The Trojan-like Colors of Low-perihelion Kuiper Belt Objects

IF 3.8 Q2 ASTRONOMY & ASTROPHYSICS The Planetary Science Journal Pub Date : 2024-09-03 DOI:10.3847/psj/ad698a
Matthew Belyakov, Michael E. Brown, Alya Al-Kibbi
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Abstract

An important testable prediction of dynamical instability models for the early evolution of the solar system is that Jupiter Trojans share a source population with the Kuiper Belt. Concrete evidence of this prediction remains elusive, as Kuiper Belt objects (KBOs) and Jupiter Trojans appear to have different surface compositions. We address the long-standing question of Trojan origin by finding a dynamical subpopulation in the Kuiper Belt with Trojan-like colors. Combining existing photometric data with our own surveys on Keck I and Palomar P200, we find that the low-perihelion (q < 30 au, a > 30 au) component of the Kuiper Belt has colors that bifurcate similarly to the Jupiter Trojans, unlike Centaurs (a < 30 au), which have redder, Kuiper Belt-like colors. To connect the Jupiter Trojans to the Kuiper Belt, we test whether the distinct Trojan-like colors of low-perihelion KBOs result from surface processing or are sourced from a specific population in the Kuiper Belt. By simulating the evolution of the Canada–France Ecliptic Plane Survey synthetic population of KBOs for four billion years, we find that differences in heating timescales cannot result in a significant depletion of very red low-perihelion KBOs as compared to the Centaurs. We find that the neutrally colored scattered disk objects (e > 0.6 KBOs) contribute more to the low-perihelion KBO population than to Centaurs, resulting in their different colors.
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低近日点柯伊伯带天体的特洛伊木马般的颜色
太阳系早期演化的动力学不稳定性模型的一个重要的可检验预测是木星三剑星与柯伊伯带共享一个源群。由于柯伊伯带天体(KBOs)和木星特洛伊木星的表面成分似乎不同,这一预测的具体证据仍然难以捉摸。我们在柯伊伯带发现了一个具有类似特洛伊木马颜色的动态亚群,从而解决了特洛伊木马起源这一长期存在的问题。通过将现有的测光数据与我们自己在凯克 I 和帕洛玛 P200 上进行的巡天相结合,我们发现柯伊伯带的低近日点(q < 30 au, a > 30 au)部分具有与木星特洛伊木马类似的颜色分叉,而半人马(a < 30 au)则不同,它具有更红的类似柯伊伯带的颜色。为了将木星特洛伊木马与柯伊伯带联系起来,我们测试了低近日点KBOs独特的特洛伊木马般的颜色是表面加工的结果,还是来自柯伊伯带的一个特定种群。通过模拟加拿大-法国黄道平面巡天卫星合成KBOs群40亿年的演变过程,我们发现加热时间尺度的差异不会导致极红色低近日点KBOs比半人马显著减少。我们发现,中性色散射盘天体(e > 0.6 KBOs)对低近日点 KBO 群的贡献大于半人马天体,从而导致它们的颜色不同。
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来源期刊
The Planetary Science Journal
The Planetary Science Journal Earth and Planetary Sciences-Geophysics
CiteScore
5.20
自引率
0.00%
发文量
249
审稿时长
15 weeks
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