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arXiv 1507.05097astro-ph.EP
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测量开普勒管道II中的Transit信号恢复:用一年数据计算的探测效率

Measuring Transit Signal Recovery in the Kepler Pipeline II: Detection Efficiency as Calculated in One Year of Data

Jessie L. Christiansen, Bruce D. Clarke, Christopher J. Burke, Shawn Seader, Jon M. Jenkins, Joseph D. Twicken, Jeffrey C. Smith, Natalie M. Batalha, Michael R.… 展开作者

Jessie L. Christiansen, Bruce D. Clarke, Christopher J. Burke, Shawn Seader, Jon M. Jenkins, Joseph D. Twicken, Jeffrey C. Smith, Natalie M. Batalha, Michael R. Haas, Susan E. Thompson, Jennifer R. Campbell, Anima Sabale, Akm Kamal Uddin

摘要:

如果开普勒管道的检测效率是已知的,开普勒行星样本只能用于重建潜在的行星发生率,在这里,我们提出了第二个实验的结果,旨在表征这种检测效率。我们将模拟的过境行星信号注入到约10,000个目标的像素数据中,跨越一年的观测,并正常处理像素。我们比较了一组检测的管道从一组模拟的行星的期望,并构建了一个灵敏度曲线的信号恢复作为模拟的过境信号训练的信噪比的函数。灵敏度曲线不满足假设的最大检测效率,但是它并不像一些已发表的检测效率估计那样悲观。对于我们样本中的FGK星,灵敏度曲线很好地拟合了系数a = 4.35和b = 1.05的伽马函数。我们还发现,管道算法恢复的深度和周期注入信号具有非常高的保真度,特别是超过10天的时间。我们使用测量的检测效率与文献中发现的检测效率的先前假设进行简化的发生率计算,以证明引入到所得发生率中的系统误差。计算的发生率的差异可能有助于调和文献中发现的一些不一致之处。

英文摘要:

The Kepler planet sample can only be used to reconstruct the underlying planet occurrence rate if the detection efficiency of the Kepler pipeline is known, here we present the results of a second experiment aimed at characterising this detection efficiency. We inject simulated transiting planet signals into the pixel data of ~10,000 targets, spanning one year of observations, and process the pixels as normal. We compare the set of detections made by the pipeline with the expectation from the set of simulated planets, and construct a sensitivity curve of signal recovery as a function of the signal-to-noise of the simulated transit signal train. The sensitivity curve does not meet the hypothetical maximum detection efficiency, however it is not as pessimistic as some of the published estimates of the detection efficiency. For the FGK stars in our sample, the sensitivity curve is well fit by a gamma function with the coefficients a = 4.35 and b = 1.05. We also find that the pipeline algorithms recover the depths and periods of the injected signals with very high fidelity, especially for periods longer than 10 days. We perform a simplified occurrence rate calculation using the measured detection efficiency compared to previous assumptions of the detection efficiency found in the literature to demonstrate the systematic error introduced into the resulting occurrence rates. The discrepancies in the calculated occurrence rates may go some way towards reconciling some of the inconsistencies found in the literature.

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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