Production of linear alkanes via the solid-state hydrogenation of interstellar polyynes
文献类型：期刊论文
| 作者 | Fedoseev, G.1,4; Li, X.1,4 ; Baratta, G. A.3; Palumbo, M. E.3; Chuang, K. -j.2
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2025-01-23 |
| 卷号 | 693页码:A277 |
| 关键词 | astrochemistry solid state: volatile comets: general ISM: clouds evolution ISM: molecules |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202452210 |
| 产权排序 | 1 |
| 英文摘要 | Context. Highly unsaturated carbon chains, including polyynes, have been detected in many astronomical regions and planetary systems. With the success of the QUIJOTE survey of the Taurus Molecular Cloud-1 (TMC-1), the community has seen a "boom" in the number of detected carbon chains. On the other hand, the Rosetta mission revealed the release of fully saturated hydrocarbons, C3H8, C4H10, C5H12, and (under specific conditions) C6H14 with C7H16, from the comet 67P/Churyumov-Gerasimenko. The detection of the latter two is attributed to dust-rich events. Similarly, the analysis of samples returned from asteroid Ryugu by Hayabusa2 mission indicates the presence of long saturated aliphatic chains in Ryugu's organic matter. Aims. The surface chemistry of unsaturated carbon chains under conditions resembling those of molecular clouds can provide a possible link among these independent observations. However, laboratory-based investigations to validate such a chemistry is still lacking. In the present study, we aim to experimentally verify the formation of fully saturated hydrocarbons by the surface hydrogenation of C2nH2(n > 1) polyynes under ultra-high vacuum conditions at 10 K. Methods. We undertook a two-step experimental technique. First, a thin layer of C2H2 ice was irradiated by UV-photons (>= 121 nm) to achieve a partial conversion of C2H2 into larger polyynes: C4H2 and C6H2. Afterwards, the obtained photoprocessed ice was exposed to H atoms to verify the formation of various saturated hydrocarbons. Results. In addition to C2H6, which was investigated previously, the formation of larger alkanes, including C4H10 and (tentatively) C6H14, is confirmed by our study. A qualitative analysis of the obtained kinetic data indicates that hydrogenation of HCCH and HCCCCH triple bonds proceeds at comparable rates, given a surface temperature of 10 K. This can occur on the timescales typical for the dark cloud stage. A general pathway resulting in formation of other various aliphatic organic compounds by surface hydrogenation of N- and O-bearing polyynes is also proposed. We also discuss the astrobiological implications and the possibility of identifying alkanes with JWST. |
| WOS关键词 | COMPLEX ORGANIC-MOLECULES ; C-13 ISOTOPIC FRACTIONATION ; HYDROCARBON CHEMISTRY ANALYSIS ; STARLESS CORES L1521B ; INFRARED-SPECTROSCOPY ; IONIZING-RADIATION ; ION IRRADIATION ; COMET 67P/CHURYUMOV-GERASIMENKO ; CLOUDS ACETALDEHYDE ; CHEMICAL DESORPTION |
| 资助项目 | European Union[664931] ; Netherlands Research School for Astronomy (NOVA)[2024] ; Progetto Premiale 2012 'iALMA' grant[CUP C52I13000140001] ; INAF Grant Ricerca Fondamentale 2022[CUP C63C22000900005] ; NWO via a VENI fellowship[VI.Veni.212.296] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001404890500011 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | European Union ; Netherlands Research School for Astronomy (NOVA) ; Progetto Premiale 2012 'iALMA' grant ; INAF Grant Ricerca Fondamentale 2022 ; NWO via a VENI fellowship |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/7442]  |
| 专题 | 天体化学研究团组 |
| 通讯作者 | Fedoseev, G. |
| 作者单位 | 1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 2.Leiden Univ, Lab Astrophys, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands 3.INAF, Osservatorio Astrofisico Catania, Via Santa Sofia 78, I-95123 Catania, Italy 4.Xinjiang Key Lab Radio Astrophys, Urumqi 830011, Peoples R China |
| 推荐引用方式 GB/T 7714 | Fedoseev, G.,Li, X.,Baratta, G. A.,et al. Production of linear alkanes via the solid-state hydrogenation of interstellar polyynes[J]. ASTRONOMY & ASTROPHYSICS,2025,693:A277. |
| APA | Fedoseev, G.,Li, X.,Baratta, G. A.,Palumbo, M. E.,&Chuang, K. -j..(2025).Production of linear alkanes via the solid-state hydrogenation of interstellar polyynes.ASTRONOMY & ASTROPHYSICS,693,A277. |
| MLA | Fedoseev, G.,et al."Production of linear alkanes via the solid-state hydrogenation of interstellar polyynes".ASTRONOMY & ASTROPHYSICS 693(2025):A277. |
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来源：新疆天文台
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