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Table 3

The parameters of C0121-B from the combined lightcurve and RV modeling.

Symbol Parameter name Value Units

Orbital parameters
P Period 36.2873 ± 0.0025 day
ecosω Eccentricity  ×  Cosine Longitude of periastron 0.0331 ± 0.0003
esinω Eccentricity  ×  Sine Longitude of periastron
K RV semiamplitude 62.2 ± 0.5  km s-1
γ Center-of-mass RV at JD = 2 454 889 14.5 ± 0.6  km s-1
Center-of-mass acceleration 20.6 ± 2.8 m s-1 d-1
T Time of periastron (calculated analytically) 2   454   876.7 ± 0.7 JD

Photometric parameters
T0 Time of center of primary eclipse 2   454   844.9152 ± 0.0020 JD
Js Surface-brightness ratio (secondary/primary) 0.61 ± 0.23
rt Fractional sum of radii 0.049 ± 0.006
k Ratio of radii (secondary/primary) 0.60 ± 0.25
x Impact parameter
L3 Third-light (blending) fraction 0.86 ± 0.04
up Limb-darkening coefficient of primary (fixed) 0.55
us Limb-darkening coefficient of secondary (fixed) 0.58

Other estimated parameters
i inclination (see Eq. (2)) degree
aBb Semimajor axis of secondary 0.2076 ± 0.0017 AU
f Mass function of Bb 0.903 ± 0.022 M
q Mass ratio (MBa/MBb) assuming MBb = 1.3 M 1.73 ± 0.03
FBb:FBa The Bb:Ba flux ratio

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