The SARS algorithm: detrending CoRoT light curves with Sysrem using simultaneous external parameters

Abstract

Surveys for exoplanetary transits are usually limited not by photon noise but rather by the amount of red noise in their data. In particular, although the CoRoT spacebased survey data are being carefully scrutinized, significant new sources of systematic noises are still being discovered. Recently, a magnitude-dependant systematic effect was discovered in the CoRoT data by Mazeh & Guterman et al. and a phenomenological correction was proposed. Here we tie the observed effect a particular type of effect, and in the process generalize the popular Sysrem algorithm to include external parameters in a simultaneous solution with the unknown effects. We show that a post-processing scheme based on this algorithm performs well and indeed allows for the detection of new transit-like signals that were not previously detected.

MNRAS accepted. 5 pages, 3 figures

References in corpus (4)

• The effect of red noise on planetary transit detection
• The Transit Light Curve (TLC) Project. I. Four Consecutive Transits of the Exoplanet XO-1b
• Removing systematics from the CoRoT light curves: I. Magnitude-Dependent Zero Point
• Searching For Transiting Circumbinary Planets in CoRoT and Ground-Based Data Using CB-BLS

Cited by in corpus (21)

• Emerging Trends in a Period-Radius Distribution of Close-in Planets
• Transit Detection in the MEarth Survey of Nearby M Dwarfs: Bridging the Clean-First, Search-Later Divide
• High-Resolution Spectroscopic Detection of TiO and Stratosphere in the Day-side of WASP-33b
• The GJ1214 Super-Earth System: Stellar Variability, New Transits, and a Search for Additional Planets
• CoRoT: harvest of the exoplanet program
• An Independent Planet Search In The Kepler Dataset. II. An extremely low-density super-Earth mass planet around Kepler-87
• Optimizing the search for transiting planets in long time series
• Planets, candidates, and binaries from the CoRoT/Exoplanet programme: the CoRoT transit catalogue
• AutoRegressive Planet Search: Methodology
• Detection of Neptune-size planetary candidates with CoRoT data. Comparison with the planet occurrence rate derived from Kepler
• Minute-cadence Observations of the LAMOST Fields with the TMTS: I. Methodology of Detecting Short-period Variables and Results from the first-year Survey
• Periodic transit and variability search with simultaneous systematics filtering: Is it worth it?
• A modified CoRoT detrend algorithm and the discovery of a new planetary companion
• Searching for Variable Stars in the Open Cluster NGC 2355 and Its Surrounding Region
• A study of variable stars in the open cluster NGC 1582 and its surrounding field
• TSARDI: a Machine Learning data rejection algorithm for transiting exoplanet light curves
• Bayesian Methods for Joint Exoplanet Transit Detection and Systematic Noise Characterization
• The DOHA algorithm: a new recipe for cotrending large-scale transiting exoplanet survey light curves
• Investigating Variable Stars in the Open Cluster NGC 1912 and Its Surrounding Field
• Synergies between Exoplanet Surveys and Variable Star Research
• SPHOTOM -- Package for an Automatic Multicolour Photometry