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The observation of exoplanet transit events in China

The observation of exoplanet transit events in China. Xiao-bin Wang 1 , Sheng-hong Gu 1 , Andrew Collier Cameron 2 , Xiang-song Fang 1 , Dong-tao Cao 1 and Zhi-liang Guo 1 1.Yunnan Observatory, CAS, China 2.University of St. Andrews, UK Shanghai 2009.07.21. Outline. Background

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The observation of exoplanet transit events in China

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  1. The observation of exoplanet transit events in China Xiao-bin Wang1, Sheng-hong Gu1, Andrew Collier Cameron2, Xiang-song Fang1, Dong-tao Cao1 and Zhi-liang Guo1 1.Yunnan Observatory, CAS, China 2.University of St. Andrews, UK Shanghai 2009.07.21

  2. Outline • Background • Observation • Data reduction • Light curve analysis • Future plan

  3. Background • It is known well that the transit of exoplanet can provide information about its radii and orbital inclination which can be used to derive its mass and density, furthermore, to infer the clue on its formation and evolution. • The monitoring for changes on orbital inclination, transit time and duration makes it possible to detect other low-mass exoplanets. • Here, we give out the preliminary results of our follow-up observation on transit events and future plan on this topic in China.

  4. Observation • Instruments • 1.0m telescope+2Kx2K CCD at Yunnan Observatory • R filter

  5. 85cm telescope+1Kx1K CCD at Xinglong station of NAOC. • R filter

  6. Targets: • SuperWASP project: WASP-1b, WASP-2b, WASP-11b… • XO project: XO-2b, XO-3b… • HATNet project: HAT-P-1b, HAT-P-9b… • CoRoT project: CoRoT-Exo-1b…

  7. Data reduction • Photometry • Aperture photometry (uncrowded field) • IRAF package • Image subtraction (crowded field) • ISIS package (Alard & Lupton 1998, Alard 2000)

  8. Two examples

  9. Remove the systematic errors for aperture photometry results • Coarse decorrelation (Collier Cameron et al. 2006) • SysRem algorithm (Tamuz et al. 2005)

  10. WASP-11b

  11. XO-2b

  12. Light curve analysis • Markov Chain Monte Carlo code (Collier Cameron et al. 2007)

  13. Result 1: WASP-11b

  14. Transit epoch=2454793.18411+0.00018-0.00018Transit depth=0.0217+0.0002-0.0003magTransit width=0.09579+0.00072-0.00342daysStellar mass=0.77+0.01-0.007M_sunStellar radius=0.81+0.01-0.006R_sunOrbital inclination=89.976+ -0.241-0.749 degPlanet radius=1.02+0.01-0.009R_jup

  15. Result 2: XO-2b

  16. Transit epoch=2454804.32478+0.00021-0.00027 Transit depth=0.0132+0.0006 - -0.0001 mag Transit width=0.09853+ -0.00266-0.01995 days Stellar mass=0.968+0.014-0.008 M_sun Stellar radius=0.975+0.011-0.006R_sun Orbital inclination=88.982+ -0.443-1.616 deg Planet radius=0.955+0.028- -0.002 R_jup

  17. Future plan • New instruments • Lijiang 2.4m telescope • CCD camera: 2Kx2K chip, FOV 4’x4’ • YFOSC CCD camera: 4Kx4K chip, FOV 9’X9’ • Mosaic CCD camera: 6Kx6K, 4chips, FOV 9’x9’ • LiJET: LiJiang Exoplanet Tracker (see Ting-gui Wang’s talk yesterday)

  18. Research projects • Defocus observation for transit events • Improve the accuracy of transit light curves • Open cluster transit survey • Discover new transit exoplanet candidates • LiJET follow-up confirmation for the brighter ones of them

  19. Thank you!

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