoplanets. The generation of prebiotic molecules in the interstellar medium and protoplanetary disks and their final delivery and accumulation to planets by comets and meteorites represents an interesting scenario for the evolution of complex organics by astrochemical processes. Amino acids and sugar molecules can be considered as important biological-relevant molecules, because they are the building blocks of proteins and nucleosides, respectively. Precursors of amino acids and sugar molecules have been identified in different astrophysical environments. Glycine, the simplest amino acid, has been detected in comets and meteorites. This research proposal is devoted to systematic experimental studies on the formation of complex organic molecules on the surface of cosmic grain analogs including carbonaceous and siliceous dust grains at conditions prevailing in the ISM. A series of experiments will focus on the interaction of refractory carbon surfaces with atomic beams consisting of H and O, N and H, as well as N and O atoms. The formation of prebiotic molecules including important hydrogen- oxygen- and nitrogen-bearing molecules by the contribution and erosion of carbon grains will be studied. The second part of the research project will be dedicated to the hydrogenation reactions of CO and HCN on the surface of silicates and carbon particles. The main goals of the project concentrate on a better understanding of the astrochemical evolution of grains and molecules and the study of the astrochemical origins of COMs detected in the ISM. In addition, we want to investigate the environmental conditions that favor the formation of prebiotic molecules such as amino acids or precursors of sugar molecules on dust grains. The results will provide important information on the synthesis of biomolecules in different areas of the interstellar medium.

重新提交的研究项目将处理重要的有机物和益生元分子的形成，这些有机物和益生元分子可以用作形成更复杂的地球或系外行星生命生命块的前体材料。星际培养基和原始磁盘中的益生元分子的产生以及它们通过彗星和陨石向行星的最终递送和积累，这是一个有趣的场景，用于通过天体化学过程进化复杂有机物的情况。氨基酸和糖分子可以被视为重要的生物学分子，因为它们分别是蛋白质和核苷的组成部分。在不同的天体物理环境中已经鉴定出氨基酸和糖分子的前体。甘氨酸是最简单的氨基酸，已在彗星和陨石中检测到。该研究建议致力于系统的实验研究，以了解在ISM中普遍存在的条件下，在宇宙晶粒类似物表面上形成复杂的有机分子。一系列实验将集中于难治性碳表面与由H和O，N和H以及N和O原子组成的原子束的相互作用。将研究通过碳晶粒的贡献和侵蚀，包括重要的氢氧和含氮分子的益生元分子的形成。研究项目的第二部分将用于硅酸盐和碳颗粒表面上CO和HCN的氢化反应。该项目的主要目标集中在更好地理解谷物和分子的天体化学演化以及对ISM中检测到的COM的天文学起源的研究。 此外，我们还想研究有利于形成的二含氨基酸或糖分子前体在粉尘晶粒上形成的环境条件。结果将提供有关星际培养基不同区域中生物分子合成的重要信息。