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arXiv 1301.5791astro-ph.EP
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32个海王星外天体的光变曲线

Lightcurves of 32 Large Transneptunian Objects

Susan D. Benecchi, Scott S. Sheppard

摘要:

我们目前的观测32个主要明亮的,新发现的外海王星天体观测从南半球在39个晚上的观测与2.5米望远镜在拉斯坎帕纳斯天文台。我们的数据集包括所有动态类中的对象,但对离散对象进行了加权。我们找到15个对象,我们可以适合的周期和振幅的数据,并把其他17个对象的光曲线振幅上限。结合我们的样本与较大的样本在文献中,我们发现一个3西格玛之间的光变曲线振幅和绝对星等与较暗的对象具有较大的光变曲线振幅的相关性。我们寻找光变曲线和单个轨道属性之间的相关性,但没有发现任何统计学上显著的结果。然而,如果我们考虑光变曲线的性质与动力学分类,我们发现统计上不同的经典散射和经典共振人口之间的分布,分别与经典对象具有较大的振幅光变曲线。除了潮汐锁定系统的情况下,二元光变曲线的性质在很大程度上与更大的人口相一致。到目前为止,所有测量的妊神星家族天体都有可测量的振幅和旋转周期,这表明它们与较大的TNO种群没有显着不同。我们预计多个因素影响对象旋转:对象大小占主导地位的光变曲线属性,除了在潮汐的情况下,或成比例的大碰撞与其他对象的相互作用,后者的影响是不同的每个子群体。我们还提出了一些对象的相位曲线和颜色,我们的值是没有显着不同的文献中提出的其他样品。

英文摘要:

We present observations of 32 primarily bright, newly discovered Transneptunian objects observable from the Southern Hemisphere during 39 nights of observation with the 2.5-m telescope at Las Campanas Observatory. Our dataset includes objects in all dynamical classes, but is weighted towards Scattered objects. We find 15 objects for which we can fit periods and amplitudes to the data, and place lightcurve amplitude upper limits on the other 17 objects. Combining our sample with the larger sample in the literature, we find a 3-sigma correlation between lightcurve amplitude and absolute magnitude with fainter objects having larger lightcurve amplitudes. We looked for correlations between lightcurve and individual orbital properties, but did not find any statistically significant results. However, if we consider lightcurve properties with respect to dynamical classification, we find statistically different distributions between the Classical-Scattered and Classical-Resonant populations, respectively, with the Classical objects having larger amplitude lightcurves. The properties of binary lightcurves are largely consistent with the greater population except in the case of tidally locked systems. All the Haumea family objects measured so far have measurable amplitudes and rotation periods le 10 hr suggesting that they are not significantly different from the larger TNO population. We expect multiple factors are influencing object rotations: object size dominates lightcurve properties except in the case of tidal, or proportionally large collisional interactions with other objects, the influence of the latter being different for each sub-population. We also present phase curves and colors for some objects; our values are not significantly different from those presented in the literature for other samples.

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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