Multi-band Photometry of Trans-Neptunian Objects in the Subaru Hyper Suprime-Cam Survey
Multi-band Photometry of Trans-Neptunian Objects in the Subaru Hyper Suprime-Cam Survey
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DOI：
10.1093/pasj/psx105
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发表时间：
2017-04
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影响因子：
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通讯作者：
T. Terai;F. Yoshida;K. Ohtsuki;P. S. Lykawka;N. Takato;A. Higuchi;Takashi Ito;Y. Komiyama;S. Miyazaki;Shiang‐Yu Wang
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文献类型：
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作者：
T. Terai;F. Yoshida;K. Ohtsuki;P. S. Lykawka;N. Takato;A. Higuchi;Takashi Ito;Y. Komiyama;S. Miyazaki;Shiang‐Yu Wang
本文介绍了2014年3月至2016年9月在斯巴鲁战略计划（HSC-SSP）框架下由斯巴鲁望远镜观测到的海王星外天体（TNOs）的可见多波段测光。我们测量了五个宽带（g，r，i，z和Y）颜色的波长范围从0.4 μ m到1.0 μ m的30个已知的TNO使用HSC-SSP调查数据覆盖约500 deg 2的天空+/-30度的黄道纬度。该数据集使我们能够基于可见光反射光谱来表征动力学类别，并检查颜色与其他参数（如轨道要素）之间的关系。我们的研究结果表明，热经典和散射人口共享相似的颜色分布，而冷经典人口有一个反射减少向短波长以下的i带。基于所获得的颜色特性，我们发现，在本工作中检查的TNO样品可以分为两组倾斜（I），低I人口组成的冷经典对象和高I人口组成的热经典和散射对象。整个样本的颜色和倾角之间表现出反相关，但没有显着的相关性之间的颜色和半长轴，近日点距离，离心率，或绝对星等。颜色-倾斜度相关性在整个倾斜度范围内似乎不是连续的。相反，它只出现在高I人群中。我们发现，低-和高-I人口是可区分的g-i与偏心率图，但四个高-I对象显示g-i颜色类似的低-I人口。如果我们排除这四个对象，高I对象之间的g-i和偏心率和g-i之间的负相关性与高显着性水平的倾斜度之间的正相关。
We present a visible multi-band photometry of trans-Neptunian objects (TNOs) observed by the Subaru Telescope in the framework of Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) from March in 2014 to September in 2016. We measured the five broad-band (g, r, i, z, and Y) colors over the wavelength range from 0.4 um to 1.0 um for 30 known TNOs using the HSC-SSP survey data covering ~500 deg2 of sky within +/-30 deg of ecliptic latitude. This dataset allows us to characterize the dynamical classes based on visible reflectance spectra as well as to examine the relationship between colors and the other parameters such as orbital elements. Our results show that the hot classical and scattered populations share similar color distributions, while the cold classical population has a reflective decrease toward shorter wavelength below the i band. Based on the obtained color properties, we found that the TNO sample examined in the present work can be separated into two groups by inclination (I), the low-I population consisting of cold classical objects and high-I population consisting of hot classical and scattered objects. The whole sample exhibits an anti-correlation between colors and inclination, but no significant correlation between colors and semi-major axis, perihelion distance, eccentricity, or absolute magnitude. The color-inclination correlation does not seem to be continuous over the entire inclination range. Rather, it is seen only in the high-I population. We found that the low- and high-I populations are distinguishable in the g-i vs. eccentricity plot, but four high-I objects show g-i colors similar to those of the low-I population. If we exclude these four objects, the high-I objects show a positive correlation between g-i and eccentricity and a negative correlation between g-i and inclination with high significance levels.