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Table 7
Kepler-75 system parameters.
| Fitted system parameters | Hébrard et al. (2013) | This work |
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| Orbital period P [days] | 8.884924 ± 0.000002 | 8.8849116 ± 0.0000034 |
| Transit epoch T0 [BJDTDB − 2 454 900] | 102.9910 ± 0.0002 | 840.44030 ± 0.00012 |
| Transit duration T14 [h] | 1.872 ± 0.025a | 2.0778 ± 0.0084 |
| Radius ratio Rp/R∗ | 0.121 ± 0.002 |
|
| Inclination i [deg] |
|
|
| Limb-darkening coefficient q1 | – | 0.36 ± 0.08 |
| Limb-darkening coefficient q2 | – |
|
|
0.337 ± 0.020 | |
|
0.676 ± 0.013 | |
| Orbital eccentricity e | 0.569 ± 0.010 | 0.570 ± 0.010 |
| Argument of periastron ω [deg] | 63.6 ± 1.4 | 63.5 ± 1.7 |
| Radial-velocity semi-amplitude K [ km s-1] | 1.288 ± 0.024 | 1.287 ± 0.025 |
| HARPS-N systemic velocity Vr,HN [ km s-1] | −64.175 ± 0.050 | −64.180 ± 0.056 |
| HARPS-N RV jitter [ m s-1] sj,HN | < 17 | < 54 |
| SOPHIE systemic velocity Vr,SO [ km s-1] | −64.235 ± 0.012 | −64.236 ± 0.014 |
| SOPHIE RV jitter [ m s-1] sj,SO | < 8 | < 8 |
| Derived transit parameters | ||
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| a / R ∗ | 19.6 ± 0.6 |
|
| Stellar density ρ∗ [gcm-3] | 1.79 ± 0.17 |
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| Impact parameter b | 0.14 ± 0.14 |
|
| Limb-darkening coefficient ua | 0.53 ± 0.09 | 0.50 ± 0.05 |
| Limb-darkening coefficient ub | 0.13 ± 0.26 | 0.09 ± 0.12 |
| Atmospheric parameters of the star | ||
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||
| Effective temperature Teff[K] | 5330 ± 120 | 5200 ± 100 |
| Spectroscopic surface gravity log g [cgs] | 4.55 ± 0.14 | 4.60 ± 0.15 |
| Derived surface gravity log g [cgs] | 4.5 ± 0.1 | 4.50 ± 0.02 |
| Metallicity [Fe/H] [dex] | –0.07 ± 0.15 | 0.30 ± 0.12 |
| Stellar rotational velocity Vsini∗ [ km s-1] | 3.5 ± 1.5 | 3.5 ± 1.5 |
| Spectral type | G8V | K0V |
| Stellar and planetary physical parameters | ||
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| Stellar mass [M⊙] | 0.88 ± 0.06 | 0.91 ± 0.04 |
| Stellar radius [R⊙] | 0.88 ± 0.04 | 0.89 ± 0.02 |
| Planetary mass Mp [MJup] | 9.9 ± 0.5 | 10.1 ± 0.4 |
| Planetary radius Rp [RJup] | 1.03 ± 0.06 | 1.05 ± 0.03 |
| Planetary density ρp [gcm-3] | 11 ± 2 |
|
| Planetary surface gravity log gp [cgs] | 4.36 ± 0.03 | 4.36 ± 0.03 |
| Age t [Gyr] | 6 ± 3 |
|
| Orbital semi-major axis a [au] | 0.080 ± 0.005 | 0.0818 ± 0.0012 |
| Equilibrium temperature at the averaged distance Teq [K]b | 850 ± 40 | 767 ± 16 |
Notes.
(a)
This value of transit duration is not accurate enough because it was estimated with the approximated formula reported in Winn (2010). Indeed, the transit duration is not a free parameter in the transit model adopted by Hébrard et al. (2013).
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