1. Fabio de Oliveira Fialho Michel Auvergne
Definition and implementation of instrumental corrections in the spatial mission
Fabio de Oliveira Fialho
Michel Auvergne
CoRoT-Brazil Workshop

2. Where am I? Ground Segment - CMC
11/22/2018
CoRoT-Brazil Workshop

3. Overview Illustration
CCD
Mask
Ecartometry
Photometry
11/22/2018
CoRoT-Brazil Workshop

4. Thesis SISMO EXO x,y x,y 11/22/2018 CoRoT-Brazil Workshop
Optimal Photometric Aperture Definition
Optimal Photometric Aperture Definition
Photometry, Background, Offset, Gain
Photometry
x,y
Ecartometry
Photometric Correction (Jitter)
x,y
Photometric Correction (Jitter)
11/22/2018
CoRoT-Brazil Workshop

5. Photometric Aperture (Mask) Process Illustration
CCD
Mask
Constraints
Unchangeable Mask (On-board Photometric Calculations)
Jitter must be considered
Parasite Stars
11/22/2018
CoRoT-Brazil Workshop

6. Mask Optimal Photometric Aperture Definition
Based on Signal To Noise (SNR) Optimization
Classic Formula:
Including Jitter:
Hypothesis
Independence between Jitter and other noises (Photon Noise and Readout Noise)
11/22/2018
CoRoT-Brazil Workshop

7. CoRoT-Brazil Workshop
Mask Some Results
MV = 6
MV = 9
No Jitter
425 pixels
208 pixels
Jitter
428 pixels
213 pixels
11/22/2018
CoRoT-Brazil Workshop

8. Photometric Correction Process Illustration
CCD
Mask
Photometry
Affected by jitter
Constraints
On-board Photometric Calculations
11/22/2018
CoRoT-Brazil Workshop

9. Photometric Correction Remarkable Points
No images on ground
Instantaneous Flux must be conserved
Performance in time and frequency domain
Absolute fluxes are unknowns “a priori”
Correction must be of the type: So
But where
We are looking for
11/22/2018
CoRoT-Brazil Workshop

10. Photometric Correction – M1 Stochastic Method
To build we have
Hypothesis
Enough points to build the surface
M1 Limitations
Only periodic signals are well corrected
11/22/2018
CoRoT-Brazil Workshop

11. Photometric Correction – M2 Non-stochastic Method
To build we have
Normalized PSF model, mask,
Hypothesis
Precise PSF model
M2 Limitations
The quality of this correction is limited by the errors on the PSF model
11/22/2018
CoRoT-Brazil Workshop

12. Photometric Correction Examples
SEISMO – M1
EXO – M2
11/22/2018
CoRoT-Brazil Workshop

13. Photometric Correction Some Results of Simulations
For a star SEISMO of MV = 6 and Teff = 6250
11/22/2018
CoRoT-Brazil Workshop

14. Photometric Correction First Test Bench Result
11/22/2018
CoRoT-Brazil Workshop

15. Ecartometric Accuracy Process Illustration – SEISMO
CCD
Ecartometry
11/22/2018
CoRoT-Brazil Workshop

16. Ecartometric Accuracy Process Illustration - EXO
CCD
Ecartometry
11/22/2018
CoRoT-Brazil Workshop

17. Ecartometric Accuracy Some ResultsMV 6 9
(px)
(0.0013,0.0015)
(0.0076,0.0089)
11/22/2018
CoRoT-Brazil Workshop

18. CoRoT-Brazil Workshop
Upcoming Steps
Implementation of another method for the chromatic correction proposed by Marc Ollivier
Ecartometry EXO
11/22/2018
CoRoT-Brazil Workshop

19. CoRoT-Brazil Workshop
Questions?
11/22/2018
CoRoT-Brazil Workshop