MILLIMAGNITUDE PHOTOMETRY FOR TRANSITING EXTRASOLAR PLANETARY CANDIDATES. Ⅱ. TRANSITS OF OGLE-TR-113-b IN THE OPTICAL AND NEAR-IR

摘要

We present precise V- and K_s-band transit photometry for the planetary host star OGLE-TR-113. Using the K_s-band photometry, we confirm the dwarf nature of OGLE-TR-113 and obtain new estimates for its effective temperature, distance, and reddening. We employ the Ⅴ-band photometry to obtain planetary and orbit parameters from the transit fit, a = 0.0232 ± 0.0038 AU, orbital period P = 1.4324752 ± 0.0000015 day, i = 86.7-90, and R_p = 1.09 ± 0.09 R_J. These values are in excellent agreement with previous works. Assuming a mass M_p = 1.32 ± 0.19 M_J for the planet, we obtain its mean density ρ = 1.26 ± 0.50 g cm~(-3), also in agreement with previous works. The transit observed in the K_s band has a larger scatter, and we find its amplitude to be consistent with that in the Ⅴ band. In this way, we find an independent confirmation of the planetary nature of OGLE-TR-113b.