在中红外线中将盘中的间隙尺寸约束在HD 100546附近
Constraining the gap size in the disk around HD 100546 in the mid-infrared
摘要：
我们改进的间隙大小测量的磁盘周围的Herbig Ae星HD 100546在N波段。我们新的中红外干涉仪（DIR）数据已经与UT基线一起拍摄，并跨越了整个方位范围。相关通量呈波浪形，其中最小分离与盘中的几何结构有关。我们用样条函数拟合每个相关的通量测量，导出相应的空间尺度，同时假设由于内盘和外盘壁的相对侧的明亮发射而干涉产生的图案。然后，我们将椭圆拟合到相应位置角处的衍生分离，从而使用观测结果将盘倾角限制为i =47 +/- 1度，将盘位置角限制为PA =135.0 +/- 2.5度，这两者都与先前研究中的估计值一致。我们还推导出椭圆的半径为15.7 +/- 0.8 au。为了确认最小分离转化为磁盘中的几何结构，我们使用半分析方法，考虑到温度和光学深度梯度的HD 100546的磁盘模型。使用这个模型，我们同时重现的水平和相关通量的最小值，并限制每个观察的磁盘的间隙大小。获得的不同方向上的投影间隙尺寸值与几何模型发现的间隔一致。
英文摘要：
We refine the gap size measurements of the disk surrounding the Herbig Ae star HD 100546 in the N band. Our new mid-infrared interferometric (MIDI) data have been taken with the UT baselines and span the full range of orientations. The correlated fluxes show a wavy pattern in which the minima separation links to a geometrical structure in the disk. We fit each correlated flux measurement with a spline function, deriving the corresponding spatial scale, while assuming that the pattern arises interferometrically due to the bright emission from the inner disk and the opposing sides of the wall of the outer disk. We then fit an ellipse to the derived separations at their corresponding position angles, thereby using the observations to constrain the disk inclination to i =47 +/- 1 degree and the disk position angle to PA =135.0 +/- 2.5 degree East of North, both of which are consistent with the estimated values in previous studies. We also derive the radius of the ellipse to 15.7 +/- 0.8 au. To confirm that the minima separations translate to a geometrical structure in the disk, we model the disk of HD 100546 using a semi-analytical approach taking into account the temperature and optical depth gradients. Using this model, we simultaneously reproduce the level and the minima of the correlated fluxes and constrain the gap size of the disk for each observation. The values obtained for the projected gap size in different orientations are consistent with the separation found by the geometrical model.
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