First CoRoT International Symposium – Paris – France
February 4th 2009 EXO PSFs - First CoRoT International Symposium - Paris - Fabio Fialho2 Correction Surface Jitter Jitter Photometric Corrections Jitter Photometric Corrections are implemented using the following equationMotivation PSF-based method We need a super-resolved PSF!!!!
February 4th 2009 EXO PSFs - First CoRoT International Symposium - Paris - Fabio Fialho3 How a blurred image is built
February 4th 2009 EXO PSFs - First CoRoT International Symposium - Paris - Fabio Fialho4 PSF Algorithm We write the: probability density functionp probability density function p jitter-dependent kernelM jitter-dependent kernel M noise-dependent covariance matrixQ noise-dependent covariance matrix - Q We state and solve the optimization problem (recursive gradient method)
February 4th 2009 EXO PSFs - First CoRoT International Symposium - Paris - Fabio Fialho5 Validation – Finding CoRoT-Exo-2b White flux before correction Blue flux before correction White flux after correction Blue flux after correction Input 1-pixel images Estimate ½ pixel PSF
February 4th 2009 EXO PSFs - First CoRoT International Symposium - Paris - Fabio Fialho6 Conclusions Improved robustness compared to the Asteroseismology channel’s algorithm, allowing its use in the Planet Finder channel. The modeled PSF provides about 8-times gain of SNR for the white photometry (periods of the worst case of jitter noise). Robustness improvement Planets detectability threshold increasement
February 4th 2009 EXO PSFs - First CoRoT International Symposium - Paris - Fabio Fialho7 Acknowledgements Réza Samadi, Nicolas Lautié, Vincent Lapeyrère, Damien Naudet, Emmanuel Grolleau, Sylviane Chaintreuil, Frederick Heuripeau, Renaud Romagnan, Laurent Jorda, etc… The quality of these corrections could not be achieved without the work of many other people like Réza Samadi, Nicolas Lautié, Vincent Lapeyrère, Damien Naudet, Emmanuel Grolleau, Sylviane Chaintreuil, Frederick Heuripeau, Renaud Romagnan, Laurent Jorda, etc… Vanderlei Parro