It has been recently claimed that KOIs-268.01, 303.01, 1888.01, 1925.01, 2728.01, and 3320.01 are exomoon candidates, based on an analysis of their transit timing. Here, we perform an independent investigation, which is framed in terms of three questions: (1) Are there significant transit timing variations (TTVs)? (2) Is there a significant periodic TTV? (3) Is there evidence for a nonzero moon mass? We applied rigorous statistical methods to these questions alongside a reanalysis of the Kepler photometry and find that none of the Kepler objects of interest (KOIs) satisfy our three tests. Specifically, KOIs-268.01 and 3220.01 pass none of the tests and KOIs-303.01, 1888.01, and 1925.01 pass a single test each. Only KOI-2728.01 satisfies two, but fails the cross-validation test for predictions. Further, detailed photodynamical modeling reveals that KOI-2728.01 favors a negative-radius moon (as does KOI-268.01). We also note that we find a significant photoeccentric effect for KOI...

中文翻译：

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对六个最近要求保护的Exomoon候选人的独立分析

最近，根据对运输时间的分析，KOIs-268.01、303.01、1888.01、1925.01、2728.01和3320.01是外显子候选物。在这里，我们将进行三个方面的独立调查：（1）是否存在重大的运输时间变化（TTV）？（2）是否有重要的定期电视节目？（3）是否有证据表明月球质量非零？我们对这些问题采用了严格的统计方法，同时对开普勒光度法进行了重新分析，发现没有一个开普勒感兴趣的对象（KOI）满足我们的三个测试。具体而言，KOIs-268.01和3220.01未通过任何测试，而KOIs-303.01、1888.01和1925.01均仅通过了一次测试。只有KOI-2728.01满足两个条件，但未通过交叉验证测试进行预测。进一步，详细的光动力学建模表明，KOI-2728.01支持负半径的月亮（KOI-268.01也是如此）。我们还注意到，我们发现KOI具有明显的光偏心效应。