原行星盘中的碳同位素分馏
Carbon isotope fractionation in protoplanetary disks
摘要：
我们研究了气相和颗粒表面化学在内部30 AU的一个典型的原行星盘使用一个新的模型，该模型计算的气体温度，通过解决气体加热和冷却平衡，并有一个改进的处理的紫外辐射场。我们讨论一般的内盘化学，获得良好的协议与最近的观测，探测材料的内部区域的原行星盘。我们还应用我们的模型来研究碳的同位素分馏。结果表明，系统的分馏比（12 C/13 C）随半径和盘内高度的变化而变化。在不同物种的分馏中可以看到不同的行为。我们将我们的结果与太阳系彗星中的12 C/13 C比率进行比较，发现了鲜明的对比，表明了后处理。
英文摘要：
We investigate the gas-phase and grain-surface chemistry in the inner 30 AU of a typical protoplanetary disk using a new model which calculates the gas temperature by solving the gas heating and cooling balance and which has an improved treatment of the UV radiation field. We discuss inner-disk chemistry in general, obtaining excellent agreement with recent observations which have probed the material in the inner regions of protoplanetary disks. We also apply our model to study the isotopic fractionation of carbon. Results show that the fractionation ratio, 12C/13C, of the system varies with radius and height in the disk. Different behaviour is seen in the fractionation of different species. We compare our results with 12C/13C ratios in the Solar System comets, and find a stark contrast, indicative of reprocessing.
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