2009A&A...506..425A


Query : 2009A&A...506..425A

2009A&A...506..425A - Astronomy and Astrophysics, volume 506, 425-429 (2009/10-4)

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

AIGRAIN S., PONT F., FRESSIN F., ALAPINI A., ALONSO R., AUVERGNE M., BARBIERI M., BARGE P., BORD E 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., LEGER A., LLEBARIA A., MAGAIN P., MAZEH T., MOUTOU C., OLLIVIER M., PAETZOLD M., QUELOZ D., RAUER H., ROUAN D., SCHNEIDER J., WUCHTER G. and ZUCKER S.

Abstract (from CDS):

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 2h time scales is described well by a power-law with index 0.25 in R-magnitude, ranging from 0.1mmag at R=11.5 to 1mmag 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 0.5mmag) 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 2h for dwarf stars are extremely low, reaching 0.05mmag at the bright end.

Abstract Copyright:

Journal keyword(s): methods: data analysis - techniques: photometric - stars: planetary systems

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13433 0
2 NAME Aql Region reg ~ ~           ~ 367 0

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2023.01.31-07:14:41

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