arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2112.06754astro-ph.EP
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Col-OSSOS:探测柯伊伯带祖先种群内的冰线/颜色转变

Col-OSSOS: Probing Ice Line/Color Transitions within the Kuiper Belt's Progenitor Populations

Laura E. Buchanan, Megan E. Schwamb, Wesley C. Fraser, Michele T. Bannister, Michaël Marsset, Rosemary E. Pike, David Nesvorný, J. J. Kavelaars, Susan D. Benecc… 展开作者

Laura E. Buchanan, Megan E. Schwamb, Wesley C. Fraser, Michele T. Bannister, Michaël Marsset, Rosemary E. Pike, David Nesvorný, J. J. Kavelaars, Susan D. Benecchi, Matthew J. Lehner, Shiang-Yu Wang, Nuno Peixinho, Kathryn Volk, Mike Alexandersen, Ying-Tung Chen, Brett Gladman, Stephen Gwyn, Jean-Marc Petit

摘要:

柯伊伯带内受动力激发的天体表面颜色呈双峰分布,这些不同的表面颜色可能是这些天体形成的示踪物。在这项工作中,我们探索径向颜色分布在原始的星子盘和影响的位置内的柯伊伯带的祖先人口的冰线/颜色转换。我们结合一个完整的动力学模型的柯伊伯带的演化,由于海王星的迁移与精确的表面颜色测量的颜色外太阳系起源调查,以检查真正的颜色比率内的柯伊伯带和冰线内的原始磁盘。我们调查了一个占主导地位的,表面颜色变化的冰线的位置,在初始磁盘内有两种可能的表面颜色布局;(1)内部中性表面和外部红色,(2)内部红色表面和外部中性。我们进行了模拟与一个原始的磁盘,在30天文单位截断。通过径向步进的颜色过渡出通过0.5 AU的间隔,我们表明,这两个磁盘配置与所观察到的颜色分数是一致的。对于内部中性,外部红色原始磁盘,我们发现,颜色过渡可以在$28^{+2}_{-3}$ au在95%的置信水平。对于内部红色、外部中性原始盘,颜色过渡可以在95%置信水平下在$27^{+3}_{-3}$ au处。

英文摘要:

Dynamically excited objects within the Kuiper belt show a bimodal distribution in their surface colors, and these differing surface colors may be a tracer of where these objects formed. In this work we explore radial color distributions in the primordial planetesimal disk and implications for the positions of ice line/color transitions within the Kuiper belt's progenitor populations. We combine a full dynamical model of the Kuiper belt's evolution due to Neptune's migration with precise surface colors measured by the Colours of the Outer Solar System Origins Survey in order to examine the true color ratios within the Kuiper belt and the ice lines within the primordial disk. We investigate the position of a dominant, surface color changing ice-line, with two possible surface color layouts within the initial disk; (1) inner neutral surfaces and outer red, and (2) inner red surfaces and outer neutral. We performed simulations with a primordial disk that truncates at 30 au. By radially stepping the color transition out through 0.5 au intervals we show that both disk configurations are consistent with the observed color fraction. For an inner neutral, outer red primordial disk we find that the color transition can be at $28^{+2}_{-3}$ au at a 95% confidence level. For an inner red, outer neutral primordial disk the color transition can be at $27^{+3}_{-3}$ au at a 95% confidence level.

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