AI 中文总结
研究500秒差距内九个附近分子云中512颗原恒星盘排列，发现投影对间距达6000天文单位的多系统有优先盘排列，不能仅用湍流碎裂解释，高阶多系统与双星盘排列程度相当，且高阶多系统中平谱原恒星盘缺乏。
AI 中文摘要
多系统中原恒星盘的取向为控制多星系统形成、其后续动力学演化及其对行星形成盘的影响的主要机制提供了关键见解。我们利用CAMPOS和VANDAM调查的数据，对500秒差距内九个附近分子云中的512颗0类、I类和平谱原恒星进行了盘排列研究。我们的样本包括74个双星和31个高阶多系统。我们发现，投影对间距达6000天文单位的多系统在所有演化类别中都表现出相互间的优先盘排列，显著偏离湍流碎裂模型预测的随机分布。这表明多系统的形成不能仅用湍流碎裂来解释。几千天文单位尺度上的盘排列也难以用盘碎裂作为主要起源来解释。我们还发现高阶多系统中最近邻盘排列的程度与双星中的相当。最后，我们发现高阶多系统中平谱原恒星盘比年轻的0类和I类阶段明显缺乏。这种下降与快速动力学演化一致，其中大多数高阶系统在I类阶段结束时解体。
英文摘要
Protostellar disk orientations in multiple systems provide critical insights into the primary mechanisms that govern the formation of multiple-star systems, their subsequent dynamical evolution, and their impact on planet-forming disks. We present a disk alignment study of 512 Class 0, Class I, and flat-spectrum protostars across nine nearby molecular clouds within 500 pc, utilizing data from the CAMPOS and VANDAM surveys. Our sample includes 74 binaries and 31 high-order multiple systems. We find that multiple systems with projected pair separations up to 6000 au exhibit preferential disk alignment with respect to each other across all evolutionary classes, deviating significantly from the random distribution predicted by turbulent fragmentation models. This suggests that the formation of multiple systems cannot be explained by turbulent fragmentation alone. Disk alignment on scales of a few thousand au is also difficult to explain by disk fragmentation as the dominant origin. We further find that the degree of nearest-neighbor disk alignment in higher-order multiples is comparable to that in binaries. Finally, we identify a significant deficit of flat-spectrum protostellar disks in high-order multiple systems as compared to younger Class 0 and Class I phases. The decline is consistent with rapid dynamical evolution, in which most higher-order systems dissolve by the end of the Class I phase.
Comments39 pages, 25 figures, 4 tables. Accepted by A&A 2026.7.15
