Characterisation of extrasolar planetary transit candidates

摘要: The detection of transits is an efficient technique to uncover faint companions around stars. full characterisation the (M-type stars, brown dwarfs or exoplanets) requires high-resolution spectroscopy measure properly masses and radii. With advent massive variability surveys over wide fields, large number possible candidates makes such a for all them impractical. We explore here fast pre-select most promising using either near-IR photometry low resolution spectroscopy. develop new method based on well-calibrated surface brightness relation along with correlation between mass luminosity main sequence so that not only can giant stars be excluded but also accurate effective temperatures radii measured. source uncertainty arises from unknown dispersion extinction at given distance. apply this our observations sample 34 extracted 62 low-depth identified by OGLE during their survey some 10 5 in Carina fields Galactic disc. infer least 78% which are well characterised exoplanets. Stars OGLE-TR-105, OGLE-TR-109 OGLE-TR-111 likeliest host exoplanets deserve follow-up studies. Most recently, was confirmed as exoplanet $M_{\rm planet} \cong 0.53 \pm 0.11 ~M_{\rm Jup}$ (Pont et al. [CITE]), confirming efficiency pre-selecting reliable planetary transit candidates.