HD 163296的毫米成像：探测椎间盘结构和运动学
Millimeter imaging of HD 163296: probing the disk structure and kinematics
摘要：
我们提出了新的多波长毫米波干涉观测Herbig Ae星HD 163296获得的IRAM/PBI，SMA和VLA阵列在连续和在12 CO，13 CO和C18 O发射线。气体和尘埃的性质已经得到比较的观测与自洽磁盘模型的灰尘和CO排放。的拱盘解决在连续和CO。我们发现强有力的证据表明，拱材料是在开普勒旋转围绕中央恒星的2.6 Msun。盘相对于视线的倾斜度为46 ± 4度，位置角为128 ± 4度。在0.87和7 mm（β =1）之间测量的尘埃不透明度的斜率证实了在圆盘中平面中存在mm/cm尺寸的颗粒。尘埃的连续辐射是不对称的，局限在200 AU的半径内，而CO的辐射延伸到540 AU。尘埃和CO温度之间的比较表明，CO只存在于磁盘内部。最后，我们得到一个增加亏损的CO同位素从12 CO到13 CO和C18 O。我们认为，这些结果支持的想法，硬盘HD 163296是强烈的演变。特别是，我们认为，有一个强大的耗尽的尘埃相对于气体以外的200 AU，这可能是由于向内迁移的大型机构，形成在外盘或清除一个大的差距，在尘埃分布的低质量的同伴。
英文摘要：
We present new multi-wavelength millimeter interferometric observations of the Herbig Ae star HD 163296 obtained with the IRAM/PBI, SMA and VLA arrays both in continuum and in the 12CO, 13CO and C18O emission lines. Gas and dust properties have been obtained comparing the observations with self-consistent disk models for the dust and CO emission. The circumstellar disk is resolved both in the continuum and in CO. We find strong evidence that the circumstellar material is in Keplerian rotation around a central star of 2.6 Msun. The disk inclination with respect to the line of sight is 46+-4 deg with a position angle of 128+-4 deg. The slope of the dust opacity measured between 0.87 and 7 mm (beta=1) confirms the presence of mm/cm-size grains in the disk midplane. The dust continuum emission is asymmetric and confined inside a radius of 200 AU while the CO emission extends up to 540 AU. The comparison between dust and CO temperature indicates that CO is present only in the disk interior. Finally, we obtain an increasing depletion of CO isotopomers from 12CO to 13CO and C18O. We argue that these results support the idea that the disk of HD 163296 is strongly evolved. In particular, we suggest that there is a strong depletion of dust relative to gas outside 200 AU; this may be due to the inward migration of large bodies that form in the outer disk or to clearing of a large gap in the dust distribution by a low mass companion.
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