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arXiv 1303.0255astro-ph.EP
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测量开普勒管道I中的Transit信号恢复:单个事件

Measuring Transit Signal Recovery in the Kepler Pipeline I: Individual Events

Jessie L. Christiansen, Bruce D. Clarke, Christopher J. Burke, Jon M. Jenkins, Thomas S. Barclay, Eric B. Ford, Michael R. Haas, Shawn Seader, Jeffrey Claiborne… 展开作者

Jessie L. Christiansen, Bruce D. Clarke, Christopher J. Burke, Jon M. Jenkins, Thomas S. Barclay, Eric B. Ford, Michael R. Haas, Shawn Seader, Jeffrey Claiborne Smith, Susan E. Thompson, Joseph D. Twicken

摘要:

开普勒任务的目的是测量类太阳恒星的宜居带中地球大小的行星的频率。从探测到的行星样本中恢复潜在行星人口的一个关键组成部分是了解该样本的完整性-在给定的数据集中可能被发现的行星中有多少被实际探测到。在这里,我们概述了确定样本完整性所需的信息,并描述了一个实验,以解决该问题的一个特定方面,这是过境信号恢复的问题。我们调查在何种程度上开普勒管道保留个别过境信号注入模拟过境到像素级数据,通过管道处理修改后的像素,并比较测得的过境信噪比(SNR)的预期没有扰动的管道。我们注入模拟过境信号在整个焦平面的一组观测长度为89天。平均而言,我们发现注入信号的SNR在MS = 0.9973(+/-0.0012)xBS-0.0151(+/-0.0049)处恢复,其中MS是测量的SNR,BS是基线或预期的SNR。该相关性周围分布的1σ宽度为+/-2.64%。我们讨论的管道过程中,导致测量的SNR显着偏离基线SNR,这些主要是相邻的航天器重新指向和消除谐波的SNR测量之前的数据处理。最后,我们概述了进一步的工作,需要验证开普勒管道的完整性。

英文摘要:

The Kepler Mission was designed to measure the frequency of Earth-size planets in the habitable zone of Sun-like stars. A crucial component for recovering the underlying planet population from a sample of detected planets is understanding the completeness of that sample - what fraction of the planets that could have been discovered in a given data set were actually detected. Here we outline the information required to determine the sample completeness, and describe an experiment to address a specific aspect of that question, which is the issue of transit signal recovery. We investigate the extent to which the Kepler pipeline preserves individual transit signals by injecting simulated transits into the pixel-level data, processing the modified pixels through the pipeline, and comparing the measured transit signal-to-noise ratio (SNR) to that expected without perturbation by the pipeline. We inject simulated transit signals across the full focal plane for a set of observations of length 89 days. On average, we find that the SNR of the injected signal is recovered at MS = 0.9973(+/-0.0012)xBS-0.0151(+/-0.0049), where MS is the measured SNR and BS is the baseline, or expected, SNR. The 1σ width of the distribution around this correlation is +/-2.64%. We discuss the pipeline processes that cause the measured SNR to deviate significantly from the baseline SNR; these are primarily the handling of data adjacent to spacecraft re-pointings and the removal of harmonics prior to the measurement of the SNR. Finally we outline the further work required to characterise the completeness of the Kepler pipeline.

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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