Bibcode
Aigrain, S.; Pont, F.; Fressin, F.; Alapini, A.; Alonso, R.; Auvergne, M.; Barbieri, M.; Barge, P.; Bordé, P.; Bouchy, F.; Deeg, H.; de La Reza, R.; Deleuil, M.; Dvorak, R.; Erikson, A.; Fridlund, M.; Gondoin, P.; Guterman, P.; Jorda, L.; Lammer, H.; Léger, A.; Llebaria, A.; Magain, P.; Mazeh, T.; Moutou, C.; Ollivier, M.; Pätzold, M.; Queloz, D.; Rauer, H.; Rouan, D.; Schneider, J.; Wuchter, G.; Zucker, S.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 506, Issue 1, 2009, pp.425-429
Advertised on:
10
2009
Revista
Número de citas
51
Número de citas referidas
44
Descripción
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/.
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