与成熟的经典金牛T星PDS 66有关的原行星盘的时代错误的颗粒生长和全球结构
Anachronistic Grain Growth and Global Structure of the Protoplanetary Disk Associated with the Mature Classical T Tauri Star, PDS 66
摘要：
我们提出ATCA干涉观测的老（13万年），附近（86秒差距）的经典金牛座T星，PDS 66。未解决的3和12毫米的连续发射探测到PDS 66，并得出上限为3和6厘米的通量密度。毫米波数据显示光谱斜率比ISM大小的尘埃颗粒预期的更平坦，这是颗粒生长的证据。我们还提出了HST/NICMOS 1.1微米PSF减去PDS 66的冠状成像。哈勃望远镜的观测揭示了一个左右对称的拱星区域，尘埃散射了大约0.32%的中央星光，表面亮度呈径向下降。材料的光散射盘从正面倾斜32度，并延伸到170 AU的半径。这些数据与已发表的光学和较长波长的观测相结合，使金牛座和PDS 66光谱能量分布（SED）的中位数之间的定性比较。通过比较近红外发射到一个简单的模型，我们确定的位置的内部磁盘半径是一致的尘埃升华半径（1400 K，0.1 AU）。我们使用一个平盘模型的总盘质量的限制，并发现它可能是太低，形成气体巨行星根据目前的模型。尽管PDS 66比典型的经典金牛座T星（<500万年）要古老得多，但它的物理性质并没有太大的不同。
英文摘要：
We present ATCA interferometric observations of the old (13 Myr), nearby (86pc) classical T Tauri star, PDS 66. Unresolved 3 and 12 mm continuum emission is detected towards PDS 66, and upper limits are derived for the 3 and 6 cm flux densities. The mm-wave data show a spectral slope flatter than that expected for ISM-sized dust particles, which is evidence of grain growth. We also present HST/NICMOS 1.1 micron PSF-subtracted coronagraphic imaging of PDS 66. The HST observations reveal a bilaterally symmetric circumstellar region of dust scattering about 0.32% of the central starlight, declining radially in surface brightness. The light-scattering disk of material is inclined 32 degrees from face-on, and extends to a radius of 170 AU. These data are combined with published optical and longer wavelength observations to make qualitative comparisons between the median Taurus and PDS 66 spectral energy distributions (SEDs). By comparing the near-infrared emission to a simple model, we determine that the location of the inner disk radius is consistent with the dust sublimation radius (1400 K at 0.1 AU). We place constraints on the total disk mass using a flat-disk model and find that it is probably too low to form gas giant planets according to current models. Despite the fact that PDS 66 is much older than a typical classical T Tauri star (< 5 Myr), its physical properties are not much different.
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