As part of our ongoing effort to measure exoplanet sizes and transit times with greater accuracy, we present I-band observations of two transits of OGLE-TR-111b. The photometry has an accuracy of 0.15%-0.20% and a cadence of 1-2 minutes. We derive a planetary radius of RP = 1.067 ± 0.054RJup and a stellar radius of RS = 0.831 ± 0.031 R⊙. The uncertainties are dominated by errors in the photometry rather than by systematic errors arising from uncertainties in the limb-darkening function or the stellar mass. Both the stellar radius and the planetary radius are in agreement with theoretical expectations. The transit times are accurate to within 30s and allow us to refine the estimate of the mean orbital period: 4.0144479 ± 0.0000041 days.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science
- Planetary systems
- Stars: individual (OGLE-TR-111)
- Techniques: photometric