Although OGLE-TR-56b was the second transiting exoplanet discovered , only one light curve , observed in 2006 , has been published besides the discovery data .
We present twenty-one light curves of nineteen different transits observed between July 2003 and July 2009 with the Magellan Telescopes and Gemini South .
The combined analysis of the new light curves confirms a slightly inflated planetary radius relative to model predictions , with R _ { p } = 1.378 \pm 0.090 R _ { J } .
However , the values found for the transit duration , semimajor axis , and inclination values differ significantly from the previous result , likely due to systematic errors .
The new semimajor axis and inclination , a = 0.01942 \pm 0.00015 AU and i = 73.72 \pm 0.18 ^ { \circ } , are smaller than previously reported , while the total duration , T _ { 14 } = 7931 \pm 38 s , is 18 minutes longer .
The transit midtimes have errors from 23 s to several minutes , and no evidence is seen for transit midtime or duration variations .
Similarly , no change is seen in the orbital period , implying a nominal stellar tidal decay factor of Q _ { * } = 10 ^ { 7 } , with a three-sigma lower limit of 10 ^ { 5.7 } .