Principal Component Analysis to correct data systematics. Case study: K2 light curves
arXiv:2003.04123 · doi:10.1007/s10686-020-09656-x
Abstract
Instrumental data are affected by systematic effects that dominate the errors and can be relevant when searching for small signals. This is the case of the K2 mission, a follow up of the Kepler mission, that, after a failure on two reaction wheels, has lost its stability properties rising strongly the systematics in the light curves and reducing its photometric precision. In this work, we have developed a general method to remove time related systematics from a set of light curves, that has been applied to K2 data. The method uses the Principal Component Analysis to retrieve the correlation between the light curves due to the systematics and to remove its effect without knowing any information other than the data itself. We have applied the method to all the K2 campaigns available at the Mikulski Archive for Space Telescopes, and we have tested the effectiveness of the procedure and its capability in preserving the astrophysical signal on a few transits and on eclipsing binaries. One product of this work is the identification of stable sources along the ecliptic plane that can be used as photometric calibrators for the upcoming Atmospheric Remote-sensing Exoplanet Large-survey mission.
arXiv comment20 pages, 7 figures. Accepted for publication
References in corpus (20)
- The K2 Mission: Characterization and Early results
- Kepler Presearch Data Conditioning II - A Bayesian Approach to Systematic Error Correction
- A Technique for Extracting Highly Precise Photometry for the Two-Wheeled Kepler Mission
- Homogeneous Photometry for Star Clusters and Resolved Galaxies. II. Photometric Standard Stars
- UBVRI Photometric Standard Stars Around the Celestial Equator: Updates and Additions
- Spitzer Secondary Eclipses of the Dense, Modestly-irradiated, Giant Exoplanet HAT-P-20b Using Pixel-Level Decorrelation
- EVEREST: Pixel Level Decorrelation of K2 Light curves
- K2SC: Flexible systematics correction and detrending of K2 light curves using Gaussian Process regression
- A nearby M star with three transiting super-Earths discovered by K2
- UBVRI Photometric Standard Stars Around the Sky at -50 Degrees Declination
- Precise time-series photometry for the Kepler-2.0 mission
- K2P A photometry pipeline for the K2 mission
- Optical Multicolor Photometry of Spectrophotometric Standard Stars
- Three's Company: An additional non-transiting super-Earth in the bright HD 3167 system, and masses for all three planets
- K2 Variable Catalogue: Variable Stars and Eclipsing Binaries in K2 Campaigns 1 and 0
- Two Small Planets Transiting HD 3167
- High Precision Photometry for K2 Campaign 1
- The ground-based H, K, and L-band absolute emission spectra of HD 209458b
- The CALSPEC Stars P177D and P330E
- Selective Principal Component Extraction and Reconstruction: A Novel Method for Ground Based Exoplanet Spectroscopy