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arXiv 2409.04527astro-ph.SRastro-ph.EP
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在五个爆发源中发现的高质量内部区域

High Mass Inner Regions Found in Five Outbursting Sources

Jenny K. Calahan, Edwin A. Bergin, Merel van't Hoff, Ke Zhang, Nuria Calvet, Lee Hartmann

AI总结:

本研究利用 Northern Extended Millimeter Array 的连续谱与 C17O J=2-1 观测五个爆发源,测得内部约1000 au区域质量为0.33–3.4 Msun,表明其可能引力不稳定。

摘要:

年轻恒星天体被认为普遍会经历突然的吸积事件,从而导致热光度上升。这些爆发很可能与行星形成的开端同时发生,并可能影响行星的形成。这种吸积显著增强背后的原因是当前的一个活跃研究领域,而系统质量是一个关键参数。我们利用 Northern Extended Millimeter Array(北方扩展毫米波阵列)观测了五个爆发源(三个 FU Ori、一个 EX Or 和一个“特殊”源),主要目标是利用一条光学薄的 CO 谱线测定系统质量。我们同时使用连续谱发射和 C17O J=2-1 来估算每个天体中心区域的质量。C17O 发射可能同时包含星盘和内部包层物质,因此可作为星盘质量的上限;对我们的源而言,该质量范围为 0.33–3.4 Msun。这些推导得到的质量表明,在内部约 1000 au 范围内,沿视线方向含有足够质量,使这些源可能处于引力不稳定状态。

英文摘要:

Young stellar objects are thought to commonly undergo sudden accretion events that result in a rise in bolometric luminosity. These outbursts likely coincide with the onset of planet formation, and could impact the formation of planets. The reason behind this dramatic enhancement of accretion is an active area of research, and the mass of the system is a critical parameter. Using Northern Extended Millimeter Array, we survey five outbursting sources (three FU Ori, one EX Or, one 'peculiar' source) with the primary goal of determining the system's mass using an optically thin line of CO. We estimate the mass of a central region for each object that using both continuum emission and C17O J=2-1. The C17O emission likely includes both disk and inner envelope material, thus acts as an upper limit on the disk mass, ranging from 0.33-3.4 Msun for our sources. These derived masses suggest that the inner approx. 1000 au contains enough mass along the line of sight for these sources to be gravitationally unstable.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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