论文标题
对最近声称的六个候选人的独立分析
An Independent Analysis of the Six Recently Claimed Exomoon Candidates
论文作者
论文摘要
最近据称，基于对其过境时机的分析，KOIS-268.01，303.01，1888.01，1925.01，2728.01＆3320.01是Exomoon候选人。在这里，我们进行了独立的调查，该调查是根据三个问题构建的：1）是否有大量过量的TTV？ 2）是否有明显的周期性TTV？ 3）有证据表明月亮质量吗？我们将严格的统计方法应用于这些问题，以及对开普勒光度法的重新分析，发现KOI都没有满足这三个测试。具体来说，KOIS-268.01＆3220.01通过没有测试和KOIS-303.01，1888.01＆1925.01每个测试。只有KOI-2728.01满足两个，但未能进行预测的交叉验证测试。此外，详细的光动力模型表明，KOI-2728.01有利于月亮的负半径（KOI-268.01也是如此）。我们还注意到，我们发现了KOI-1925.01的显着光中心，表明E>的偏心轨道（0.62 +/- 0.06）。为了进行比较，我们将相同的测试应用于Kepler-1625B，该测试揭示了1）和3），但是2）由于可用的时期数量有限，因此无法使用此处使用的交叉验证方法检查。总之，我们在六个KOI中没有发现令人信服的证据。尽管如此，我们还是能够在与地球蒙蒙的类似的相似的半缩影上得出相对于MS/MP <0.4％[2 Sigma]的koi-3220.01与半肌轴相比，带有koi-3220.01。
It has been recently claimed that KOIs-268.01, 303.01, 1888.01, 1925.01, 2728.01 & 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 excess TTVs? 2) Is there a significant periodic TTV? 3) Is there evidence for a non-zero moon mass? We applied rigorous statistical methods to these questions alongside a re-analysis of the Kepler photometry and find that none of the KOIs satisfy these three tests. Specifically, KOIs-268.01 & 3220.01 pass none of the tests and KOIs-303.01, 1888.01 & 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 favours a negative radius moon (as does KOI-268.01). We also note that we find a significant photoeccentric for KOI-1925.01 indicating an eccentric orbit of e>(0.62+/-0.06). For comparison, we applied the same tests to Kepler-1625b, which reveals that 1) and 3) are passed, but 2) cannot be checked with the cross-validation method used here, due to the limited number of available epochs. In conclusion, we find no compelling evidence for exomoons amongst the six KOIs. Despite this, we're able to derive exomoon mass upper limits versus semi-major axis, with KOI-3220.01 leading to particularly impressive constraints of Ms/Mp < 0.4% [2 sigma] at a similar relative semi-major to that of the Earth-Moon.
