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Some preliminary results from the exochannel

Some preliminary results from the exochannel. From the run: IRa 01 Data: R. Alonso, R. Cautain, P-Y Chabaud, C. Chardes, L. Jorda, C. Surace, …

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Some preliminary results from the exochannel

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  1. Some preliminary resultsfrom the exochannel From the run: IRa 01 Data: R. Alonso, R. Cautain, P-Y Chabaud, C. Chardes, L. Jorda, C. Surace, … Follow-up: C. Moutou, M. Deleuil, M. Barbieri, H. Deeg, A. Hatzes, H. Rauer, A. Erikson, S. Aigrain, A. Shporer, D. Rouan, …

  2. Present status of the alarm mode • File transfer between LESIA, IAS and LAM are now working • N0 -> N1 pipeline ready , concatenation of data ready …. but not in the production mode N1 data should be soon available • Data presently available at LAM: • Unconcatenated N0 products • One week samples of LCs (build from N0 products) • A few light curves on the complete run duration • The « alarm » pipeline is not in the production mode  Tests have been made using N0 data(detection and follow up)

  3. From N0 data … … to preliminary LCs • What we have made: • Data were put in the appropriate format • Various pieces concanenated in LCs • Impacts of « cosmic rays » removed • Detrending from low frequency variations • Removal of systematics using PCA (only for some thousands of windows) Only hand made, not a pipeline !

  4. A first and quick look

  5. Eclipsing binaries mv = 12.76 11% 13% mv = 13.42 6%

  6. 0.4% 0.2% 0.5% Variables stars mv = 13.02 mv = 12.43

  7. … also some problems

  8. Planet candidates A number of planet candidates identified in a few 1000 LCs. Two good candidates with series of deep transits (few %): • One has a period of 5.8 days • The other has a period of 1.5 days Use of archived data: EXODAT (1 candidate observed by BEST)  Follow Up triggered for the two candidates: • Photometry : IAC80cm, Wise 1m, BEST, CFHT/Megacam • Spectroscopy : Tautenburg, SOPHIE • Archived data : BEST (1 candidate), EXODAT

  9. First candidate: COROT_001

  10. COROT_001: Detrended LC

  11. COROT_001: Folded LC

  12. COROT_001: Ellipsoidal variation

  13. COROT_001: a secondary transit

  14. COROT_001:Results from the F-Up • Radial velocity variations obtained from Tautenburg/1m • Transit on the sentral star confirmed with IAC/80cm

  15. COROT_001 is an eclipsing binary - the primary is a 0.9 M G5V star- the companion is a M star of 0.128 M

  16. COROT_002: Light-curve

  17. COROT_002: Detrended LC

  18. COROT_002: Folded LC

  19. COROT_002: no elipsoidal variation

  20. COROT_002: no secondary transit No feature down to the 3.e-5 level

  21. COROT_002: follow up • SOPHIE: radial velocity variations compatible with the LC (220+-20m/s) • Bisector analysis: not a triple system • Analysis of SOPHIE spectra: 6000K dwarf star (to be confirmed) • Star mass ~ 1.17 (0.33) M • Planet mass ~ 1.32 (0.25) MJup

  22. COROT_002 host a planet: - the planet is a very hot (1.5days) giant one: RP~ 1.78 (+ 0.3,-0.2) RJup MP ~ 1.32 (0.25) Mjup- the star is a dwarf (~ 6000K) with: M ~ 1.17 (0.33) M and R ~ 1.2 (-0.2,+0.1) R(parameters to be improved with higher resolution spectra)

  23. What we learned also … • Confrontation space/ground • Transit found deeper from the ground than from space …! • Scattered light from the Earth can explain the difference (correction with an approximate value of 640e-/px/32sec) Background correction by hand ! • We have to improve our organisation for the F-Up

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