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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Extreme asymmetry in the polarized disk of V1247 Orionis
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Extreme asymmetry in the polarized disk of V1247 Orionis

机译：V1247 Orionis偏振片中的极端不对称

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摘要

We present the first near-infrared scattered-light detection of the transitional disk around V1247 Ori, which was obtained using high-resolution polarimetric differential imaging observations with Subaru/HiCIAO. Our imaging in the H band reveals the disk morphology at separations of similar to 0.'' 14-0.'' 86 (54-330 au) from the central star. The polarized intensity image shows a remarkable arc-like structure toward the southeast of the star, whereas the fainter northwest region does not exhibit any notable features. The shape of the arm is consistent with an arc of 0.'' 28 +/- 0.'' 09 in radius (108 au from the star), although the possibility of a spiral arm with a small pitch angle cannot be excluded. V1247 Ori features an exceptionally large azimuthal contrast in scattered, polarized light; the radial peak of the southeastern arc is about three times brighter than the northwestern disk measured at the same distance from the star. Combined with the previous indication of an inhomogeneous density distribution in the gap at less than or similar to 46 au, the notable asymmetry in the outer disk suggests the presence of unseen companions and/or planet-forming processes ongoing in the arc.
机译：我们介绍了V1247 Ori附近过渡盘的第一个近红外散射光检测，该检测是通过使用Subaru / HiCIAO的高分辨率偏光差分成像观察获得的。我们在H波段的成像揭示了与中心恒星相距0''14-0''86（54-330 au）的圆盘形态。极化强度图像在恒星东南方向显示出明显的弧状结构，而较弱的西北区域则没有任何显着特征。臂的形状与半径为0''（28）+/- 0''（09）的弧（距恒星108 au）相一致，尽管不能排除螺距角较小的可能性。 V1247 Ori在散射的偏振光中具有非常大的方位角对比度。在距恒星相同距离处测得的东南弧的径向峰值大约是西北圆盘的三倍。结合先前的迹象表明间隙中的密度分布小于或等于46 au，外圆盘中明显的不对称性表明弧中正在进行看不见的伴随和/或行星形成过程。

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