High-resolution Submillimeter and Near-infrared Studies of the Transition Disk around Sz 91
High-resolution Submillimeter and Near-infrared Studies of the Transition Disk around Sz 91
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Sz 91 周围过渡盘的高分辨率亚毫米和近红外研究
DOI：
10.1088/0004-637x/783/2/90
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
et al. (No. 33 of 58 authors)
中科院分区：
文献类型：
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作者：
Tsukagoshi;T.;Momose;M.;Hashimoto;J.;et al. (No. 33 of 58 authors)
为了揭示狼座Sz 91中一个年轻恒星物体周围的过渡盘的结构，我们使用亚毫米阵列（~ 1”-3”分辨率）进行了孔径合成345 GHz连续体和CO（3-2）观测，并使用斯巴鲁望远镜上的HiCIAO仪器（0 farcs 25分辨率）进行了K波段偏振强度的高分辨率成像。我们的观测成功地确定了尘埃盘的内部和外部半径分别为65和170 AU，这表明Sz 91是一个过渡盘源，拥有已知最大的内孔之一。光谱能量分布的模型拟合分析显示，在65 AU< r< 170 AU的冷（T< 30 K）外层，假设典型的气体与尘埃质量比为100，h2质量为2.4× 10−3 M☉，尽管少量（bbb3 × 10−9 M☉）的热（T ~ 180 K）尘埃可能留在盘的内孔内。热成分的结构可以解释为一个未解析的自发光伴体（在我们的观测中没有直接检测到）或一个内孔内的窄环。显著的CO（3-2）辐射沿尘埃盘长轴呈速度梯度，集中在Sz 91位置，表明这是一个半径为420 AU的旋转气体盘。Sz 91盘可能是一个罕见的盘，在原行星形成后立即处于进化阶段，因为它的内部洞很大，盘质量比迄今为止研究的其他过渡盘要低。
To reveal the structures of a transition disk around a young stellar object in Lupus, Sz 91, we have performed aperture synthesis 345 GHz continuum and CO (3–2) observations with the Submillimeter Array (∼ 1''–3''resolution) and high-resolution imaging of polarized intensity at the K s-band using the HiCIAO instrument on the Subaru Telescope (0 farcs 25 resolution). Our observations successfully resolved the inner and outer radii of the dust disk to be 65 and 170 AU, respectively, which indicates that Sz 91 is a transition disk source with one of the largest known inner holes. The model fitting analysis of the spectral energy distribution reveals an H 2 mass of 2.4× 10− 3 M☉ in the cold (T< 30 K) outer part at 65 AU< r< 170 AU by assuming a canonical gas-to-dust mass ratio of 100, although a small amount (> 3× 10− 9 M☉) of hot (T∼ 180 K) dust possibly remains inside the inner hole of the disk. The structure of the hot component could be interpreted as either an unresolved self-luminous companion body (not directly detected in our observations) or a narrow ring inside the inner hole. Significant CO (3–2) emission with a velocity gradient along the major axis of the dust disk is concentrated on the Sz 91 position, suggesting a rotating gas disk with a radius of 420 AU. The Sz 91 disk is possibly a rare disk in an evolutionary stage immediately after the formation of protoplanets because of the large inner hole and the lower disk mass than other transition disks studied thus far.