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arXiv 1107.3153astro-ph.EPastro-ph.SR
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HR 8799和HD 107146碎片探测器的分辨亚毫米观测

Resolved Submillimeter Observations of the HR 8799 and HD 107146 Debris Disks

A. Meredith Hughes, David J. Wilner, Sean M. Andrews, Jonathan P. Williams, Kate Y. L. Su, Ruth A. Murray-Clay, Chunhua Qi

摘要:

我们提出了880微米的亚毫米波阵列观测的碎片盘周围的年轻的太阳类似物HD 107146和多行星的主恒星HR 8799,在角分辨率为3”和6”,分别。首次对HR 8799周围的盘内缘进行了空间分辨。虽然数据不够敏感(均方根噪声为1 mJy),无法约束系统几何形状,但我们证明了Su等人(2009)基于光谱能量分布(SED)的模型(内径为150 AU)可以很好地预测空间分辨数据。此外,通过同时建模的SED和vibrium,我们表明,灰尘分布在一个广泛的(100 AU的顺序)环,而不是一个狭窄的环。我们还为HD 107146碎片盘模拟了所观察到的SED和vibrium,并生成了一个尘埃排放模型,该模型在距离恒星50至170 AU的宽带中延伸。我们进行了后验比较与现有的1.3毫米CARMA观测,并证明了一个光滑的,轴对称的模型再现以及所有可用的毫米波长的数据。

英文摘要:

We present 880 um Submillimeter Array observations of the debris disks around the young solar analogue HD 107146 and the multiple-planet host star HR 8799, at an angular resolution of 3" and 6", respectively. We spatially resolve the inner edge of the disk around HR 8799 for the first time. While the data are not sensitive enough (with rms noise of 1 mJy) to constrain the system geometry, we demonstrate that a model by Su et al. (2009) based on the spectral energy distribution (SED) with an inner radius of 150 AU predicts well the spatially resolved data. Furthermore, by modeling simultaneously the SED and visibilities, we demonstrate that the dust is distributed in a broad (of order 100 AU) annulus rather than a narrow ring. We also model the observed SED and visibilities for the HD 107146 debris disk and generate a model of the dust emission that extends in a broad band between 50 and 170 AU from the star. We perform an a posteriori comparison with existing 1.3 mm CARMA observations and demonstrate that a smooth, axisymmetric model reproduces well all of the available millimeter-wavelength data.

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