DR Tau: Temporal variability of the brightness distribution in the potential planet-forming region

DR Tau: Temporal variability of the brightness distribution in the potential planet-forming region
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DR Tau:潜在行星形成区域亮度分布的时间变化

DOI:
10.1051/0004-6361/201526691
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发表时间:
2016
期刊:
arXiv: Solar and Stellar Astrophysics
影响因子:
--
通讯作者:
F. Ober
F. Ober
中科院分区:
--
文献类型:
--
作者:
R. Bunngräber;S. Wolf;Th. Ratzka;F. Ober

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目的研究金牛座T型星星DR Tau周围原行星盘的亮度分布和密度结构的变化。DR Tau以其从紫外线(UV)到中红外线(MIR)的特殊变化而闻名。我们的目标是约束的时间变化的磁盘结构的基础上光度和MIR interferometric data.MethodsWe观察DR头与中红外干涉仪(MIDIR)在甚大望远镜干涉仪(VLTI)在三个时代分开约9年,两个月,分别。我们适合的光谱能量分布和MIR的可见度与辐射transmittingsimulation.ResultsWe是能够重现的光谱能量分布以及MIR的可见度为三个时代之一(第三时代)与一个基本的磁盘模型。我们能够重现九年前在非常相似的基线(第一个历元)下获得的非常不同的能见度曲线,使用相同的圆盘模型,具有较小的比例尺高度。同样的密度分布也再现了在第二个历元中以更高的空间分辨率进行的观测,即仅在第三个历元之前两个月。
AimsWe investigate the variability of the brightness distribution and the changing density structure of the protoplanetary disk around DR Tau, a classical T Tauri star. DR Tau is known for its peculiar variations from the ultraviolet (UV) to the mid-infrared (MIR). Our goal is to constrain the temporal variation of the disk structure based on photometric and MIR interferometric data.MethodsWe observed DR Tau with the MID-infrared Interferometric instrument (MIDI) at the Very Large Telescope Interferometer (VLTI) at three epochs separated by about nine years, two months, respectively. We fit the spectral energy distribution and the MIR visibilities with radiative transfer simulations.ResultsWe are able to reproduce the spectral energy distribution as well as the MIR visibility for one of the three epochs (third epoch) with a basic disk model. We were able to reproduce the very different visibility curve obtained nine years earlier with a very similar baseline (first epoch), using the same disk model with a smaller scale height. The same density distribution also reproduces the observation made with a higher spatial resolution in the second epoch, i.e. only two months before the third epoch.
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