Ethylene oxide and acetaldehyde in hot cores
Ethylene oxide and acetaldehyde in hot cores
复制标题
热核心中的环氧乙烷和乙醛
DOI：
10.1051/0004-6361/201322598
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发表时间：
2014
影响因子：
6.5
通讯作者：
Occhiogrosso A
中科院分区：
文献类型：
--
作者：
Occhiogrosso A
环氧乙烷（c-C2 H4 O）及其异构体乙醛（CH 3CHO）是重要的复杂有机分子，因为它们在氨基酸的形成中具有潜在的作用。在热核中发现的环氧乙烷表明，存在着碳原子数超过3的环状分子，如呋喃（c-C4 H4 O），核糖（DNA中的糖）与之密切相关。目的尽管乙醛在星际介质中普遍存在，但在冷源中还没有发现环氧乙烷。我们的目标是了解化学的形成和损失的环氧乙烷在热和冷的星际物体（一）包括在一个修订的气体颗粒网络的一些最近的实验结果在粮食表面和（ii）通过比较其异构体的化学行为，acetaldehyde.MethodsWe引入一个完整的化学网络环氧乙烷使用修订的气体颗粒化学模型。我们测试代码的情况下，一个热的核心。该模型使我们能够预测的气体和固体环氧乙烷的丰度在冷却阶段之前，星星形成，并在随后的热身阶段。因此，我们可以预测在什么温度下，环氧乙烷的形式在粮食表面上，并在什么温度下，它开始解吸到gasphase.ResultsThe模型再现所观察到的气体丰度的环氧乙烷和乙醛对高质量的恒星形成区域。此外，我们的研究结果表明，环氧乙烷可能存在于其异构体已经被检测到的热核心的外部和较冷的区域。我们的新结果与以前的结果相比，它集中在形成的环氧乙烷ONLY. CONCLUSIONS尽管他们不同的化学结构，环氧乙烷的化学是耦合到乙醛，这表明乙醛可用作示踪剂环氧乙烷对冷芯。
ContextEthylene oxide (c-C2H4O), and its isomer acetaldehyde (CH3CHO), are important complex organic molecules because of their potential role in the formation of amino acids. The discovery of ethylene oxide in hot cores suggests the presence of ring-shaped molecules with more than 3 carbon atoms such as furan (c-C4H4O), to which ribose, the sugar found in DNA, is closely related.AimsDespite the fact that acetaldehyde is ubiquitous in the interstellar medium, ethylene oxide has not yet been detected in cold sources. We aim to understand the chemistry of the formation and loss of ethylene oxide in hot and cold interstellar objects (i) by including in a revised gas-grain network some recent experimental results on grain surfaces and (ii) by comparison with the chemical behaviour of its isomer, acetaldehyde.MethodsWe introduce a complete chemical network for ethylene oxide using a revised gas-grain chemical model. We test the code for the case of a hot core. The model allows us to predict the gaseous and solid ethylene oxide abundances during a cooling-down phase prior to star formation and during the subsequent warm-up phase. We can therefore predict at what temperatures ethylene oxide forms on grain surfaces and at what temperature it starts to desorb into the gas phase.ResultsThe model reproduces the observed gaseous abundances of ethylene oxide and acetaldehyde towards high-mass star-forming regions. In addition, our results show that ethylene oxide may be present in outer and cooler regions of hot cores where its isomer has already been detected. Our new results are compared with previous results, which focused on the formation of ethylene oxide only.ConclusionsDespite their different chemical structures, the chemistry of ethylene oxide is coupled to that of acetaldehyde, suggesting that acetaldehyde may be used as a tracer for ethylene oxide towards cold cores.
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DOI：
10.1086/163060
发表时间：
1985
期刊：
The Astrophysical Journal
影响因子：
--
作者：
E. Herbst
通讯作者：
E. Herbst
影响因子：
4.9
作者：
Oeberg, Karin I.;van der Marel, Nienke;van Dishoeck, Ewine F.
通讯作者：
van Dishoeck, Ewine F.
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DOI：
10.1111/j.1365-2966.2012.22112.x
发表时间：
2012
影响因子：
4.8
作者：
A. Occhiogrosso;S. Viti;Michael D. Ward;Stephen D. Price
通讯作者：
Stephen D. Price
DOI：
10.1086/163018
发表时间：
1985
期刊：
The Astrophysical journal
影响因子：
--
作者：
H. Matthews;P. Friberg;W. Irvine
通讯作者：
W. Irvine
微波检测星际乙烯醇，CH2=CHOH
DOI：
10.1086/324762
发表时间：
2001
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
B. Turner;A. Apponi
通讯作者：
A. Apponi