揭示由褐矮星LS-RCr驱动的外流A1：H-α作为褐矮星外流活动的示踪剂
Uncovering the Outflow Driven by the Brown Dwarf LS-RCr A1: H-alpha as a Tracer of Outflow Activity in Brown Dwarfs
摘要：
现在很明显，经典的金牛座T型外流通常伴随着年轻棕矮星的形成。到目前为止，已经发现了两个光学流出，本文提出的结果增加到三个。利用光谱天体测量法证实了蓝移外流中LS-RCrA 1禁戒发射线的起源。在禁戒线中未检测到流出物的红移成分，以及低速和高速流出物成分之间存在一些分离的证据，都不支持LS-RCrA 1具有边缘吸积盘的假设。这一分析的关键结果是发现了H-α线的外流成分。H-α线轮廓在机翼上有蓝移和红移的特征，光谱天体测量显示这也起源于外流。发现的H-α发射的BD可以有一个显着的贡献，从外流表明使用的H-α线宽作为代理的质量吸积在BD是不明确的。该方法假设可能的外流对H-α线通量的任何贡献都可以忽略不计。最后，事实上，H-α线跟踪两个叶的流出，而只有蓝移叶被视为在禁止发射点的存在下，尘埃孔的吸积盘的LS-RCrA 1。这在CTTS中很常见，被认为是行星形成的信号。
英文摘要：
It is now apparent that classical T Tauri-like outflows commonly accompany the formation of young brown dwarfs. To date two optical outflows have been discovered and results presented in this paper increase this number to three. Using spectro-astrometry the origin of the LS-RCrA 1 forbidden emission lines in a blue-shifted outflow is confirmed. The non-detection of the red-shifted component of the outflow in forbidden lines, along with evidence for some separation between low and high velocity outflow components, do not support the hypothesis that LS-RCrA 1 has an edge-on accretion disk. The key result of this analysis is the discovery of an outflow component to the H-alpha line. The H-alpha line profile has blue and red-shifted features in the wings which spectro-astrometry reveals to also originate in the outflow. The discovery that H-alpha emission in BDs can have a significant contribution from an outflow suggests the use of H-alpha line widths as a proxy of mass accretion in BDs is not clear-cut. This method assumes that any contribution to the H-alpha line flux from a possible outflow is negligible. Finally the fact that the H-alpha line traces both lobes of the outflow while only the blue-shifted lobe is seen in forbidden emission points to the presence of a dust hole in the accretion disk of LS-RCrA 1. This is commonly seen in CTTSs and is assumed to signal the onset of planet formation.
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