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Table 6
Kepler-74 system parameters.
| Fitted system parameters | Hébrard et al. (2013) | This work |
|
|
||
| Orbital period P [days] | 7.340718 ± 0.000001 | 7.340711 ± 0.000006 |
| Transit epoch T0 [BJDTDB − 2 454 900] | 67.3453 ± 0.0003 | 287.56737 ± 0.00014 |
| Transit duration T14 [h] | 2.699 ± 0.038a | 3.082 ± 0.011 |
| Radius ratio Rp/R∗ | 0.090 ± 0.002 | 0.0912 ± 0.0009 |
| Inclination i [deg] | 85.55 ± 0.96 | 87.46 ± 0.07 |
| Limb-darkening coefficient q1 | – |
|
| Limb-darkening coefficient q2 | – |
|
| Orbital eccentricity e | 0.287 ± 0.062 | 0 (fixed) |
| Argument of periastron ω [deg] | 64 ± 21 | – |
| Radial-velocity semi-amplitude K [ m s-1] | 58 ± 7 | 59 ± 11 |
| HARPS-N systemic velocity Vr,HN [ km s-1] | 19.356 ± 0.008 | 19.366 ± 0.009 |
| HARPS-N RV jitter [ m s-1] sj,HN | < 5 |
|
| SOPHIE systemic velocity Vr,SO [ km s-1] |
|
19.290 ± 0.014 |
| SOPHIE RV jitter [ m s-1] sj,SO | 28 ± 13 |
|
| Derived transit parameters | ||
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|
||
| a/R∗ |
|
15.47 ± 0.18 |
| Stellar density ρ∗ [gcm-3] |
|
|
| Impact parameter b | 0.684 ± 0.032 | 0.685 ± 0.011 |
| Limb-darkening coefficient ua |
|
0.35 ± 0.17 |
| Limb-darkening coefficient ub | 0.6 ± 0.4 |
|
| Atmospheric parameters of the star | ||
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|
||
| Effective temperature Teff[K] | 6050 ± 110 | 6000 ± 100 |
| Spectroscopic surface gravity log g [cgs] | 4.2 ± 0.1 | 4.5 ± 0.10 |
| Derived surface gravity log g [cgs] | 4.2 ± 0.1 | 4.44 ± 0.01 |
| Metallicity [Fe/H] [dex] | 0.34 ± 0.14 | 0.42 ± 0.11 |
| Stellar rotational velocity Vsini∗ [ km s-1] | 5.0 ± 1.0 | 5.0 ± 1.0 |
| Spectral type | F8V | F8V |
| Stellar and planetary physical parameters | ||
|
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||
| Stellar mass [M⊙] |
|
1.18 ± 0.04 |
| Stellar radius [R⊙] | 1.51 ± 0.14 | 1.12 ± 0.04 |
| Planetary mass Mp [MJup] | 0.68 ± 0.09 | 0.63 ± 0.12 |
| Planetary radius Rp [RJup] | 1.32 ± 0.14 | 0.96 ± 0.02 |
| Planetary density ρp [gcm-3] | 0.37 ± 0.13 | 0.88 ± 0.18 |
| Planetary surface gravity log gp [cgs] | 2.98 ± 0.11 | 3.23 ± 0.10 |
| Age t [Gyr] |
|
|
| Orbital semi-major axis a [au] | 0.084 ± 0.014 | 0.0781 ± 0.0007 |
| Equilibrium temperature Teq [K]b | 1250 ± 120 | 1078 ± 19 |
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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