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Evaluation of exo N1 data

Evaluation of exo N1 data. M.Ollivier - L Jorda. Goal of the evaluation. Check if N1 data are compliant with N1 specifications Global noise not larger than 1.5 times the photon noise for a K0 star of mag 14 (photon noise = 700 ppm over 512 seconds, 250 ppm over 1hour).

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Evaluation of exo N1 data

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  1. Evaluation of exo N1 data M.Ollivier - L Jorda 25th CoRoT Scientific Council : 24-25 sept 2007 - M.O. - L.J.

  2. Goal of the evaluation • Check if N1 data are compliant with N1 specifications • Global noise not larger than 1.5 times the photon noise for a K0 star of mag 14 (photon noise = 700 ppm over 512 seconds, 250 ppm over 1hour) 25th CoRoT Scientific Council : 24-25 sept 2007 - M.O. - L.J.

  3. Conclusion of first evaluation (june 2007) • White photometry • Pb with outliers (SAA) • Pb with hot pixels, particularly when present in a background window • When outliers are flagged and kept away, specification is reached whatever the magnitude is • Colored photometry • Drift (red : positive slope, green and blue : negative slope) • As a consequence, specification in term of stability is not reached (even if OK fter slope correction). Conclusion : not far from N1 requirements 25th CoRoT Scientific Council : 24-25 sept 2007 - M.O. - L.J.

  4. What has changed in the pipeline ? • Optimisation of parameters for cosmics detection • Flag of the SAA input / output (not implemented in tested data) • How to correct hot pixels (cf. VL and MA presentations) 25th CoRoT Scientific Council : 24-25 sept 2007 - M.O. - L.J.

  5. Method • Starting from N1 data (LRc01 in this case, IR01 in previous evaluation) • Use of unflagged data only • 512 second sampling • Removal of low frequencies (substraction of a fit over 16 samples) • Removal of outliers (only unflagged points) • Evaluation of mean and variance of residuals 25th CoRoT Scientific Council : 24-25 sept 2007 - M.O. - L.J.

  6. White photometry 25th CoRoT Scientific Council : 24-25 sept 2007 - M.O. - L.J.

  7. White photometry (2) • Very few outliers that have not been detected and flagged • The hot pixels are very present and really need to be treated. 25th CoRoT Scientific Council : 24-25 sept 2007 - M.O. - L.J.

  8. Colored photometry • Real pb of color correction in quite all LRc01 LCs. 25th CoRoT Scientific Council : 24-25 sept 2007 - M.O. - L.J.

  9. Colored photometry (2) 25th CoRoT Scientific Council : 24-25 sept 2007 - M.O. - L.J.

  10. Colored photometry (3) • Intra color correction not optimized • Pb of drift not corrected • S/N requirement not compliant with the specification Colored photometry processing must be improved (by the project or by users ?) 25th CoRoT Scientific Council : 24-25 sept 2007 - M.O. - L.J.

  11. Conclusions • White photometry is OK (from S/N requirement point of view) • A processing for of hot pixels should be implemented • Colored photometry is still not at the required level. 25th CoRoT Scientific Council : 24-25 sept 2007 - M.O. - L.J.

  12. “nice” LCs 25th CoRoT Scientific Council : 24-25 sept 2007 - M.O. - L.J.

  13. “nice” LCs 25th CoRoT Scientific Council : 24-25 sept 2007 - M.O. - L.J.

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