DCO +作为暖盘表面电离探针的证据
Evidence for DCO+ as a probe of ionization in the warm disk surface
摘要：
在这封信中，我们模拟了原行星盘中DCO $^{+}$的化学性质。我们发现，DCO $^{+}$丰度的总体分布是定性类似的CO，但占主导地位的薄层位于内部磁盘表面。为了了解它的分布，我们研究了不同的关键气相氘化途径，可以导致DCO $^{+}$的形成。我们的分析表明，最近的更新，在涉及CH $_2$ D $^{+}$作为母体分子的DCO $^{+}$有利于氘分馏反应在温暖的条件下。因此，DCO $^{+}$的形成在发生X射线电离的盘的内部温暖表面层中增强。我们的分析指出，DCO $^{+}$不是一个可靠的CO雪线示踪剂，如前所述。因此，我们预测，DCO $^{+}$是一个示踪剂的活性氘，特别是X射线电离的内盘。
英文摘要：
In this Letter we model the chemistry of DCO$^{+}$ in protoplanetary disks. We find that the overall distribution of the DCO$^{+}$ abundance is qualitatively similar to that of CO but is dominated by thin layer located at the inner disk surface. To understand its distribution, we investigate the different key gas-phase deuteration pathways that can lead to the formation of DCO$^{+}$. Our analysis shows that the recent update in the exothermicity of the reaction involving CH$_2$D$^{+}$ as a parent molecule of DCO$^{+}$ favors deuterium fractionation in warmer conditions. As a result the formation of DCO$^{+}$ is enhanced in the inner warm surface layers of the disk where X-ray ionization occurs. Our analysis points out that DCO$^{+}$ is not a reliable tracer of the CO snow line as previously suggested. We thus predict that DCO$^{+}$ is a tracer of active deuterium and in particular X-ray ionization of the inner disk.
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