Title: Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): Characterization of the young star T CrA and its circumstellar environment Show Chinese title

Title: 通过附近年轻恒星成像研究盘演化（DESTINYS）：T CrA年轻恒星及其星周环境的特征研究

Abstract: Birth environments of young stars have strong imprints on the star itself and their surroundings. We present a detailed analysis of the wealthy circumstellar environment around the young Herbig Ae/Be star TCrA. Our aim is to understand the nature of the stellar system and the extended circumstellar structures as seen in scattered light images. We conduct our analysis combining archival data, and new adaptive optics high-contrast and high-resolution images. The scattered light images reveal the presence of a complex environment composed of a bright forward scattering rim of the disk's surface that is seen at very high inclination, a dark lane of the disk midplane, bipolar outflows, and streamer features likely tracing infalling material from the surrounding birth cloud onto the disk. The analysis of the light curve suggests the star is a binary with a period of 29.6yrs. The comparison of the scattered light images with ALMA continuum and 12CO line emission shows the disk is in keplerian rotation, with the northern side of the outflowing material receding, while the southern side approaching the observer. The disk is itself seen edge-on. The direction of the outflows seen in scattered light is in agreement with the direction of the more distant molecular hydrogen emission-line objects (MHOs) associated to the star. Modeling of the SED using a radiative transfer scheme well agrees with the proposed configuration, as well as the hydrodynamical simulation performed using a Smoothed Particle Hydrodynamics code. We find evidence of streamers of accreting material around TCrA. These streamers connect the filament along which TCrA is forming with the outer parts of the disk, suggesting that the strong misalignment between the inner and outer disk is due to a change in the direction of the angular momentum of the material accreting on the disk during the late phase of star formation. Show Chinese abstract

Abstract: 年轻恒星的诞生环境对其自身及其周围环境有很强的印记。 我们对年轻的赫比格Ae/Be型恒星TCrA周围的丰富星周环境进行了详细分析。 我们的目标是理解恒星系统及其在散射光图像中看到的扩展星周结构的本质。 我们结合存档数据和新的自适应光学高对比度、高分辨率图像来进行我们的分析。 散射光图像揭示了一个复杂的环境，包括盘表面明亮的前向散射边缘（从非常高的倾斜角度看到）、盘中平面的暗带、双极喷流以及可能追踪来自周围诞生云物质向盘内落的流线特征。 光变曲线的分析表明这颗恒星是一个周期为29.6年的双星系统。 与ALMA连续谱和12CO线发射的散射光图像比较显示，盘处于开普勒旋转状态，喷出物质的北侧正在远离，而南侧则朝向观测者靠近。 盘本身是被观测为边缘方向。 散射光中看到的喷流方向与更远距离的分子氢发射线天体（MHOs）的方向一致。 使用辐射传递方案建模的SED很好地符合所提出的配置，以及用平滑粒子流体力学代码进行的流体力学模拟。 我们在TCrA周围发现了吸积物质的流线证据。 这些流线连接了TCrA形成的丝状物和盘的外部区域，表明内外盘之间的强烈错配是由于恒星形成晚期阶段盘上吸积物质角动量方向的变化造成的。