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

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Presentation on theme: "25th CoRoT Scientific Council : 24-25 sept 2007 - M.O. - L.J. Evaluation of exo N1 data M.Ollivier - L Jorda."— Presentation transcript:

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

2 25th CoRoT Scientific Council : sept M.O. - L.J. 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)

3 25th CoRoT Scientific Council : sept M.O. - L.J. 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

4 25th CoRoT Scientific Council : sept M.O. - L.J. 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)

5 25th CoRoT Scientific Council : sept M.O. - L.J. 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

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

7 25th CoRoT Scientific Council : sept M.O. - L.J. 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.

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

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

10 25th CoRoT Scientific Council : sept M.O. - L.J. 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 ?)

11 25th CoRoT Scientific Council : sept M.O. - L.J. 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.

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

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


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