THE DYNAMICALLY DISRUPTED GAP IN HD 142527
THE DYNAMICALLY DISRUPTED GAP IN HD 142527
复制标题
HD 142527 中的动态中断间隙
DOI：
10.1088/2041-8205/754/2/l31
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
B. Ercolano
中科院分区：
文献类型：
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作者：
S. Casassus;S. Perez M.;A. Jord'an;F. M'enard;J. Cuadra;M. Schreiber;A. Hales;B. Ercolano
行星形成的痕迹已经在含有年轻的和巨大的气态巨行星的碎片盘中被观察到。巨行星的形成过程因原行星盘中气体的耗散而终止。HD 142527周围的富含气体的圆盘具有较小的内盘，从~ 10到~ 140 AU之间的大间隙，以及向外延伸到~ 300 AU的巨大外盘。这个缺口可能是由一颗巨大的行星造成的。我们已经用双子座南部的自适应光学相机NICI对这个间隙的外部区域进行了成像。我们的图像显示磁盘是动态扰动的。这个大致椭圆形的间隙的外边界似乎是由几段螺旋臂组成的。恒星位置偏移0。″17±0。″02从空洞的质心中提取，与早期较粗分辨率的成像一致。这些短暂的形态特征是预期在磁盘进化的背景下，在一个位于腔内的扰动体存在。我们对圆盘间隙的动态清除进行了流体动力学模拟。在r = 90天文单位的圆形轨道上，一个10兆跳的天体会扰动整个圆盘，即使在数千个轨道之后也是如此。到那时，模型盘已经有了一个偏心和不规则的空腔，两侧是紧密缠绕的螺旋臂，但它仍然远离稳定状态。一个特殊的瞬态结构与HD 142527的质量匹配，在1.7 Myr可见。
The vestiges of planet formation have been observed in debris disks harboring young and massive gaseous giants. The process of giant planet formation is terminated by the dissipation of gas in the protoplanetary disk. The gas-rich disk around HD 142527 features a small inner disk, a large gap from ∼10 to ∼140 AU, and a massive outer disk extending out to ∼300 AU. The gap could have been carved out by a giant planet. We have imaged the outer regions of this gap using the adaptive optics camera NICI on Gemini South. Our images reveal that the disk is dynamically perturbed. The outer boundary of the roughly elliptical gap appears to be composed of several segments of spiral arms. The stellar position is offset by 0.″17 ± 0.″02 from the centroid of the cavity, consistent with earlier imaging at coarser resolutions. These transient morphological features are expected in the context of disk evolution in the presence of a perturbing body located inside the cavity. We perform hydrodynamical simulations of the dynamical clearing of a gap in a disk. A 10 Mjup body in a circular orbit at r = 90 AU perturbs the whole disks, even after thousands of orbits. By then the model disk has an eccentric and irregular cavity, flanked by tightly wound spiral arms, but it is still evolving far from steady state. A particular transient configuration that is a qualitative match to HD 142527 is seen at 1.7 Myr.
双子座 NICI 行星搜寻活动：发现年轻碎片盘恒星 PZ Tel 的近恒星伴星
DOI：
10.1088/2041-8205/720/1/l82
发表时间：
2010
期刊：
The Astrophysical Journal
影响因子：
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作者：
Biller B
通讯作者：
Biller B