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arXiv 1708.03079astro-ph.EP
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Col-OSSOS:z波段Photometry显示三种不同的TNO表面类型

Col-OSSOS: z Band Photometry Reveals Three Distinct TNO Surface Types

Rosemary E. Pike, Wesley C. Fraser, Megan E. Schwamb, JJ Kavelaars, Michael Marsset, Michele T. Bannister, Matthew J. Lehner, Shiang-Yu Wang, Mike Alexandersen,… 展开作者

Rosemary E. Pike, Wesley C. Fraser, Megan E. Schwamb, JJ Kavelaars, Michael Marsset, Michele T. Bannister, Matthew J. Lehner, Shiang-Yu Wang, Mike Alexandersen, Ying-Tung Chen, Brett J. Gladman, Stephen Gwyn, Jean-Marc Petit, Kathryn Volk

摘要:

几种不同类别的海王星外天体(TNO)已经根据它们的光学和近红外颜色被识别出来。作为外太阳系起源调查的颜色的一部分,我们已经获得了$g$,$r$和$z$波段测光的26个TNO使用斯巴鲁和双子座天文台。以前的颜色调查没有利用$z$波段反射率,包括这一波段揭示了显着的表面反射率的变化之间的亚种群。$g-r$和$r-z$中的TNO颜色显示出明显的结构,并且与先前在$g-r$中测量的双模态一致。两种动态激发表面类型的颜色分布可以使用来自Fraser \& Brown(2012)的双组分混合模型来建模。通过组合使用$g-r$和$r-z$,可以将动态激发类干净地分为红色和中性曲面类。在$g - r$和$r - z$中,两个动态激发的表面群也明显不同于冷的经典TNO表面,它们是红色的,$g-r\gtrsim$ 0.85和$r-z\lesssim$ 0.6,而所有具有相似$g-r$颜色的动态激发物体都表现出更红的$r-z$颜色。$z$带光度学首次使区分红色激发TNO表面和红色冷经典TNO表面成为可能。这些冷的经典TNO的不同的$r-z$颜色的发现使得有可能在柯伊伯带的其他区域中寻找冷的经典表面,并将冷的经典TNO从动态激发的人口中完全分离出来,这些人口在轨道参数空间中重叠。

英文摘要:

Several different classes of trans-Neptunian objects (TNOs) have been identified based on their optical and near-infrared colors. As part of the Colours of the Outer Solar System Origins Survey, we have obtained $g$, $r$, and $z$ band photometry of 26 TNOs using Subaru and Gemini Observatories. Previous color surveys have not utilized $z$ band reflectance, and the inclusion of this band reveals significant surface reflectance variations between sub-populations. The colors of TNOs in $g-r$ and $r-z$ show obvious structure, and appear consistent with the previously measured bi-modality in $g-r$. The distribution of colors of the two dynamically excited surface types can be modeled using the two-component mixing models from Fraser \& Brown (2012). With the combination of $g-r$ and $r-z$, the dynamically excited classes can be separated cleanly into red and neutral surface classes. In $g - r$ and $r - z$, the two dynamically excited surface groups are also clearly distinct from the cold classical TNO surfaces, which are red, with $g-r\gtrsim$0.85 and $r-z\lesssim$0.6, while all dynamically excited objects with similar $g-r$ colors exhibit redder $r-z$ colors. The $z$ band photometry makes it possible for the first time to differentiate the red excited TNO surfaces from the red cold classical TNO surfaces. The discovery of different $r-z$ colors for these cold classical TNOs makes it possible to search for cold classical surfaces in other regions of the Kuiper belt and to completely separate cold classical TNOs from the dynamically excited population, which overlaps in orbital parameter space.

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