论文标题
部分可观测时空混沌系统的无模型预测
Fevering Interstellar Ices Have More CH3OD
论文作者
论文摘要
据认为，单授予的甲醇是在恒星形成的prestell核心阶段形成的。观察到的CH2DOH/CH3OD比例的变化表明其形成很大程度上取决于周围的云条件。因此，它是恒星形成开始之前物理条件的潜在示踪剂。代表典型prestellar核心的单点物理模型与化学模型耦合，以研究在prestellar阶段侵蚀甲醇的潜在形成途径。 H和D的简单添加反应无法再现观察到的丰度。实现经过实验验证的抽象方案的实施导致有效地形成甲基二苯酚，但缺乏足够的羟基含甲醇的形成。 CH3OD很可能是在后来的EvolutionaryMstage中形成的，这可能是由于HDO（和D2O）和CH3OH之间的HD-D交换反应来自H-D交换反应。 CH2DOH/CH3OD比在PRESTELLAR阶段不是物理条件的合适示踪剂，但可能更适合作为冰暖的示踪剂。
Mono-deuterated methanol is thought to form during the prestellar core stage of star formation. Observed variations in the CH2DOH/CH3OD ratio suggest that its formation is strongly dependent on the surrounding cloud conditions. Thus, it is a potential tracer of the physical conditions before the onset of star formation. A single-point physical model representative of a typical prestellar core is coupled to chemical models to investigate potential formation pathways towards deuterated methanol at the prestellar stage. Simple addition reactions of H and D are not able to reproduce observed abundances. The implementation of an experimentally verified abstraction scheme leads to the efficient formation of methyl-deuterated methanol, but lacks sufficient formation of hydroxy-deuterated methanol. CH3OD is most likely formed at a later evolutionarymstage, potentially from H-D exchange reactions in warm ices between HDO (and D2O) and CH3OH. The CH2DOH/CH3OD ratio is not an appropriate tracer of the physical conditions during the prestellar stage, but might be better suited as a tracer of ice heating.
