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High-precision eclipse photometry for CoRoT planets

High-precision eclipse photometry for CoRoT planets. M. Gillon (Geneva - Liege) & A. Lanotte, T. Barman, B.-O. Demory, A. Triaud, D. Queloz, F. Bouchy, H. Deeg, M. Deleuil, P. Magain, C. Moutou, J. Schneider, B. Tingley. CoRoT symposium 2009 Feb 2 - 5, Paris.

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High-precision eclipse photometry for CoRoT planets

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  1. High-precision eclipse photometry for CoRoT planets M. Gillon (Geneva - Liege) & A. Lanotte, T. Barman, B.-O. Demory, A. Triaud, D. Queloz, F. Bouchy, H. Deeg, M. Deleuil, P. Magain, C. Moutou, J. Schneider, B. Tingley CoRoT symposium 2009 Feb 2 - 5, Paris

  2. Eclipse photometry for CoRoT planets I. Transit photometry Why bother? CoRoT photometry is great! CoRoT-Exo-1 (Barge et al. 2008) CoRoT-Exo-2 (Alonso et al. 2008)

  3. Eclipse photometry for CoRoT planets I. Transit photometry • Limb-darkening + spots effects are large at CoRoT effective wavelength

  4. Eclipse photometry for CoRoT planets I. Transit photometry • Limb-darkening + spots effects are large at CoRoT effective wavelength • Independent determination of system parameters: check for folding effects, depth differences, dilution of the signal, etc…

  5. Eclipse photometry for CoRoT planets I. Transit photometry • Limb-darkening + spots effects are large at CoRoT effective wavelength • Independent determination of system parameters: check for folding effects, depth differences, dilution of the signal, etc… • Improvement of the ephemeris due to the longer baseline (eccentricity)

  6. Eclipse photometry for CoRoT planets I. Transit photometry • Limb-darkening + spots effects are large at CoRoT effective wavelength • Independent determination of system parameters: check for folding effects, depth differences, dilution of the signal, etc… • Improvement of the ephemeris due to the longer baseline (eccentricity) • Transit timing and duration variations

  7. Eclipse photometry for CoRoT planets I. Transit photometry • Limb-darkening + spots effects are large at CoRoT effective wavelength • Independent determination of system parameters: check for folding effects, depth differences, dilution of the signal, etc… • Improvement of the ephemeris due to the longer baseline (eccentricity) • Transit timing and duration variations High cadence sub-mmag transit photometry in a much redder bandpass than CoRoT’s

  8. Eclipse Photometry for CoRoT planets I. Transit photometry Gillon et al. (2008)  = 550 ppm for dT = 54s, 1 transit vs = 300 ppm for dT = 130s (Exo-1, 34 transits) see also Johnson et al. (2008) & Winn et al. (2009)

  9. Eclipse photometry for CoRoT planets II. Occultation photometry • Measurement of the planetary thermal emission at different wavelengths • Broadband spectrum of exoplanets: atmospheric composition and physics (e.g. T inversion, albedo, heat distribution…)

  10. Eclipse photometry for CoRoT planets II. Occultation photometry • Measurement of the planetary thermal emission at different wavelengths • Broadband spectra of exoplanets: atmospheric composition and physics (e.g. T inversion, albedo, heat distribution…) • Occultation timing and duration constrain the orbital eccentricity • Tidal evolution • Tidal heating

  11. Eclipse photometry for CoRoT planets II. Occultation photometry • Measurement of the planetary thermal emission at different wavelengths • Broadband spectra of exoplanets: atmospheric composition and physics (e.g. T inversion, albedo, heat distribution…) • Occultation timing and duration constrain the orbital eccentricity • Tidal evolution • Tidal heating Near-IR mmag to sub-mmag photometry

  12. OGLE-TR-56, 0.9 m TrES-3, 2.2 m De Mooij & Snellen (2009) Sing & Lopez-Morales (2009) Eclipse photometry for CoRoT planets II. Occultation photometry • Spitzer Space Telescope (NASA) • Ground-based measurements!

  13. CoRoT-Exo-1 • 1 transit observed with VLT/FORS in R filter • 1 occultation observed with VLT/HAWK-I in the narrow band filter ND2090 (=2.09 m, width = 20 nm) • Global analysis with CoRoT photometry (36 transits) + SOPHIE RVs using a MCMC algorithm

  14. CoRoT-Exo-1 I. VLT/FORS R-band transit Fixing the ephemeris: transit too late 2  increase of the period -> OK

  15. CoRoT-Exo-1 II. VLT/HAWK-I 2.1m occultation Firm ground-based detection of the thermal emission Occultation is also too late

  16. CoRoT-Exo-1 Global analysis Fixing T0 and letting P vary Good transit fit but occultation seems still to be “too late”

  17. CoRoT-Exo-1 Global analysis Letting e free: e = 0.017 +- 0.07 dF = 0.265 +- 0.035 % -> Tb = 2460 K …preliminary result …

  18. CoRoT-Exo-2 • 1 partial transit observed with VLT/FORS in z-band filter • 1 occultation observed with Spitzer Space Telescope at 4.5 and 8 m • Global analysis with CoRoT photometry + HARPS/CORALIE/SOPHIE RVs using a MCMC algorithm

  19. CoRoT-Exo-2 I. VLT/FORS z-band transit Nice photometry, but incomplete transit will not provide an independent determination of the system parameters

  20. CoRoT-Exo-2 II. Spitzer occultations 4.5 m 8 m PSF blended with nearby fainter star in Spitzer images Deconvolution photometry ongoing See also poster Alonso et al.

  21. Thank you for your attention !

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