Table 2: Parameters of the OGLE-TR-123 system (the primary mass and radius are estimated with the help of stellar evolution models).
Period [days] 1.803865 $\pm$ 0.000001
Transit epoch [BJD] 2453459.6096$\pm$ 0.0005
Impact parameter 0 $\pm$ 0.27
Radius ratio 0.0856 $\pm$ 0.0014
Transit duration [days] 0.1279 $\pm$ 0.0014
Eccentricity (fixed) 0.0
Inclination angle [degrees] 86 - 90
Temperature of the primary [K] 6700 $\pm$ 300
Rotation velocity [km s-1] 34 $\pm$ 3
Systemic velocity [km s-1] 0.487 $\pm$ 0.204
Orbital semi-amplitude [km s-1] 11.967 $\pm$ 0.280
Mass function $(0.3210 \pm 0.0225)\times 10^{-3}$
Residuals O-C [km s-1] 0.523
Semi-major axis [AU] 0.031 $\pm$ 0.002
Distance 1600 $\pm$ 400 pc
Primary mass 1.29 $\pm$ 0.26 $M_\odot $
Primary radius 1.55 $\pm$ 0.10 $R_\odot$
Secondary mass 0.085 $\pm$ 0.011 $M_\odot $
Secondary radius 0.133 $\pm$ 0.009 $R_\odot$


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