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arXiv 2206.04068astro-ph.EP
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Col-OSSOS:两种柯伊伯带表面

Col-OSSOS: The Two Types of Kuiper Belt Surfaces

Wesley C. Fraser, Rosemary E. Pike Michael Marsset, Megan E. Schwamb, Michele T. Bannister, Laura Buchanan, JJ Kavelaars, Susan D. Benecchi, Nicole J. Tan, Nuno… 展开作者

Wesley C. Fraser, Rosemary E. Pike Michael Marsset, Megan E. Schwamb, Michele T. Bannister, Laura Buchanan, JJ Kavelaars, Susan D. Benecchi, Nicole J. Tan, Nuno Peixinho, Stephen D. J. Gwyn, Ying-Tung Chen, Brett Gladman, Kathryn Volk

摘要:

外太阳系起源巡天的颜色(Col-OSSOS)收集了92个柯伊伯带天体(KBO)的高质量、近同时的(g-r)和(r-J)颜色,其中一些收集了(u-g)和(r-z)。我们介绍了调查和数据分析的现状。认识到大多数冰体的光学颜色大致遵循变红曲线,我们提出了一个新的投影的光学近红外颜色,纠正主要的非线性特征的光学近红外沿纵坐标。我们发现证据的分歧,在投影的颜色,呈现自己作为一个对角线空区域的光学近红外。重新分析过去的颜色调查也揭示了同样的分歧。我们将其解释为两个独立的表面类别的证据:红外类跨越了整个光学颜色范围,并广泛遵循变红曲线,而弱红外对象在光学颜色方面受到限制,并且在近红外中不如红外对象明亮。我们提出了一个两类模型。每个类别中的对象由单独的蓝色和红色材料组成,并且颜色范围很广。光谱被建模为具有不同斜率的线性光学和NIR光谱,其在一些过渡波长处相交。这两个类别的基本光谱特性完全再现了在UV-光学-NIR颜色空间($0.4\lesssimλ\lesssim1.4 \mbox{ $ μ $m}$)中观察到的结构,包括在Col-OSSOS和H/WTSOSS数据集中观察到的分叉,冷经典KBO具有比激发物体更低的(r-z)颜色的趋势,以及众所周知的双峰光学颜色分布。

英文摘要:

The Colours of the Outer Solar System Origins Survey (Col-OSSOS) has gathered high quality, near-simultaneous (g-r) and (r-J) colours of 92 Kuiper Belt Objects (KBOs) with (u-g) and (r-z) gathered for some. We present the current state of the survey and data analysis. Recognizing that the optical colours of most icy bodies broadly follow the reddening curve, we present a new projection of the optical-NIR colours, which rectifies the main non-linear features in the optical-NIR along the ordinates. We find evidence for a bifurcation in the projected colours which presents itself as a diagonal empty region in the optical-NIR. A reanalysis of past colour surveys reveals the same bifurcation. We interpret this as evidence for two separate surface classes: the BrightIR class spans the full range of optical colours and broadly follows the reddening curve, while the FaintIR objects are limited in optical colour, and are less bright in the NIR than the BrightIR objects. We present a two class model. Objects in each class consist of a mix of separate blue and red materials, and span a broad range in colour. Spectra are modelled as linear optical and NIR spectra with different slopes, that intersect at some transition wavelength. The underlying spectral properties of the two classes fully reproduce the observed structures in the UV-optical-NIR colour space ($0.4\lesssimλ\lesssim1.4 \mbox{ $μ$m}$), including the bifurcation observed in the Col-OSSOS and H/WTSOSS datasets, the tendency for cold classical KBOs to have lower (r-z) colours than excited objects, and the well known bimodal optical colour distribution.

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