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Although OGLE-TR-56b was the second transiting exoplanet discovered, only onelight curve, observed in 2006, has been published besides the discovery data.We present twenty-one light curves of nineteen different transits observedbetween July 2003 and July 2009 with the Magellan Telescopes and Gemini South.The combined analysis of the new light curves confirms a slightly inflatedplanetary radius relative to model predictions, with R_p = 1.378 +/- 0.090 R_J.However, the values found for the transit duration, semimajor axis, andinclination values differ significantly from the previous result, likely due tosystematic errors. The new semimajor axis and inclination, a = 0.01942 +/-0.00015 AU and i = 73.72 +/- 0.18 degrees, are smaller than previouslyreported, while the total duration, T_14 = 7931 +/- 38 s, is 18 minutes longer.The transit midtimes have errors from 23 s to several minutes, and no evidenceis seen for transit midtime or duration variations. Similarly, no change isseen in the orbital period, implying a nominal stellar tidal decay factor ofQ_* = 10^7, with a three-sigma lower limit of 10^5.7.

Twenty-One New Light Curves of OGLE-TR-56b: New System Parameters and Limits on Timing Variations