Three interesting transits: OGLE-TR-109, OGLE-TR-111, and OGLE-TR-113

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Scientific paper

We started a program to monitor photometrically the OGLE transiting extrasolar planet candidates. VLT images in the V-band are used to make light curves of transits of confirmed OGLE planets. The data for some of the targets are complemented with NTT K-band images. Using difference image photometry, we are able to achieve milli-mag errors in the individual data points. Here we discuss three examples: OGLE-TR-109, OGLE-TR-111 and OGLE-TR-113. The main transits of these hot Jupiters are well defined. The analysis of the light curves allows to measure improved transit amplitudes and ephemerides.

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