Revealing the inclined circumstellar disk in the UX Orionis system KK Ophiuchi
Revealing the inclined circumstellar disk in the UX Orionis system KK Ophiuchi
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揭示 UX Orionis 系统 KK Ophiuchi 中倾斜的星周盘
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
P. Stee
中科院分区：
文献类型：
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作者：
A. Kreplin;G. Weigelt;S. Kraus;V. Grinin;K. Hofmann;M. Kishimoto;D. Schertl;L. Tambovtseva;J. Clausse;F. Massi;K. Perraut;P. Stee
目标。我们利用近红外 VLTI/AMBER 干涉仪研究了 UX Ori 型恒星 KK Oph 星周环境的内部亚 AU 区域。我们对星盘系统的倾角特别感兴趣，并使用这些信息来测试 UX Ori 恒星当前的标准图片。方法。我们使用 VLTI/AMBER 仪器记录了近红外 H 和 K 波段的光谱色散 (R 35) 干涉图。将导出的 KK Oph 的能见度、闭合相位和光谱能量分布与二维几何和辐射传输模型 (RADMC) 进行比较。结果。我们获得了四个不同位置角度的能见度。使用二维几何模型，我们得出对应于 70° 倾角的轴比 3:0。拟合的倾斜环模型导致环半径为 2:8 0:2 mas，对应于 160 pc 距离处的 0:44 0:03 AU，这大于针对 1500 K 的尘埃升华温度预测的 0:1 AU 的尘埃升华半径。我们导出的二维 RADMC 模型由倾斜角为 70 的星周盘和附加的尘埃包层组成。结论。 KK Oph 周围有 70° 倾斜圆盘的发现与在大倾角下看到 UX Ori 天体的预测一致，并且视线中的轨道云导致了观测到的变化。此外，我们的结果表明伴星 KK Oph B 的轨道和盘面是共面的。
Aims. We study the inner sub-AU region of the circumstellar environment of the UX Ori-type star KK Oph with near-infrared VLTI/AMBER interferometry. We are particularly interested in the inclination of the star-disk system, and we use this information to test the current standard picture for UX Ori stars. Methods. We recorded spectrally dispersed (R 35) interferograms in the near-infraredH andK bands with the VLTI/AMBER instrument. The derived visibilities, closure phases, and the spectral energy distribution of KK Oph were compared with two-dimensional geometric and radiative transfer models (RADMC). Results. We obtained visibilities at four di erent position angles. Using two-dimensional geometric models, we derive an axis ratio 3:0 corresponding to an inclination of 70 . A fitted inclined ring model leads to a ring radius of 2:8 0:2 mas, corresponding to 0:44 0:03 AU at a distance of 160 pc, which is larger than the dust sublimation radius of 0:1 AU predicted for a dust sublimation temperature of 1500 K. Our derived two-dimensional RADMC model consists of a circumstellar disk with an inclination angle of 70 and an additional dust envelope. Conclusions. The finding of an 70 inclined disk around KK Oph is consistent with the prediction that UX Ori objects are seen under large inclination angles, and orbiting clouds in the line of sight cause the observed variability. Furthermore, our results suggest that the orbit of the companion KK Oph B and the disk plane are coplanar.