Reference : Noise properties of the CoRoT data. A planet-finding perspective
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/25509
Noise properties of the CoRoT data. A planet-finding perspective
English
Aigrain, S. [School of Physics, University of Exeter, Exeter, EX4 4QL, UK]
Pont, F. [School of Physics, University of Exeter, Exeter, EX4 4QL, UK]
Fressin, F. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, US]
Alapini, A. [School of Physics, University of Exeter, Exeter, EX4 4QL, UK]
Alonso, R. [LAM, Université de Provence, 13388 Marseille, France]
Auvergne, M. [LESIA, Observatoire de Paris, 92195 Meudon, France]
Barbieri, M. [LAM, Université de Provence, 13388 Marseille, France]
Barge, P. [LAM, Université de Provence, 13388 Marseille, France]
Bordé, P. [ > > ]
Bouchy, F. [Observatoire de Haute-Provence, 04870 St Michel l'Observatoire, France]
Deeg, H. [IAC, 38205 La Laguna, Spain]
de La Reza, R. [ON/MCT, 20921-030, Rio de Janeiro, Brazil]
Deleuil, M. [LAM, Université de Provence, 13388 Marseille, France]
Dvorak, R. [IfA, University of Vienna, 1180 Vienna, Austria]
Erikson, A. [Institute of Planetary Research, DLR, 12489 Berlin, Germany]
Fridlund, M. [RSSD, ESA/ESTEC, 2200 Noordwijk, The Netherlands]
Gondoin, P. [RSSD, ESA/ESTEC, 2200 Noordwijk, The Netherlands]
Guterman, P. [LAM, Université de Provence, 13388 Marseille, France]
Jorda, L. [LAM, Université de Provence, 13388 Marseille, France]
Lammer, H. [IWF, Austrian Academy of Sciences, 8042 Graz, Austria]
Léger, A. [ > > ]
Llebaria, A. [LAM, Université de Provence, 13388 Marseille, France]
Magain, Pierre mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Mazeh, T. [Sch. Physics & Astronomy, Tel Aviv Univ., Tel Aviv 69978, Israel]
Moutou, C. [LAM, Université de Provence, 13388 Marseille, France]
Ollivier, M. [IAS, Université Paris XI, 91405 Orsay, France]
Pätzold, M. [ > > ]
Queloz, D. [Observatoire de Genève, 1290 Sauverny, Switzerland]
Rauer, H. [Institute of Planetary Research, DLR, 12489 Berlin, Germany ; ZAA, TU Berlin, 10623 Berlin, Germany]
Rouan, D. [LESIA, Observatoire de Paris, 92195 Meudon, France]
Schneider, J. [LUTH, Observatoire de Paris, 92195 Meudon, France]
Wuchter, G. [Thüringer Landessternwarte, 07778 Tautenburg, Germany]
Zucker, S. [Dept. Geophysics & Planetary Sciences, Tel Aviv Univ., Tel Aviv 69978, Israel]
1-Oct-2009
Astronomy and Astrophysics
EDP Sciences
506
425-429
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] methods: data analysis ; techniques: photometric ; stars: planetary systems
[en] In this short paper, we study the photometric precision of stellar light curves obtained by the CoRoT satellite in its planet-finding channel, with a particular emphasis on the time scales characteristic of planetary transits. Together with other articles in the same issue of this journal, it forms an attempt to provide the building blocks for a statistical interpretation of the CoRoT planet and eclipsing binary catch to date. After pre-processing the light curves so as to minimise long-term variations and outliers, we measure the scatter of the light curves in the first three CoRoT runs lasting more than 1 month, using an iterative non-linear filter to isolate signal on the time scales of interest. The behaviour of the noise on 2 h time scales is described well by a power-law with index 0.25 in R-magnitude, ranging from 0.1 mmag at R=11.5 to 1 mmag at R=16, which is close to the pre-launch specification, though still a factor 2-3 above the photon noise due to residual jitter noise and hot pixel events. There is evidence of slight degradation in the performance over time. We find clear evidence of enhanced variability on hour time scales (at the level of 0.5 mmag) in stars identified as likely giants from their R magnitude and B-V colour, which represent approximately 60 and 20% of the observed population in the directions of Aquila and Monoceros, respectively. On the other hand, median correlated noise levels over 2 h for dwarf stars are extremely low, reaching 0.05 mmag at the bright end. The CoRoT space mission, launched on December 27, 2006, has been developed and is operated by the 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/.
http://hdl.handle.net/2268/25509
10.1051/0004-6361/200911885
http://adsabs.harvard.edu/abs/2009A%26A...506..425A
The authors thank EDP Sciences for their deposit authorization.
http://de.arxiv.org/abs/0903.1829

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