Noise properties of the CoRoT data. A planet-finding perspective

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Noise properties of the CoRoT data. A planet-finding perspective

Show simple item record Aigrain, Suzanne en_GB Pont, F. en_GB Fressin, F. en_GB Alapini, Aude en_GB Alonso, R. en_GB Auvergne, M. en_GB Barbieri, M. en_GB Barge, P. en_GB Bordé, P. en_GB Bouchy, F. en_GB Deeg, H. J. en_GB De la Reza, R. en_GB Deleuil, M. en_GB Dvorak, R. en_GB Erikson, A. en_GB Fridlund, M. en_GB Gondoin, P. en_GB Guterman, P. en_GB Jorda, L. en_GB Lammer, H. en_GB Léger, A. en_GB Llebaria, A. en_GB Magain, P. en_GB Mazeh, T. en_GB Moutou, C. en_GB Ollivier, M. en_GB Pätzold, M. en_GB Queloz, D. en_GB Rauer, H. en_GB Rouan, D. en_GB Schneider, J. en_GB Wuchterl, G. en_GB Zucker, S. en_GB 2009-11-27T12:26:37Z en_GB 2011-01-25T11:53:59Z en_US 2013-03-20T13:02:01Z 2009 en_GB
dc.description.abstract 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. en_GB
dc.identifier.citation 506 (1), pp. 425-429 en_GB
dc.identifier.doi 10.1051/0004-6361/200911885 en_GB
dc.identifier.uri en_GB
dc.language.iso en en_GB
dc.publisher EDP Sciences en_GB
dc.relation.url en_GB
dc.subject data analysis methods en_GB
dc.subject photometric techniques en_GB
dc.subject planetary systems en_GB
dc.title Noise properties of the CoRoT data. A planet-finding perspective en_GB
dc.type Article en_GB 2009-11-27T12:26:37Z en_GB 2011-01-25T11:53:59Z en_US 2013-03-20T13:02:01Z
dc.identifier.issn 0004-6361 en_GB
dc.identifier.issn 1432-0746 en_GB
dc.description Copyright © The European Southern Observatory (ESO) en_GB
dc.identifier.journal Astronomy and Astrophysics en_GB

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