凯克，双子座，和帕洛玛200英寸可见photometry的红色和非常红色的海王星特洛伊木马
Keck, Gemini, and Palomar 200-inch visible photometry of red and very-red Neptunian Trojans
摘要：
海王星特洛伊（Neptunian Trojans，NT）是与海王星1：1平均运动共振的海王星外天体，通常被认为是在冰巨星向外迁移的过程中，从原来的海王星外原行星盘被捕获到与冰巨星共轨共振的位置。因此，NT的颜色分布可能是对可能存在于盘中的任何颜色过渡区的位置的约束。为了支持这一可能的测试，我们获得了18个NT的$g$、$r$和$i$波段观测结果，将具有已知可见颜色的NT样本增加了一倍多，达到31个对象。在合并样本中，我们发现$\approx$ 4个对象的$g$ - $i$颜色为$>$ 1.2 mags，将其置于通常定义的非常红（VR）类别中。我们发现，在不考虑观测选择效应的情况下，NT $g$ - $i$的颜色分布在统计上与其他海王星外动力学类不同。Jovian Trojans和NT的光学颜色显示出与先前声称的额外VR NT相比不太相似。NT中VR天体的存在可能表明，在原行星盘中红色到VR颜色过渡区的位置在30-35 au的内部。
英文摘要：
Neptunian Trojans (NTs), trans-Neptunian objects in 1:1 mean-motion resonance with Neptune, are generally thought to have been captured from the original trans-Neptunian protoplanetary disk into co-orbital resonance with the ice giant during its outward migration. It is possible, therefore, that the colour distribution of NTs is a constraint on the location of any colour transition zones that may have been present in the disk. In support of this possible test, we obtained $g$, $r$, and $i$-band observations of 18 NTs, more than doubling the sample of NTs with known visible colours to 31 objects. Out of the combined sample, we found $\approx$4 objects with $g$-$i$ colours of $>$1.2 mags placing them in the very red (VR) category as typically defined. We find, without taking observational selection effects into account, that the NT $g$-$i$ colour distribution is statistically distinct from other trans-Neptunian dynamical classes. The optical colours of Jovian Trojans and NTs are shown to be less similar than previously claimed with additional VR NTs. The presence of VR objects among the NTs may suggest that the location of the red to VR colour transition zone in the protoplanetary disk was interior to 30-35 au.
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