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Table 5
Kepler-44 system parameters.
| Fitted system parameters | Bonomo et al. (2012a) | This work |
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|
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| Orbital period P [days] | 3.246740 ± 0.000018 | 3.2467293 ± 0.0000030 |
| Transit epoch T0 [BJDTDB − 2 454 900] | 166.3781 ± 0.0004 | 287.15640 ± 0.00021 |
| Transit duration T14 [h] | 3.218 ± 0.043 | 3.124 ± 0.014 |
| Radius ratio Rp/R∗ | 0.0844 ± 0.0011 | 0.0828 ± 0.0008 |
| Inclination i [deg] |
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|
| Limb-darkening coefficient q1 | – |
|
| Limb-darkening coefficient q2 | – |
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|
– |
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– | 0.03 ± 0.20 |
| Orbital eccentricity e | < 0.021 | < 0.066 |
| Radial-velocity semi-amplitude K [ m s-1] | 124 ± 5 | 125 ± 11 |
| Systemic velocity Vr [ km s-1] | −35.892 ± 0.004 | −35.892 ± 0.009 |
| RV jitter [ m s-1] sj | – | < 7 |
| Derived transit parameters | ||
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| a/R∗ |
|
|
| Stellar density ρ∗ [gcm-3] |
|
0.63 ± 0.10 |
| Impact parameter b |
|
0.62 ± 0.02 |
| Limb-darkening coefficient ua | 0.420 ± 0.026 a | 0.42 ± 0.13 |
| Limb-darkening coefficient ub | 0.248 ± 0.017 a | 0.21 ± 0.19 |
| Atmospheric parameters of the star | ||
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||
| Effective temperature Teff[K] | 5757 ± 134 | 5800 ± 100 |
| Metallicity [Fe/H] [dex] | 0.26 ± 0.10 | 0.15 ± 0.10 |
| Spectroscopic surface gravity log g [cgs] | 4.59 ± 0.14 | 4.1 ± 0.1 |
| Derived surface gravity log g [cgs] | 4.15 ± 0.06 | 4.22 ± 0.04 |
| Stellar rotational velocity Vsini∗ [ km s-1] | 4 ± 2 | 4 ± 2 |
| Spectral type | G2IV | G2IV |
| Stellar and planetary physical parameters | ||
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| Stellar mass [M⊙] | 1.19 ± 0.10 | 1.12 ± 0.08 |
| Stellar radius [R⊙] | 1.52 ± 0.09 | 1.35 ± 0.08 |
| Planetary mass Mp [MJup] | 1.02 ± 0.07 | 1.00 ± 0.10 |
| Planetary radius Rp [RJup] | 1.24 ± 0.07 | 1.09 ± 0.07 |
| Planetary density ρp [gcm-3] | 0.65 ± 0.12 |
|
| Planetary surface gravity log gp [cgs] | 3.21 ± 0.05 | 3.31 ± 0.06 |
| Age t [Gyr] |
|
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| Orbital semi-major axis a [au] | 0.0455 ± 0.0013 | 0.0446 ± 0.0011 |
| Equilibrium temperature Teq [K]b | 1603 ± 51 | 1544 ± 47 |
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