温暖Herbig Ae星周盘的高分辨率ALMA分子普查：II. IRS 48盘中丰富的复杂有机物和挥发性硫
An ALMA molecular inventory of warm Herbig Ae disks: II. Abundant complex organics and volatile sulphur in the IRS 48 disk
AI总结：
利用ALMA在IRS 48盘中探测到16种分子，首次发现H213CO、34SO、33SO和环氧乙烷，并揭示复杂有机物与含硫物种的空间偏移，表明盘内冰的化学加工，凸显其作为天体化学实验室的价值。
摘要：
阿塔卡马大型毫米/亚毫米波阵列（ALMA）能够以前所未有的灵敏度探测行星形成盘中的分子含量。这些观测使我们能够建立可用于形成行星和彗星的挥发性物质的清单。Herbig Ae过渡盘因其盘中复杂有机分子（COM）和可能富含H2O的冰的热升华而成为富有成效的研究目标。IRS 48盘显示出特别丰富的化学性质，这可以直接与其不对称的尘埃陷阱相关联。在此，我们展示了IRS 48盘的ALMA观测结果，在其中我们探测到16种不同的分子，并首次在原行星盘中可靠探测到H213CO、34SO、33SO和c-H2COCH2（环氧乙烷）。除CO外，所有分子发射都与尘埃陷阱共位，这包括新探测到的简单分子如HCO+、HCN和CS。有趣的是，不同分子族之间存在空间偏移，包括复杂有机物和含硫物种之间，后者在方位角上延伸更广，且在径向上离恒星更远。新探测到的复杂有机物相对于CH3OH的丰度高于预期的原恒星比值，这暗示在盘的生命周期中，继承的冰经历了某种程度的化学加工。这些数据凸显了IRS 48作为一个独特的天体化学实验室，可用于揭示行星和彗星形成时期完整的挥发性物质储库，以及盘在（重新）设定化学复杂性方面的作用。
英文摘要：
The Atacama Large Millimeter/submillimeter Array (ALMA) can probe the molecular content of planet-forming disks with unprecedented sensitivity. These observations allow us to build up an inventory of the volatiles available for forming planets and comets. Herbig Ae transition disks are fruitful targets due to the thermal sublimation of complex organic molecule (COM) and likely H2O-rich ices in these disks. The IRS 48 disk shows a particularly rich chemistry that can be directly linked to its asymmetric dust trap. Here, we present ALMA observations of the IRS 48 disk where we detect 16 different molecules and make the first robust detections of H213CO, 34SO, 33SO and c-H2COCH2 (ethylene oxide) in a protoplanetary disk. All of the molecular emissions, aside from CO, are colocated with the dust trap and this includes newly detected simple molecules such as HCO+, HCN and CS. Interestingly, there are spatial offsets between different molecular families, including between the COMs and sulphur-bearing species, with the latter being more azimuthally extended and located radially further from the star. The abundances of the newly detected COMs relative to CH3OH are higher than the expected protostellar ratios, which implies some degree of chemical processing of the inherited ices during the disk lifetime. These data highlight IRS 48 as a unique astrochemical laboratory to unravel the full volatile reservoir at the epoch of planet and comet formation and the role of the disk in (re)setting chemical complexity.
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