论文标题
碳谷物升华：Protostellar化学的新自上而下的成分
Carbon-grain sublimation: a new top-down component of protostellar chemistry
论文作者
论文摘要
地球的碳赤字一直是我们对太阳系形成的理解。一种可能的解决方案是在行星形成过程的早期所谓的烟灰线（〜300 K）上的碳颗粒升华。在这里，我们认为该过程的最可能的特征是烟灰线内的碳氢化合物和硝酸盐过量，与含氧含氧的复杂有机物相比，这些分子的激发温度更高，这些有机物在水雪线周围取消（〜100 K）。在文献中已经报道了这种特征，例如，在猎户座的KL中，尽管并不统一，但可能是由于观察环境的差异和不同研究的分析方法的差异，或者与Protostellar增生的情节性质有关。如果此过程是活跃的，这意味着在原始阶段，迄今为止存在一个从上层起作用的碳化学成分 - 从较大物种的破坏开始 - 而不是从原子上底部。在这种自上而下的成分存在下，需要重新探索有机分子的起源。
Earth's carbon deficit has been an outstanding problem in our understanding of the formation of our Solar System. A possible solution would be the sublimation of carbon grains at the so-called soot line (~300 K) early in the planet-formation process. Here, we argue that the most likely signatures of this process are an excess of hydrocarbons and nitriles inside the soot line, and a higher excitation temperature for these molecules compared to oxygen-bearing complex organics that desorb around the water snowline (~100 K). Such characteristics have been reported in the literature, for example, in Orion KL, although not uniformly, potentially due to differences in observational settings and analysis methods of different studies or related to the episodic nature of protostellar accretion. If this process is active, this would mean that there is a heretofore unknown component to the carbon chemistry during the protostellar phase that is acting from the top down - starting from the destruction of larger species - instead of from the bottom up from atoms. In the presence of such a top-down component, the origin of organic molecules needs to be re-explored.
