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arXiv 0911.3445astro-ph.SR
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HV Tau C边缘盘的全色观测和模拟

Panchromatic observations and modeling of the HV Tau C edge-on disk

G. Duchene, C. McCabe, C. Pinte, K. R. Stapelfeldt, F. Menard, G. Duvert, A. M. Ghez, H. L. Maness, H. Bouy, D. Barrado y Navascues, M. Morales-Calderon, S. Wol… 展开作者

G. Duchene, C. McCabe, C. Pinte, K. R. Stapelfeldt, F. Menard, G. Duvert, A. M. Ghez, H. L. Maness, H. Bouy, D. Barrado y Navascues, M. Morales-Calderon, S. Wolf, D. L. Padgett, T. Y. Brooke, A. Noriega-Crespo

摘要:

我们提出了新的高空间分辨率(<0.1”)1-5微米自适应光学图像,干涉1.3毫米连续和12 CO 2-1地图,和350微米,2.8和3.3毫米的HV Tau系统的通量测量。我们的自适应光学图像揭示了一个异常缓慢的轨道运动内紧HV头AB对,这表明一个高度偏心的轨道和/或一个大的deprojected物理分离。HV Tau C边缘上原行星盘的散射光图像表明,尘埃散射相函数的各向异性几乎与波长无关,从0.8到5微米,而尘埃不透明度在同一范围内显着降低。这些图像进一步揭示了一个明显的横向不对称的磁盘,不改变超过2年的时间尺度。我们进一步检测到径向速度梯度的磁盘在我们的12 CO地图,位于沿相同的位置角的连续辐射的延长,这是一致的开普勒旋转围绕0.5-1 Msun中心恒星,这表明它可能是最大的组成部分在三重系统。我们使用一个强大的辐射转移模型来计算合成磁盘的观测,并使用贝叶斯推断方法来提取磁盘属性的约束。每一个单独的图像,以及光谱能量分布,HV Tau C可以很好地再现我们的模型与完全混合的尘埃颗粒生长已经产生大于星际尘埃颗粒。然而,没有一个单一的模型可以令人满意地同时考虑所有的观察。我们建议,未来的尝试,以模拟这种来源,包括更复杂的灰尘属性和可能的垂直分层。(节录)

英文摘要:

We present new high spatial resolution (<~ 0.1") 1-5 micron adaptive optics images, interferometric 1.3 mm continuum and 12CO 2-1 maps, and 350 micron, 2.8 and 3.3 mm fluxes measurements of the HV Tau system. Our adaptive optics images reveal an unusually slow orbital motion within the tight HV Tau AB pair that suggests a highly eccentric orbit and/or a large deprojected physical separation. Scattered light images of the HV Tau C edge-on protoplanetary disk suggest that the anisotropy of the dust scattering phase function is almost independent of wavelength from 0.8 to 5 micron, whereas the dust opacity decreases significantly over the same range. The images further reveal a marked lateral asymmetry in the disk that does not vary over a timescale of 2 years. We further detect a radial velocity gradient in the disk in our 12CO map that lies along the same position angle as the elongation of the continuum emission, which is consistent with Keplerian rotation around an 0.5-1 Msun central star, suggesting that it could be the most massive component in the triple system. We use a powerful radiative transfer model to compute synthetic disk observations and use a Bayesian inference method to extract constraints on the disk properties. Each individual image, as well as the spectral energy distribution, of HV Tau C can be well reproduced by our models with fully mixed dust provided grain growth has already produced larger-than-interstellar dust grains. However, no single model can satisfactorily simultaneously account for all observations. We suggest that future attempts to model this source include more complex dust properties and possibly vertical stratification. (Abridged)

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