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Table 6
Physical properties of the KOI-1257 systems.
| Parameter | Median value and 68.3% uncertainty | 99% confidence interval |
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| Planet orbital parameters | ||
| Orbital period Pin [d] | 86.647661 ±3.4 × 10-5 | [86.647576−86.647746] |
| Semi-major axis ain [AU] | 0.382 ± 0.006 | [0.366−0.398] |
| Transit epoch T0 [BJDTDB− 2 455 000] | 6.79454 ±3.0 × 10-4 | [6.79370−6.79538] |
| Orbital inclination iin [°] | 89.66 |
[88.46−89.97] |
| Orbital eccentricity ein | 0.772 ± 0.045 | [0.60−0.88] |
| Argument of periastron ωin [°] | 141.3 ± 17 | [31−171] |
| Spin-orbit absolute angle | λ | [°] | 74 |
[0−180] |
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| Binary orbital parameters | ||
| Orbital period Pout [d] | 3430 ± 1200 | [1030−5830] |
| Semi-major axis aout [AU] | 5.3 ± 1.3 | [2.7−7.9] |
| Periastron epoch Tp [BJDTDB− 2 450 000] | 8000 |
[5145−14 545] |
| Orbital inclination iout [°] | 18.2 |
[8.2−85.2] |
| Orbital eccentricity eout | 0.31 |
[0.02−0.90] |
| Argument of periastron ωout [°] | 180 ± 110 | [0−360] |
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| Primary star parameters | ||
| Effective temperature Teff⋆1 [K] | 5520 ± 80 | [5320−5720] |
| Surface gravity log g⋆1 [cm s-2] | 4.32 ± 0.10 | [4.03−4.51] |
| Iron abundance [Fe/H]⋆1 [dex] | +0.27 ± 0.09 | [0.02−0.52] |
| Microturbulence velocity [km s-1] | 0.80 | − |
| Macroturbulence velocity [km s-1] | 1.7 | − |
| Stellar mass M⋆1 [M☉] | 0.99 ± 0.05 | [0.86−1.12] |
| Stellar radius R⋆1 [R☉] | 1.13 ± 0.14 | [0.90−1.63] |
| Stellar bulk density ρ⋆1 [ρ⊙] | 0.70 ± 0.25 | [0.05−1.35] |
| Sky-projected rotational velocity υsini⋆1 [km s-1] | 4.6 ± 0.2 | [4.0−4.9] |
| Spectral type | G5V | − |
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| Secondary star parameters | ||
| Effective temperature Teff⋆2 [K] | 4270 ± 290 | [3070−4960] |
| Surface gravity log g⋆2 [cm s-2] | 4.62 ± 0.05 | [4.51−5.20] |
| Stellar mass M⋆2 [M☉] | 0.70 ± 0.07 | [0.11−0.84] |
| Stellar radius R⋆2 [R☉] | 0.68 ± 0.07 | [0.13−0.83] |
| Stellar bulk density ρ⋆2 [ρ⊙] | 2.2 ± 0.5 | [1.8−40.2] |
| Sky-projected rotational velocity υsini⋆2 [km s-1] | 2.6 ± 2.0 | [0.3−17.6] |
| Spectral type | K6V/K7V | – |
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| Planet physical parameters | ||
| Planet mass mp [M♃] | 1.45 ± 0.35 | [0.05−2.36] |
| Planet radius rp [R♃] | 0.94 ± 0.12 | [0.75−1.34] |
| Planet bulk density ρp [g cm-3] | 2.1 ± 1.2 | [0.1−5.1] |
| Equilibrium temperature Teq [K] | 511 ± 50 | [380−640] |
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| System parameters | ||
| Distance from Earth D [pc] | 900 ± 110 | [710−1220] |
| Interstellar absorption E(B − V) | 0.097 ± 0.040 | [0.000−0.200] |
| Systemic radial velocity γ [km s-1] | 8.8 ± 0.4 | [7.7−9.9] |
| System age τ [Gyr] | 9.3 ± 3.0 | >1.55 |
Notes. Adopted values: M☉ = 1.98842 1030 kg; R☉ = 695 508 km; M♃ = 1.89852 1027 kg; R♃ = 71 492 km; 1 AU = 149 597 870 700 m.
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