arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1708.08459astro-ph.EP
收藏

近距离超地球和海王星的平均反照率--基于Kepler长频次日食数据的统计分析

Average Albedos of Close-in Super-Earths and Neptunes from Statistical Analysis of Long Cadence Kepler Secondary Eclipse Data

Holly Sheets, Drake Deming

摘要:

我们提出了我们的工作,以确定在{ \it开普勒}候选目录中的小,近距离行星的平均轨道。我们已经调整了我们的方法,平均短节奏的光变曲线的多个开普勒行星候选人的长节奏的数据,以检测一组候选人的平均周期。长节奏数据存在于比短节奏更多的候选者中,因此我们将候选者分成比我们先前的工作更小的半径箱:1-2 Rearth,2-4 Rearth和4-6 Rearth。我们发现,平均而言,所有三个组都比短节奏结果显示的要暗,但不像许多热节奏者那么暗。在行星上热量均匀分布的情况下,这三组行星的平均几何曲率分别为0.11 $\pm$ 0.06、0.05 $\pm$ 0.04和0.11 $\pm$ 0.08。如果热量再分配效率低下,那么太阳辐射率甚至会更低,因为来自行星的总光线中会有更大的热量贡献。我们确认,新发现的假阳性开普勒感兴趣对象(KOI)1662.01确实是一个食双星,其周期是行星候选目录中列出的周期的两倍。我们还新发现了行星候选者KOI 4351.01作为食双星,我们报告了开普勒-4 b(KOI 7.01)的二次食测量值为$\sim$ 7.50 ppm,相位为$\sim$ 0.7,表明该行星处于偏心轨道上。

英文摘要:

We present the results of our work to determine the average albedo for small, close-in planets in the {\it Kepler} candidate catalog. We have adapted our method of averaging short cadence light curves of multiple Kepler planet candidates to long cadence data, in order to detect an average albedo for the group of candidates. Long cadence data exist for many more candidates than the short cadence, and so we separate the candidates into smaller radius bins than in our previous work: 1-2 Rearth, 2-4 Rearth, and 4-6 Rearth. We find that on average, all three groups appear darker than suggested by the short cadence result, but not as dark as many hot Jupiters. The average geometric albedos for the three groups are 0.11 $\pm$ 0.06, 0.05 $\pm$ 0.04, and 0.11 $\pm$ 0.08, respectively, for the case where heat is uniformly distributed about the planet. If heat redistribution is inefficient, the albedos are even lower, since there will be a greater thermal contribution to the total light from the planet. We confirm that newly-identified false positive Kepler Object of Interest (KOI) 1662.01 is indeed an eclipsing binary at twice the period listed in the planet candidate catalog. We also newly identify planet candidate KOI 4351.01 as an eclipsing binary, and we report a secondary eclipse measurement for Kepler-4b (KOI 7.01) of $\sim$ 7.50 ppm at a phase of $\sim$ 0.7, indicating that the planet is on an eccentric orbit.

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。

↑