Characterization of extrasolar planetary transiting candidates II

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We present a second paper of fully characterization of a sample of stars whose low-depth transits were discovered by the OGLE-III campaign in order to select the most promising candidates for spectroscopic confirmation, following the same analysis done in Gallardo et al. (2005). We present new optical and near-IR photometry, deriving physical parameters like effective temperature (Teff), distance (d), the stellar radii (R*) and the companion radii (Rc). We selected eight M (2800 K ≤ Teff ≤ 3850 K) or K (3850 K ≤ Teff ≤ 5150 K) spectral type stellar objects as potential candidates to host exoplanets, even though, considering the radii of their companions, only stars OGLE-TR-61, OGLE-TR-74, OGLE-TR-123 and OGLE-TR-173 are the most promising M-type transit candidates to host planets. Confirmation of the planetary nature of any of these objects will yield another transiting extrasolar planet orbiting a M-type star, or even more interesting, the first extrasolar planets orbiting a late M-type dwarf of effective temperature about 2900 K.