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We present limits on transit timing variations and secondary eclipse depthvariations at 8 microns with the Spitzer Space Telescope IRAC camera. Due tothe weak limb darkening in the infrared and uninterrupted observing, Spitzerprovides the highest accuracy transit times for this bright system, inprinciple providing sensitivity to secondary planets of Mars mass in resonantorbits. Finally, the transit data provides tighter constraints on thewavelength- dependent atmospheric absorption by the planet.

Transits and secondary eclipses of HD 189733 with Spitzer