论文标题
在Di Cha A磁盘中1 Au处的缝隙，红外干涉测量法揭示了
A gap at 1 au in the disk of DI Cha A revealed by infrared interferometry
论文作者
论文摘要
di cha a是K0型前序列星，这是四恒星恒星系统的最亮组成部分。在这里，我们根据档案VLTI/MIDI和VLTI/PIONIER红外干涉测量值以及光学的光度监测，从地面和太空出生的仪器中进行了光学测光监测。我们使用分析模型和辐射传递代码radmc-3d同时拟合干涉可见性和光谱能量分布来确定偶色磁盘的结构。该建模表明，磁盘的径向密度分布似乎在0.21和3.0 au之间的间隙。内环与升华半径相吻合，没有小的亚微米大小的灰尘颗粒。外盘的内边缘具有膨化的边缘，通常在中间质量恒星中看到。谷物生长虽然进展较少，但在外盘中也被检测到。内环在每日和年度时间尺度上的中红外波长处是可变的，而恒星在光学上保持恒定，指向磁盘中磁盘上的几何或积聚变化，这可能是通量变化的解释。
DI Cha A is K0-type pre-main sequence star, the brightest component of a quadruple stellar system. Here we report on a detailed study of this star based on archival VLTI/MIDI and VLTI/PIONIER infrared interferometric observations, as well as optical--infrared photometric monitoring from ground-based and space-born instruments. We determined the structure of the circumstellar disk by fitting simultaneously the interferometric visibilities and the spectral energy distribution, using both analytical models and the radiative transfer code RADMC-3D. The modeling revealed that the radial density distribution of the disk appears to have a gap between 0.21 and 3.0 au. The inner ring, whose inner size coincides with the sublimation radius, is devoid of small, submicrometer-sized dust grains. The inner edge of the outer disk features a puffed-up rim, typically seen in intermediate-mass stars. Grain growth, although less progressed, was also detected in the outer disk. The inner ring is variable at mid-infrared wavelengths on both daily and annual timescales, while the star stays remarkably constant in the optical, pointing to geometrical or accretion changes in the disk as possible explanation for the flux variations.
