Volume 506, Number 1, October IV 2009
The CoRoT space mission: early results
|Page(s)||431 - 434|
|Published online||15 June 2009|
Removing systematics from the CoRoT light curves*
I. Magnitude-dependent zero point
Radcliffe Institute for Advanced Studies at Harvard, 8 Garden St., Cambridge, MA 02138, USA e-mail: firstname.lastname@example.org
2 On Sabbatical leave from School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
3 Le Laboratoire d'Astrophysique de Marseille, UMR 6110 CNRS, Technopôle de Marseille-Étoile, 13388 Marseille Cedex 13, France
4 School of Physics, University of Exeter, Physics Building, Stocker Road, Exeter, Ex4 4QL, UK
5 Geophysics and Planetary Sciences, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
6 School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
7 LESIA, Observatoire de Paris, 92195 Meudon, France
8 IAS, Université Paris XI, 91405 Orsay, France
9 Observatoire de Haute-Provence, 04870 St Michel l'Observatoire, France
10 IAC, 38205 La Laguna, Spain
11 ON/MCT, 20921-030, Rio de Janeiro, Brazil
12 IfA, University of Vienna, 1180 Vienna, Austria
13 Institute of Planetary Research, DLR, 12489 Berlin, Germany
14 RSSD, ESA/ESTEC, 2200 Noordwijk, The Netherlands
15 IWF, Austrian Academy of Sciences, 8042 Graz, Austria
16 IAG, Université de Liège, Liège 1, Belgium
17 RIU, Universität zu Köln, 50931 Köln, Germany
18 Observatoire de Genève, 1290 Sauverny, Switzerland
19 LUTH, Observatoire de Paris, 92195 Meudon, France
20 ZAA, TU Berlin, 10623 Berlin, Germany
Accepted: 28 May 2009
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.
Key words: methods: data analysis / techniques: photometric / planetary systems
The CoRoT space mission, launched on December 27th 2006, has been developed and is operated by CNES, with the contribution of Austria, Belgium, Brazil, ESA, Germany, and Spain. CoRoT data become publicly available one year after release to the Co-Is of the mission from the CoRoT archive: http://idoc-corot.ias.u-psud.fr/.
© ESO, 2009
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