三尾之 tale：一个偏移的流体和围绕[BHB2007]1的神秘结构
A tale of three tails: A misaligned streamer and mysterious structures around [BHB2007]1
AI总结：
研究发现[BHB2007]1周围存在三个延伸结构，其中两个对称分布于盘南北两侧，但动力学和形态复杂，可能由出流或相互作用形成，而西侧的柱状结构显示引力束缚吸积，可能由云物质引力捕获形成，支持动态的恒星形成过程。
摘要：
最近在原恒星源周围发现的流体状结构挑战了传统孤立、轴对称恒星形成的传统图景。在这里，我们呈现了新的ALMA观测结果，针对[BHB2007]1，这是一个与至少三个延伸结构相连的扁谱源。其中两个特征对称地位于盘的北侧和南侧，其速度与盘各自一侧对齐。然而，它们的非束缚动力学和弯曲形态使得难以确定其起源。可能的解释包括出流、与附近BHB2系统的相互作用以及双曲性吸积，但没有任何一种完全解释所有观测到的特性。相比之下，新发现的向西延伸的柱状结构显示出明显的引力束缚吸积证据。对其质量、质量吸积率和角动量的估计表明，这个吸积流体将大致使可用于形成行星的质量预算翻倍，并使盘倾斜几十度。此外，其与盘中面的不对齐以及缺乏弥散包层发射表明，该流体可能由于引力捕获与源的原核心无关的云物质而形成。这些发现支持了更为动态的恒星形成图景，其中环境相互作用继续塑造构建行星系统的条件。
英文摘要：
Recent discoveries of streamer-like structures around protostellar sources challenge the traditional picture of isolated, axisymmetric star formation. Here, we present new ALMA observations of [BHB2007]1, a flat-spectrum source connected to at least three such elongated structures. Two of these features are symmetrically located to the north and south of the disk, with velocities aligned with the disk on their respective sides. However, their unbound kinematics and curved morphology make it difficult to determine their origin. Possible explanations include outflows, interactions with the nearby BHB2 system, and hyperbolic infall, but none fully account for all observed properties. In contrast, a newly identified collimated structure to the west shows clear evidence of gravitationally bound infall. Estimates of its mass, mass infall rate, and angular momentum suggest that this infalling streamer would roughly double the mass budget available to form planets and tilt the disk by a few tens of degrees. Furthermore, its misalignment with the midplane of the disk and the lack of diffuse envelope emission indicate that the streamer may have formed due to gravitational capture of cloud material unrelated to the source's natal core. Together, these findings support a more dynamic picture of star formation, one where environmental interactions continue to shape conditions for building planetary systems.
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