A study of dust properties in the inner sub-au region of the Herbig Ae star HD 169142 with VLTI/PIONIER

A study of dust properties in the inner sub-au region of the Herbig Ae star HD 169142 with VLTI/PIONIER
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利用 VLTI/PIONIER 研究 Herbig Ae 星 HD 169142 内部亚金区域的尘埃特性

DOI:
10.1051/0004-6361/201731627
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发表时间:
2018
影响因子:
6.5
通讯作者:
Chen L
Chen L
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Chen L

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理解原行星演化的一个重要步骤是研究包含间隙或内部孔的圆盘。Herbig星星HD 169142周围的前过渡盘在过去的几十年中表现出多能隙盘结构、差异化的气体和尘埃分布、行星候选者以及近红外衰落,这些使其成为盘演化案例研究的有价值的目标。我们的目标是在2011 - 2013年研究盘的内部亚AU区域的尘埃性质,当物体已经在其附近时,红外微弱状态。MethodsWe首先进行简单的几何建模来表征NIR发射区域的大小和形状。然后,我们进行了蒙特-卡罗辐射传输模拟网格的模型和比较的干涉和测光observation.ResultsWe发现,观测是一致的光学薄灰色尘埃躺在Rin ~ 0.07 Au,被动加热到T ~ 1500 K。具有亚微米光学薄灰尘的模型被排除在外,因为这种灰尘在相似的距离下将被加热到更高的温度。观测结果也可以用一个由光学厚尘埃atRin~ 0.06 Au组成的模型来重现,但这个模型只有在内部盘中存在耐高温尘埃物种时才是合理的。
ContextAn essential step to understanding protoplanetary evolution is the study of disks that contain gaps or inner holes. The pre-transitional disk around the Herbig star HD 169142 exhibits multi-gap disk structure, differentiated gas and dust distribution, planet candidates, and near-infrared fading in the past decades, which make it a valuable target for a case study of disk evolution.AimsUsing near-infrared interferometric observations with VLTI/PIONIER, we aim to study the dust properties in the inner sub-au region of the disk in the years 2011−2013, when the object is already in its near-infrared faint state.MethodsWe first performed simple geometric modeling to characterize the size and shape of the NIR-emitting region. We then performed Monte-Carlo radiative transfer simulations on grids of models and compared the model predictions with the interferometric and photometric observations.ResultsWe find that the observations are consistent with optically thin gray dust lying atRin~ 0.07 au, passively heated toT~ 1500 K. Models with sub-micron optically thin dust are excluded because such dust will be heated to much higher temperatures at similar distance. The observations can also be reproduced with a model consisting of optically thick dust atRin~ 0.06 au, but this model is plausible only if refractory dust species enduring ~ 2400 K exist in the inner disk.
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