Table 2
Physical parameters of the K2-110 system.
| Parameter | Value and uncertainty |
|
|
|
| Stellar parameters | |
| Stellar mass M⋆ [M⊙] | 0.738 ± 0.018 |
| Stellar radius R⋆ [R⊙] | 0.713 ± 0.020 |
| Stellar age τ [Gyr] | 8 ± 3 |
| Distance d [pc] | 118.0 ± 3.6 |
| Reddening E(B−V) [mag] | 0.019 |
| Systemic RV υ0 [km s-1] | –21.6331 ± 9 × 10-4 |
| Effective temperature Teff [K] | 5010 ± 50 |
| Surface gravity log g [g cm-2] | 4.60 ± 0.03 |
| Iron abundance [Fe/H] [dex] | –0.34 ± 0.03 |
| Spectral type | K3V |
|
|
|
| Orbital parameters | |
| Period P [d] | 13.86375 ± 2.6× 10-4 |
| Transit epoch T0 [BJDTDB] | 2 457 275.32992 ±6.1 × 10-4 |
| Orbital eccentricity e | 0.079 ± 0.07 |
| Argument of periastron ω [°] | 90 |
| Inclination i [°] | 89.35  |
| Semi-major axis a [AU] | 0.1021 ± 8× 10-4 |
|
|
|
| Transit and radial velocity parameters | |
| System scale a/R⋆ | 30.8 ± 1.0 |
| Impact parameter b | 0.34  |
| Transit duration T14 [h] | 3.22 ± 0.03 |
| Planet-to-star radius ratio kr | 0.0333 ±6.6 × 10-4 |
| Limb darkening ua | 0.5322 ± 1.2 × 10-2 |
| Limb darkening ub | 0.1787 ± 8 × 10-3 |
| RV amplitude K [m.s-1] | 5.5 ± 1.1 |
| HARPS-N RV jitter [m s-1] | 3 ± 2 |
| HARPS RV jitter [m s-1] | 3.1 ± 1 |
| Instrument offset [m s-1] | 4.2 ± 1.8 |
| K2 contamination [flux, ppt] |
|
| K2 jitter [flux, ppm] | 40 ± 4.6 |
| SED jitter [mag] | 0.02 ± 0.02 |
|
|
|
| Planet parameters | |
| Planet mass Mp [M⊕] | 16.7 ± 3.2 |
| Planet radius Rp [R⊕] | 2.592 ± 0.098 |
| Planet density ρp [g cm-3] | 5.2 ± 1.2 |
| Equilibrium temperature Teq [K] | 640 ± 20 |
Notes. All the uncertainties provided here are only the statistical ones. Errors on the models are not considered, as they are unknown. Stellar parameters are derived from the combined analysis of the data and not from the spectral analysis. We assumed R⊙ = 695 508 km, M⊙ = 1.98842 × 1030 kg, R⊕ = 6 378 137 m, M⊕ = 5.9736 × 1024 kg, and 1 AU = 149 597 870.7 km.
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