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arXiv 1902.00720astro-ph.SRastro-ph.EPastro-ph.GA
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AB系统HD 100453的ALMA研究和伴星与盘的潮汐相互作用

ALMA study of the HD 100453 AB system and the tidal interaction of the companion with the disk

G. van der Plas, F. Ménard, J. -F. Gonzalez, S. Perez, L. Rodet, C. Pinte, L. Cieza, S. Casassus, M. Benisty

摘要:

内容:复杂系统HD 100453 AB具有一个环状的主盘和两个螺旋臂,其中一个指向次级,是检验螺旋形成理论的一个很好的实验室。目的:量化HD 100453 B与主盘周围的相互作用。研究方法:利用ALMA 6波段尘埃连续谱和CO同位素观测,我们研究了HD 100453 AB系统,其空间分辨率为0.09”× 0.17”,频率为234 GHz。我们使用SPH模拟和轨道拟合来研究伴星对盘面的潮汐影响。结果:我们将HD 100453 A周围的连续发射解析为0.22”和0.40”之间的圆盘,倾角为29.5度。以及151.0 °的位置角,一个未解决的内部磁盘,和多余的毫米发射共空间与北旋臂,这是以前检测到使用散射光观测。我们还检测到CO发射从7 au(在盘腔中)到1.10”,即,至少在投影上与HD 100453 B重叠。外CO盘PA和倾角相差达10度。从内部CO盘和尘埃连续辐射的值,我们解释为由于重力与HD 100453 B的相互作用。CO盘的空间范围和在北旋臂相同位置探测到的毫米辐射都与先前提出的HD 100453 B的近共面轨道不一致。结论:我们得出结论,HD 100453 B有一个轨道,是显着不对准的circumprimary磁盘。由于目前还不清楚这样的轨道是否可以解释所观察到的系统几何形状,我们强调了另一种情况,解释所有检测到的磁盘功能,另一个(尚未)检测到的,低质量的密切合作伙伴在磁盘腔,牧羊犬错位的内部磁盘的缓慢旋进的阴影激发螺旋臂。

英文摘要:

Context: The complex system HD 100453 AB with a ring-like circumprimary disk and two spiral arms, one of which is pointing to the secondary, is a good laboratory to test spiral formation theories. Aims: To quantify the interaction of HD 100453 B with the circumprimary disk. Methods: Using ALMA band 6 dust continuum and CO isotopologue observations we study the HD 100453 AB system with a spatial resolution of 0.09" x 0.17" at 234 GHz. We use SPH simulations and orbital fitting to investigate the tidal influence of the companion on the disk. Results: We resolve the continuum emission around HD 100453 A into a disk between 0.22" and 0.40" with an inclination of 29.5 deg. and a position angle of 151.0 deg., an unresolved inner disk, and excess mm emission cospatial with the northern spiral arm which was previously detected using scattered light observations. We also detect CO emission from 7 au (well within the disk cavity) out to 1.10", i.e., overlapping with HD 100453 B at least in projection. The outer CO disk PA and inclination differ by up to 10 deg. from the values found for the inner CO disk and the dust continuum emission, which we interpret as due to gravitational interaction with HD 100453 B. Both the spatial extent of the CO disk and the detection of mm emission at the same location as the northern spiral arm are in disagreement with the previously proposed near co-planar orbit of HD 100453 B. Conclusions: We conclude that HD 100453 B has an orbit that is significantly misaligned with the circumprimary disk. Because it is unclear whether such an orbit can explain the observed system geometry we highlight an alternative scenario that explains all detected disk features where another, (yet) undetected, low mass close companion within the disk cavity, shepherds a misaligned inner disk whose slowly precessing shadows excite the spiral arms.

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