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Table 2
Kepler-39 system parameters.
| Fitted system parameters | Bouchy et al. (2011) | This work (eccentric) | This work (circular) |
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| Orbital period P [days] | 21.0874 ± 0.0002 | 21.087210 ± 0.000037 | 21.087212 ± 0.000030 |
| Transit epoch T0 [BJDTDB − 2 454 900] | 72.5959 ± 0.0006 | 1042.60708 ± 0.00024 | 1042.60707 ± 0.00021 |
| Transit duration T14 [h] | 6.02 ± 0.09 | 5.960 ± 0.020 | 5.960 ± 0.016 |
| Radius ratio Rb/R∗ |
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|
0.0911 ± 0.0006 |
| Inclination i [deg] |
|
89.07 ± 0.22 |
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| Limb-darkening coefficient q1 | – |
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| Limb-darkening coefficient q2 | – |
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– |
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0 (fixed) |
|
– |
|
0 (fixed) |
| Orbital eccentricity e | 0.122 ± 0.023 | 0.112 ± 0.057 | 0 (fixed) |
| Argument of periastron [deg] ω |
|
|
90 (fixed) |
| Radial-velocity semi-amplitude K [ km s-1] | 1.251 ± 0.030 | 1.257 ± 0.064 | 1.201 ± 0.050 |
| Systemic velocity Vr [ km s-1] |
|
−0.063 ± 0.044 |
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| RV jitter [m s-1] sj | – |
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| Derived transit parameters | |||
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| a/R∗ |
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| Stellar density ρ∗ [gcm-3] |
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| Impact parameter b |
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| Limb-darkening coefficient ua | 0.303 ± 0.014 a | 0.31 ± 0.07 | 0.32 ± 0.06 |
| Limb-darkening coefficient ub | 0.308 ± 0.005 a | 0.17 ± 0.14 | 0.15 ± 0.11 |
| Atmospheric parameters of the star | |||
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| Effective temperature Teff[K] | 6260 ± 140 | 6350 ± 100 | 6350 ± 100 |
| Spectroscopic surface gravity log g [cgs] | 4.1 ± 0.2 | 4.40 ± 0.15 | 4.40 ± 0.15 |
| Derived surface gravity log g [cgs] | 4.19 ± 0.07 | 4.25 ± 0.06 | 4.34 ± 0.02 |
| Metallicity [Fe/H] [dex] | –0.29 ± 0.10 | 0.10 ± 0.14 | 0.10 ± 0.14 |
| Stellar rotational velocity Vsini∗ [ km s-1] | 16 ± 2.5 | 16 ± 2.5 | 16 ± 2.5 |
| Spectral type | F8IV | F7V | F7V |
| Stellar and planetary physical parameters | |||
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| Stellar mass [M⊙] |
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| Stellar radius [R⊙] | 1.39 ± 0.11 | 1.40 ± 0.10 | 1.25 ± 0.03 |
| Companion mass Mb [MJup] | 18.0 ± 0.9 |
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19.1 ± 1.0 |
| Companion radius Rb [RJup] |
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1.11 ± 0.03 |
| Companion density ρb [gcm-3] |
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| Companion surface gravity log gb [cgs] | 4.48 ± 0.09 | 4.51 ± 0.05 | 4.58 ± 0.03 |
| Age t [Gyr] | 5.1 ± 1.5 |
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| Orbital semi-major axis a [au] | 0.155 ± 0.003 | 0.164 ± 0.003 | 0.162 ± 0.003 |
| Equilibrium temperature Teq [K]b | 905 ± 39 | 897 ± 29 | 853 ± 14 |
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