英仙座分子云内原恒星核与无恒星核中的富碳链化学 inventory
Inventories of Rich Carbon-Chain Chemistry in Prestellar and Starless Cores in the Perseus Molecular Cloud
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中文总结 AI 辅助
本研究通过耶韦斯40米望远镜观测英仙座15个原恒星核与无恒星核，探测到多种碳链分子及同位素体，揭示其碳链化学丰富性，为研究碳链储库的演化及后续对行星系统的贡献提供了依据。
中文摘要 AI 辅助
碳链分子是活性有机物的重要储库，最终会被原行星盘、行星及彗星物质所吸纳。原恒星核与无恒星核由分子云中寒冷（约10 K）、致密（约10⁵ cm⁻³）的气体与尘埃团块构成，是低质量恒星与行星系统的诞生地。过往对无恒星核的研究多聚焦于复杂有机分子（COMs），而对无恒星核中碳链的观测较为有限。本研究分析了英仙座分子云中15个原恒星核与无恒星核的碳链 inventory，利用耶韦斯40米单天线望远镜观测，在至少10/15个核中探测到CS、CCS、CCCS、HC₃N、DC₃N与HC₅N，在4/15个核中探测到HC₇N；还探测到相关同位素体，包括¹³CS、C³⁴S、C¹³CS、CC³⁴S、H¹³CCCN、HC¹³CCN、HCC¹³CN、HC¹³CCCCN、HCC¹³CCCN、HCCC¹³CCN、HCCCCC¹⁵N与DCCCCCN。本研究报告了探测统计结果，将柱密度比值与金牛座、巨蛇座及原恒星源进行对比，研究了DC₃N/HC₃N的氘分馏情况，并探究了氰多炔（HCₙN）与含硫碳链（CₙS）之间的相对丰度及相关性。所探测到的多样分子种类揭示了英仙座碳链化学的丰富性，表明密度、温度、与原恒星活动的邻近程度等局地环境条件会塑造每个核的分子 inventory 及其相对演化阶段。本研究结果让人们得以一窥英仙座无恒星核与原恒星核中的碳链储库，这些碳链最终可能会被新生的原行星盘继承，并融入行星系统及与生物相关的物质中。
英文摘要
Carbon-chain molecules serve as an important reservoir of reactive organic matter that will eventually be incorporated into protoplanetary disks, planets, and cometary material. Prestellar and starless cores are composed of cold (~ 10 K) and dense (~ 10$^5$ cm$^{-3}$) clumps of gas and dust within molecular clouds, and are nurseries for low-mass stars and planetary systems. Surveys of starless cores have focused on the study of complex organic molecules, COMs, whereas observations of carbon-chains in starless cores are limited. We analyze the carbon-chain inventories of 15 prestellar and starless cores in the Perseus Molecular Cloud. Using Yebes 40m single-dish observations, we detect CS, CCS, CCCS, HC$_3$N, DC$_3$N, and HC$_5$N in at least 10/15 cores and HC$_7$N in 4/15 cores. Our study also finds related isotopologues, where $^{13}$CS, C$^{34}$S, C$^{13}$CS, CC$^{34}$S, H$^{13}$CCCN, HC$^{13}$CCN, HCC$^{13}$CN, HC$^{13}$CCCCN, HCC$^{13}$CCCN, HCCC$^{13}$CCN, HCCCCC$^{15}$N, and DCCCCCN are detected. We report detection statistics, compare column density ratios with Taurus, Serpens, and protostar sources, examine DC$_3$N/HC$_3$N deuterium fractionation, and investigate the relative abundances and correlations between cyanopolyyne (HC$_n$N) and sulfur-bearing (C$_n$S) carbon-chains. The diverse suite of species detected reveals the richness of carbon-chain chemistry in Perseus and illustrates how local environmental conditions, such as density, temperature, and proximity to protostellar activity, shape each core's molecular inventory and relative evolutionary phase. Our findings provide a glimpse into the carbon-chain reservoir of starless and prestellar cores in Perseus, which may ultimately be inherited by emerging protoplanetary disks and later integrated into planetary systems and biologically relevant material.
发表机构
- University of California, Berkeley（加州大学伯克利分校）
- National Radio Astronomy Observatory（美国国家射电天文台）
- RIKEN Cluster for Pioneering Research（理化学研究所先导研究集群）
- Steward Observatory, University of Arizona（亚利桑那大学斯图尔德天文台）
- Centro de Astrobiología (CAB), CSIC-INTA（天体生物学中心，西班牙科学研究中心-国家航空航天技术研究所）
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