Kepler Presearch Data Conditioning I-Architecture and Algorithms for Error Correction in Kepler Light Curves

被引：694

作者：

Stumpe, Martin C. ^{[1
]}

Smith, Jeffrey C. ^{[1
]}

Van Cleve, Jeffrey E. ^{[1
]}

Twicken, Joseph D. ^{[1
]}

Barclay, Thomas S. ^{[1
]}

Fanelli, Michael N. ^{[1
]}

Girouard, Forrest R. ^{[1
]}

Jenkins, Jon M. ^{[1
]}

Kolodziejczak, Jeffery J. ^{[2
]}

McCauliff, Sean D. ^{[1
]}

Morris, Robert L. ^{[1
]}

机构：

[1] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

[2] Marshall Space Flight Ctr, Huntsville, AL 35812 USA

来源：

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC | 2012年 / 124卷 / 919期

关键词：

SUN-LIKE STAR; NGC; 6811; PLANETS; MISSION; SCIENCE; DETECTABILITY; SYSTEM;

D O I：

10.1086/667698

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Kepler provides light curves of 156,000 stars with unprecedented precision. However, the raw data as they come from the spacecraft contain significant systematic and stochastic errors. These errors, which include discontinuities, systematic trends, and outliers, obscure the astrophysical signals in the light curves. To correct these errors is the task of the Presearch Data Conditioning (PDC) module of the Kepler data analysis pipeline. The original version of PDC in Kepler did not meet the extremely high performance requirements for the detection of miniscule planet transits or highly accurate analysis of stellar activity and rotation. One particular deficiency was that astrophysical features were often removed as a side effect of the removal of errors. In this article we introduce the completely new and significantly improved version of PDC which was implemented in Kepler SOC version 8.0. This new PDC version, which utilizes a Bayesian approach for removal of systematics, reliably corrects errors in the light curves while at the same time preserving planet transits and other astrophysically interesting signals. We describe the architecture and the algorithms of this new PDC module, show typical errors encountered in Kepler data, and illustrate the corrections using real light curve examples.

引用

页码：985 / 999

页数：15

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