如果你喜欢C/O的变化，你应该把它的戒指
If you like C/O variations, you should have put a ring on it
摘要：
在原行星盘中用C $_2$ H发射跟踪的C/O比对于限制系外行星的形成机制和我们对盘中挥发性耗尽的理解是基本的，但是当前的C $_2$ H观测显示出明显的双峰分布，这还不清楚，表明C/O分布不是由简单的径向依赖描述的。冰卵石的输运被认为通过沉降、漂移和压力隆起的捕获改变了原行星盘中的局部元素丰度，导致表面挥发物的耗尽和元素C/O的增加。我们结合所有磁盘与空间分辨ALMA C $_2$ H观测与高分辨率连续图像和CO雪线的约束，以确定是否C $_2$ H发射确实与冰卵石的位置。我们报告了一个显着的CO-冰尘埃水库和高C $_2$ H排放，这是只发现在磁盘与尘埃环以外的CO雪线的存在之间可能存在的相关性。相比之下，紧凑的尘埃盘（没有压力颠簸）和温暖的过渡磁盘（与他们的尘环内的CO雪线）没有检测到在C $_2$ H，这表明这种磁盘可能从来没有包含一个显着的CO冰水库。这种相关性提供了证据的C/O配置文件的CO雪线和压力凸起的位置在磁盘中的复杂的相互作用的调节。这些结果表明，包括尘埃运输化学磁盘模型的重要性，为正确解释系外行星大气成分，并更好地了解挥发性消耗磁盘，特别是使用一氧化碳同位素，以确定气体表面密度。
英文摘要：
The C/O-ratio as traced with C$_2$H emission in protoplanetary disks is fundamental for constraining the formation mechanisms of exoplanets and our understanding of volatile depletion in disks, but current C$_2$H observations show an apparent bimodal distribution which is not well understood, indicating that the C/O distribution is not described by a simple radial dependence. The transport of icy pebbles has been suggested to alter the local elemental abundances in protoplanetary disks, through settling, drift and trapping in pressure bumps resulting in a depletion of volatiles in the surface and an increase of the elemental C/O. We combine all disks with spatially resolved ALMA C$_2$H observations with high-resolution continuum images and constraints on the CO snowline to determine if the C$_2$H emission is indeed related to the location of the icy pebbles. We report a possible correlation between the presence of a significant CO-icy dust reservoir and high C$_2$H emission, which is only found in disks with dust rings outside the CO snowline. In contrast, compact dust disks (without pressure bumps) and warm transition disks (with their dust ring inside the CO snowline) are not detected in C$_2$H, suggesting that such disks may never have contained a significant CO ice reservoir. This correlation provides evidence for the regulation of the C/O profile by the complex interplay of CO snowline and pressure bump locations in the disk. These results demonstrate the importance of including dust transport in chemical disk models, for a proper interpretation of exoplanet atmospheric compositions, and a better understanding of volatile depletion in disks, in particular the use of CO isotopologues to determine gas surface densities.
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