金牛座T星南冕座S亚au分辨率的风和磁层吸积
The wind and the magnetospheric accretion onto the T Tauri star S Coronae Australis at sub-au resolution
摘要：
为了研究原行星盘的内部区域，我们对经典的TTauri双星系统S CrA进行了近红外干涉观测。我们提出了第一个VLTI-重力高光谱分辨率（$R\sim$ 4000）的观测一个经典的TTauri二进制，S CrA（由S CrA N和S CrA S组成，由$\sim$ 1.4”），结合四个8米望远镜在双场模式。我们在近红外K波段的连续观测揭示了在每个双星的周围都有一个圆盘，在d $\sim$ 130 pc的倾角下，半通量半径约为0.1 au（$i=$ 28 $\pm$ 3 $^o$ 1和$i=$ 22 $\pm$ 6 $^o$），以及位置角（PA=0 $^o\pm$ 6 $^o$和PA=-2 $^o\pm$ 12 $^o$），表明它们是由一个共同的磁盘碎片形成的。S CrA N光谱显示出明亮的HeI和Br $γ$线发射，表现出反向P-Cygni分布，通常与下落气体有关。连续补偿的Br-$γ$谱线显示出一个紧凑的Br-$γ$发射区，其半径约为$\sim$ 0.06 au，是截断半径的2倍。这个组件主要是追踪风。此外，轻微的半径变化之间的蓝移和红移的Br $γ$线组件被边缘检测。在He I和Br $γ$谱线中存在着一个逆P-Cygni剖面，同时还试探性地探测到了一个稍大尺寸的蓝移Br $γ$谱线分量，这暗示了在S CrA N中同时存在着风和磁层吸积。
英文摘要：
To investigate the inner regions of protoplanetary disks, we performed near-infrared interferometric observations of the classical TTauri binary system S CrA. We present the first VLTI-GRAVITY high spectral resolution ($R\sim$4000) observations of a classical TTauri binary, S CrA (composed of S CrA N and S CrA S and separated by $\sim$1.4"), combining the four 8-m telescopes in dual-field mode. Our observations in the near-infrared K-band continuum reveal a disk around each binary component, with similar half-flux radii of about 0.1 au at d$\sim$130 pc, inclinations ($i=$28$\pm$3$^o$\ and $i=$22$\pm$6$^o$), and position angles (PA=0$^o\pm$6$^o$ and PA=-2$^o\pm$12$^o$), suggesting that they formed from the fragmentation of a common disk. The S CrA N spectrum shows bright HeI and Br$γ$ line emission exhibiting inverse P-Cygni profiles, typically associated with infalling gas. The continuum-compensated Br$γ$ line visibilities of S CrA N show the presence of a compact Br$γ$ emitting region the radius of which is about $\sim$0.06 au, which is twice as big as the truncation radius. This component is mostly tracing a wind. Moreover, a slight radius change between the blue- and red-shifted Br$γ$ line components is marginally detected. The presence of an inverse P-Cygni profile in the HeI and Br$γ$ lines, along with the tentative detection of a slightly larger size of the blue-shifted Br$γ$ line component, hint at the simultaneous presence of a wind and magnetospheric accretion in S CrA N.
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