对不冷不热的Corino相进行建模--L1527是独一无二的吗？
Modeling the Lukewarm Corino Phase - is L1527 unique?
摘要：
Sakai等人在低质量恒星形成区L1527中观察到长链不饱和烃和氰基多炔，并将这一结果归因于气相离子分子化学，称为“暖碳链化学”，该化学发生在甲烷从变暖的谷物中蒸发期间和之后。源L1527是一个围绕着0/I类原恒星的包层，其区域温度略高，约为30 K。Sakai等人发现的分子通常只与暗分子云有关，而与更演化的热科里诺相无关。为了确定L1527是否在化学上不同于暗云，我们计算了包括各种加热程度的模型。结果表明，L1527的组成更可能是由于“暖碳链化学”而不是冷相的残余物。如果是这样的话，分子产物提供了一个以前未被描述的低质量恒星形成早期阶段的特征，可以被描述为“不冷不热”的科里诺。我们还包括预测其他分子物种，可能会观察到对候选人不冷不热的科里诺来源。虽然我们的计算表明，不饱和烃和氰基多炔可以在气相中产生的颗粒升温至30 K，他们也表明，这些物种不会迅速从气体中消失的温度达到200 K，这意味着这样的物种可能会检测到热corino和热的核心。
英文摘要：
Sakai et al. have observed long-chain unsaturated hydrocarbons and cyanopolyynes in the low-mass star-forming region L1527, and have attributed this result to a gas-phase ion-molecule chemistry, termed ``Warm Carbon Chain Chemistry'', which occurs during and after the evaporation of methane from warming grains. The source L1527 is an envelope surrounding a Class 0/I protostar with regions that possess a slightly elevated temperature of ~30 K. The molecules detected by Sakai et al. are typically associated only with dark molecular clouds, and not with the more evolved hot corino phase. In order to determine if L1527 is chemically distinct from a dark cloud, we compute models including various degrees of heating. The results indicate that the composition of L1527 is somewhat more likely to be due to ``Warm Carbon Chain Chemistry'' than to be a remnant of a colder phase. If so, the molecular products provide a signature of a previously uncharacterized early phase of low mass star formation, which can be characterized as a ``lukewarm'' corino. We also include predictions for other molecular species that might be observed toward candidate lukewarm corino sources. Although our calculations show that unsaturated hydrocarbons and cyanopolyynes can be produced in the gas phase as the grains warm up to 30 K, they also show that such species do not disappear rapidly from the gas as the temperature reaches 200 K, implying that such species might be detected in hot corinos and hot cores.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
