Discovery of Extreme Asymmetry in the Debris Disk Surrounding HD 15115
Discovery of Extreme Asymmetry in the Debris Disk Surrounding HD 15115
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HD 15115 周围碎片盘中发现极度不对称
DOI：
10.1086/518652
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
J. Graham
中科院分区：
文献类型：
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作者：
P. Kalas;M. Fitzgerald;J. Graham
我们报告了使用哈勃太空望远镜在光学方面和凯克自适应光学器件在近红外方面首次对 F2 V 星 HD 15115 周围的尘埃碎片盘进行散射光探测。相对于其他碎片盘，HD 15115 盘最显着的特性是其极端的长度不对称性。检测到圆盘东侧的半径约为 315 个天文单位，而圆盘西侧的半径大于 550 个天文单位。我们发现相对于恒星的蓝色光学到近红外散射光颜色表明与 AU Mic 碎片盘类似的颗粒散射特性。 HD 15115 周围的大型碎片盘的存在进一步证明了 β Pic 移动群的成员身份，此前仅根据运动学对此进行了争论。在这里，我们假设极端的盘不对称性是由于 HIP 12545 的动力学扰动造成的，HIP 12545 是 HD 15115 以东的一颗 M 星，具有共同的自行向量、日心距离、银河空间速度和年龄。
We report the first scattered light detection of a dusty debris disk surrounding the F2 V star HD 15115 using the Hubble Space Telescope in the optical and Keck adaptive optics in the near-infrared. The most remarkable property of the HD 15115 disk relative to other debris disks is its extreme length asymmetry. The east side of the disk is detected to ~315 AU radius, whereas the west side of the disk has radius >550 AU. We find a blue optical to near-infrared scattered light color relative to the star that indicates grain scattering properties similar to the AU Mic debris disk. The existence of a large debris disk surrounding HD 15115 adds further evidence for membership in the β Pic moving group, which was previously argued based on kinematics alone. Here we hypothesize that the extreme disk asymmetry is due to dynamical perturbations from HIP 12545, an M star east of HD 15115 that shares a common proper motion vector, heliocentric distance, galactic space velocity, and age.