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A GTC RV survey of COROT stars

A GTC RV survey of COROT stars. Eduardo Martin, Hans Deeg, Herve Bouy, Maria Rosa Zapatero Osorio Instituto de Astrofísica de Canarias Jian Ge University of Florida Victor Sanchez Bejar Grantecan. The telescope: 10.4-m GTC. The instrument: Multiple Object Exoplanet Tracker.

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A GTC RV survey of COROT stars

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  1. A GTC RV survey of COROT stars Eduardo Martin, Hans Deeg, Herve Bouy, Maria Rosa Zapatero Osorio Instituto de Astrofísica de Canarias Jian Ge University of Florida Victor Sanchez Bejar Grantecan

  2. The telescope: 10.4-m GTC

  3. The instrument: Multiple Object Exoplanet Tracker Jian Ge, University of Florida UF staff: X. Wan (instrument scientist), A. Hariharan (ME), B. Zhao (optical engineer), C. Werner (Software engineer) UF Grads: S. Mahadevan (Michelson fellow), J. van Eyken (Michelson fellow), C. DeWitt, P. Guo, R. Cohen, A. vanden Heuvel Contact: jge@astro.ufl.edu, 352-392-2052 ext. 228

  4. Prototype ET setup at the Sloan telescope basement in March and April 2005 ET interferometer and spectrograph ET 4kx4k detector camera Spectrograph Interferometer 25 fibers

  5. First Light 20 stellar spectra obtained simultaneously with a multiple object ET instrument at the Sloan 2.5 meter telescope, the brightest star with V = 8 and the faintest with V = 11, 30 min exposure on Mar 21 2005 Stellar Fringes shown in multiple stars for Precision Doppler Measurements

  6. Preliminary Results from the Feasibility Observations at Sloan • ~ 10 m/s Doppler precision • ~ 16 m/s stability over 5-days • Uncover part of the Doppler curve of a planet-bearing star, 55 CnC • detect a possible companion around a V = 10.4 star

  7. P=6 days, 0.5 Jupiter mass, rms velocity error = 22 m/s One of the Strongest Planet Candidates Discovered by the Single Object ET at the KPNO 0.9 Meter Coude Feed in 2005 Doppler curve over two months V = 8.4, ~25 min exposures

  8. ET upgrade for the GTC • Visiting instrument located at one Nasmyth focus • 100 fibers • 20 sq. arcmin FOV • Precision, texp=10 min, 2m/s for V=11, 6m/s for V=15

  9. Framework • ESO-Spain negotiations => public surveys with GTC as “in kind” contribution=>15-30 nights per year for 3 years • COROT photometric monitoring of 60,000 stars to search for exoplanet transits=>rotation periods, stellar activity

  10. Our proposal • RV survey of about 30,000 COROT stars with GTC/ET. 45 nights. 2008-2010. • 4 RV points per star over 3 years. Data release in 2011. • Follow-up of interesting stars coordinated with other telescopes.

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