1. Validation of N1 Light Curves
of the Initial Run
(AN1_STAR product, IRa01)
F. Baudin, E. Michel

2. Specifications
(COR-SP-0-83-PROJ )
Duty cycle: 90% during 5 days, 80% on a run
Noise level: 0.6 ppm between 0.1 and 10 mHz in 5 days for a (mV=5.7) star and photon-noise limited up to mV=9.
Polluted frequency range (orbital perturbations): <10% between 0.1 and 1 mHz

3. IRa01 duration: ≈60 days, from end of January to Beginning of April
10 stars observed

4. Some examples

5. Some examples

6. Some examples

7. Some examples

8. Some examples

9. Duty cycle (whole run) 20 89.7% 83 89.1% 116 89.9% 123 89.6% 156 89.4%
COROT ID
D. C. 20
89.7% 83
89.1%
116
89.9%
123
89.6%
156
89.4%
187
214
89.5%
223
263
400
89.8%

10. Duty cycle
Gaps (sec)
Without recovering SAA events (fine filtering, imagette photometry)

11. Noise level Noise level / photon noise level Measured at:
0.1mHz (over 20 mHz)
6 mHz (over 1mHz)

12. Noise level COROT ID Mv Noise level/phot @ 0.1 – 6 mHz 20 5.77
25 – 1.06 83
9.36
13.5 – 1.15
116
5.45
260 – 0.95
123
9.1
– 1.70
156
8.2
1104 – 1.56
187
9.32
1450 – 1.22
214
7.36
36 – 1.27
223
6.82
2.0 – 0.94
263
9.48
8.0 –1.26
400
6.04
25 – 0.97

13. Orbital peaks Method: if P(forbit) > 2P(local background)
then 5 bins x 3 declared polluted.

14. Orbital peaks
Mv = 9.5 !!!

15. Orbital peaks COROT ID Mv Polluted range (µHz) until 1mHz - 10 mHz 20
5.77
3.3 – 58.7 83
9.36
13.0 – 143.5
116
5.45
3.3 – 169.7
123
9.1
3.3 – 81.6
156
8.2
0.0 – 9.9
187
9.32
13.0 – 189.2
214
7.36
3.3 – 176.2
223
6.82
6.5 – 45.7
263
9.48
9.8 – 186.0
400
6.04
6.5 – 137.0

16. Orbital peaks

17. N1 data / Specifications
Conclusions (1)
Duty cycle: 90% during 5 days, 80% on a run
OK DC≈89.5% (but SAA gaps dominant problem, improvement at N2?)
Noise level
- photon-noise limited between 0.1 and 10mHz up to mV=9:
OK at high freq (6mHz): <N>/<Nphot> ≈1.5 up to mV=9
at 100mHz: dominated by stellar signal in most cases, down to <N>/<Nphot> ~ 2-10 several times
- N = 0.6 ppm in 5 days for a (mV=5.7) star:
OK N = on mV=5.7 (ID20), according to measurement at 6mHz

18. N1 data / Specifications
Conclusions (2)
Polluted frequency range(orbital perturbations):
<10% between 0.1 and 1 mHz:
OK < 1% on [0.1, 1mHz]
OK %on [0.1,10mHz]
Remark: sometimes, observed harmonics of the orbital until 10 mHz (n=60!!!)