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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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