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Table 1

Stellar and planetary parameters for the Tau Boo, HD 179949, and HD 189733 systems.

Stellar parameters

Parameter Tau Boo HD 179949 HD 189733
Spectral type F7V F8V K2V
Rotation period (days) 3 7.6 12.5
Mass (M) 1.34 1.21 0.82
Radius (R) 1.46 1.19 0.76
Distance (pc) 15.6 27.5 19.8

Planetary parameters

Mass (MJ) 5.95 0.916 1.13
Radius (RJ) 1.06 1.2 1.1
Orbital period (days) 3.3 3.09 2.2
Semi-major axis (AU) 0.048 0.040.00046+0.00045$\[0.04_{-0.00046}^{+0.00045}\]$ 0.03153±0.00011
Eccentricity 0.0114±0.006 0.0160.011+0.017$\[0.016_{-0.011}^{+0.017}\]$ 0.0270.018+0.021$\[0.027_{-0.018}^{+0.021}\]$

Notes. The “stellar parameters” row at the top lists the host star properties, including rotation period, mass, radius, and distance taken from Chebly et al. (2023) and references therein. The “exoplanet parameters” row provides the planetary properties: radii and masses are from Rosenthal et al. (2021) for Tau Boo b, Brogi et al. (2012) for HD 179949 b, and Kokori et al. (2023) for HD 189733 b. The orbital periods are assumed equal to planetary rotation periods, based on the assumption that close-in planets, such as hot Jupiters, are tidally locked. Eccentricities are taken from Stassun et al. (2017); Rosenthal et al. (2021), and semi-major axes from Rosenthal et al. (2021) for Tau Boo b and HD 179949 b, while for HD 189733 b, it is taken from Kokori et al. (2023).

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