Removing systematics from the CoRoT light curves: I. Magnitude-dependent zero point

T. Mazeh, P. Guterman, S. Aigrain, S. Zucker, N. Grinberg, A. Alapini, R. Alonso, M. Auvergne, M. Barbieri, P. Barge, P. Bordé, F. Bouchy, H. Deeg, R. De La Reza, M. Deleuil, R. Dvorak, A. Erikson, M. Fridlund, P. Gondoin, L. JordaH. Lammer, A. Léger, A. Llebaria, P. Magain, C. Moutou, M. Ollivier, M. Pätzold, F. Pont, D. Queloz, H. Rauer, D. Rouan, R. Sabo, J. Schneider, G. Wuchterl

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents an analysis that searched for systematic effects within the CoRoT exoplanet field light curves. The analysis identified a systematic effect that modified the zero point of most CoRoT exposures as a function of stellar magnitude. We could find this effect only after preparing a set of learning light curves that were relatively free of stellar and instrumental noise. Correcting for this effect, rejecting outliers that appear in almost every exposure, and applying SysRem, reduced the stellar RMS by about 20%, without attenuating transit signals.

Original languageEnglish
Pages (from-to)431-434
Number of pages4
JournalAstronomy and Astrophysics
Volume506
Issue number1
DOIs
StatePublished - 2009

Keywords

  • Methods: data analysis
  • Planetary systems
  • Techniques: photometric

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