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arXiv 1202.0827astro-ph.EP
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外太阳系表面的哈勃宽视场照相机3测试:柯伊伯带的组成类

The Hubble Wide Field Camera 3 Test of Surfaces in the Outer Solar System: The Compositional Classes of the Kuiper Belt

W. C. Fraser, M. E. Brown

摘要:

我们提出的第一个结果的哈勃宽视场相机3测试表面在外太阳系(H/WTSOSS)。这次调查的目的是测量大量柯伊伯带天体的表面性质,并试图推断成分和动力学的相关性。我们发现,半人马座和低近日点散射盘和共振对象表现出几乎相同的分叉光学颜色分布,并组成两个明确定义的对象组。这两组具有高度相关的光学和近红外颜色,这是很好地描述了一对两个组件的混合物模型,具有不同的红色组件,但共享一个共同的中性组件。小的,$H_{606}\gtrsim5.6$高近日点激发的物体是完全一致的,从两个分支的混合模型表明,颜色分叉的半人马座是明显的,在所有小的激发物体。另一方面,大于$H_{606}\sim5.6$的天体与混合模型不一致,这表明较小的天体避免了一些进化过程。所有激发态粒子群之间存在分叉,这表明在激发态柯伊伯带被填充之前,两类独立的物体就存在于原始盘中。冷的经典天体表现出不同类型的表面,其颜色与混合模型的红色分支一致,但具有更高的反射率。

英文摘要:

We present the first results of the Hubble Wide Field Camera 3 Test of Surfaces in the Outer Solar System (H/WTSOSS). The purpose of this survey was to measure the surface properties of a large number of Kuiper belt objects and attempt to infer compositional and dynamical correlations. We find that the Centaurs and the low-perihelion scattered disk and resonant objects exhibit virtually identical bifurcated optical colour distributions and make up two well defined groups of object. Both groups have highly correlated optical and NIR colours which are well described by a pair of two component mixture models that have different red components, but share a common neutral component. The small, $H_{606}\gtrsim5.6$ high-perihelion excited objects are entirely consistent with being drawn from the two branches of the mixing model suggesting that the colour bifurcation of the Centaurs is apparent in all small excited objects. On the other hand, objects larger than $H_{606}\sim5.6$ are not consistent with the mixing model, suggesting some evolutionary process avoided by the smaller objects. The existence of a bifurcation amongst all excited populations argues that the two separate classes of object existed in the primordial disk before the excited Kuiper belt was populated. The cold classical objects exhibit a different type of surface which has colours that are consistent with being drawn from the red branch of the mixing model, but with much higher albedos.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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