围绕T Cha雕刻盘：干涉仪视图
Sculpting the disk around T Cha: an interferometric view
摘要：
（节略）星周盘被认为是行星的诞生地，并预计在几百万年的时间尺度上消散。负责去除粉尘和气体的过程将强烈改变粉尘的径向分布，从而改变SED。特别是，一个年轻的行星将打开一个缺口，导致内盘主导的近红外辐射和外盘发射主要是在远红外。我们分析了一套完整的数据（包括VLTI/Pionier，VLTI/Midi，和VLT/NaCo/Sam），以约束TCha周围的过渡盘的结构。我们使用的Mcfost辐射转移代码，同时模拟的SED和干涉观测。我们发现，在近红外过量的排放负责的灰尘必须有一个狭窄的温度分布，最大接近硅酸盐升华温度。这意味着一个狭窄的内部尘埃盘（0.07-0.11 AU）。我们发现，外盘开始在约12 AU，部分解决了Pionier，山姆，和Midi仪器。我们表明，山姆封闭阶段，解释为候选同伴的签名，实际上可以跟踪由尘埃颗粒在外盘上层的前向散射产生的不对称性。这些观测有助于限制外盘的倾角和位置角。间隙内物质的存在很难用今天的观测来评估。我们的模型表明，外盘污染的干涉签名的任何潜在的同伴，可能是负责间隙开放，这样的同伴仍然必须明确地检测。我们强调的困难，观察点源在明亮的大规模磁盘，以及随之而来的需要考虑磁盘的不对称性（例如各向异性散射）在模型相关的搜索同伴。
英文摘要：
(Abridged) Circumstellar disks are believed to be the birthplace of planets and are expected to dissipate on a timescale of a few Myr. The processes responsible for the removal of the dust and gas will strongly modify the radial distribution of the dust and consequently the SED. In particular, a young planet will open a gap, resulting in an inner disk dominating the near-IR emission and an outer disk emitting mostly in the far-IR. We analyze a full set of data (including VLTI/Pionier, VLTI/Midi, and VLT/NaCo/Sam) to constrain the structure of the transition disk around TCha. We used the Mcfost radiative transfer code to simultaneously model the SED and the interferometric observations. We find that the dust responsible for the emission in excess in the near-IR must have a narrow temperature distribution with a maximum close to the silicate sublimation temperature. This translates into a narrow inner dusty disk (0.07-0.11 AU). We find that the outer disk starts at about 12 AU and is partially resolved by the Pionier, Sam, and Midi instruments. We show that the Sam closure phases, interpreted as the signature of a candidate companion, may actually trace the asymmetry generated by forward scattering by dust grains in the upper layers of the outer disk. These observations help constrain the inclination and position angle of the outer disk. The presence of matter inside the gap is difficult to assess with present-day observations. Our model suggests the outer disk contaminates the interferometric signature of any potential companion that could be responsible for the gap opening, and such a companion still has to be unambiguously detected. We stress the difficulty to observe point sources in bright massive disks, and the consequent need to account for disk asymmetries (e.g. anisotropic scattering) in model-dependent search for companions.
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