SR24三元系周围不对准晶体的SUBARU近红外成像偏振测量
SUBARU Near-Infrared Imaging Polarimetry of Misaligned Disks Around The SR24 Hierarchical Triple System
摘要：
SR 24多星型系统同时拥有环绕主盘和环绕次盘，它们彼此之间严重错位。周次生盘的性质是周双星。有趣的是，这两个圆盘相互作用，它们可能以相反的方向旋转。为了研究这种独特的双磁盘系统的性质，我们提出0。SR 24周围星周结构的1分辨率近红外偏振强度图像，由安装在Subaru 8.2米望远镜上的HiCIAO获得。主盘和副盘都被分辨出来，并具有细长的特征。SR 24 S周围的NIR偏振盘的长轴位置角和半径分别为55 $^{\circ}$和137 au，而SR 24 N周围的长轴位置角和半径分别为110 $^{\circ}$和34 au。就整体形态而言，SR 24 S周围的轮主盘显示出较强的不对称性，而SR 24 N周围的轮次盘显示出相对较强的对称性。我们的近红外观测结果证实了先前的说法，即环绕主星和环绕副星的圆盘彼此错位。在$^{12}$ CO观测中，周主盘和周次生盘在大小和伸长方向上显示出相似的结构。这种一致性是因为NIR和$^{12}$ CO都在追踪扩口盘的表面层。由于SR 24 N周围的偏振盘的半径与外罗氏瓣的大小大致一致，因此很自然地将SR 24 N周围的偏振盘解释为围绕SR 24 Nb-Nc系统的环双星盘。
英文摘要：
The SR24 multi-star system hosts both circumprimary and circumsecondary disks, which are strongly misaligned from each other. The circumsecondary disk is circumbinary in nature. Interestingly, both disks are interacting, and they possibly rotate in opposite directions. To investigate the nature of this unique twin disk system, we present 0.''1 resolution near-infrared polarized intensity images of the circumstellar structures around SR24, obtained with HiCIAO mounted on the Subaru 8.2 m telescope. Both the circumprimary disk and the circumsecondary disk are resolved and have elongated features. While the position angle of the major axis and radius of the NIR polarization disk around SR24S are 55$^{\circ}$ and 137 au, respectively, those around SR24N are 110$^{\circ}$ and 34 au, respectively. With regard to overall morphology, the circumprimary disk around SR24S shows strong asymmetry, whereas the circumsecondary disk around SR24N shows relatively strong symmetry. Our NIR observations confirm the previous claim that the circumprimary and circumsecondary disks are misaligned from each other. Both the circumprimary and circumsecondary disks show similar structures in $^{12}$CO observations in terms of its size and elongation direction. This consistency is because both NIR and $^{12}$CO are tracing surface layers of the flared disks. As the radius of the polarization disk around SR24N is roughly consistent with the size of the outer Roche lobe, it is natural to interpret the polarization disk around SR24N as a circumbinary disk surrounding the SR24Nb-Nc system.
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