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Table 6
System parameters from the MCMC analyses.
| Parameter | Symbol | WASP-20 | WASP-28 | Unit |
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| Orbital period | P | 4.8996284 ± 0.0000033 | 3.4088300 ± 0.000006 | d |
| Epoch of mid-transit | T c | 2 455 715.65562 ± 0.00029 | 2 455 290.40519 ± 0.00031 | BJD (UTC) |
| Transit duration | T14 | 0.1418 ± 0.0014 | 0.1349 ± 0.0010 | d |
| Transit ingress/egress duration | T12 = T34 | 0.0264 ± 0.0016 | 0.01441 ± 0.00070 | d |
| Scaled orbital major semi-axis | a/R∗ | 9.28 ± 0.23 | 8.79 ± 0.19 | |
| Planet-to-star area ratio |  / |
0.01164 ± 0.00023 | 0.01300 ± 0.00027 | |
| Impact parameter | b | 0.718 ± 0.018 | 0.21 ± 0.10 | |
| Orbital inclination | i P | 85.56 ± 0.22 | 88.61 ± 0.67 | ° |
| Stellar reflex velocity semi-amplitude | K 1 | 32.8 ± 1.7 | 120.5 ± 4.2 | m s-1 |
| Systemic velocity | γ | 1 316.300 ± 0.089 | 24 216.41 ± 0.43 | m s-1 |
| Offset between HARPS & CORALIE | ΔγHARPS | 19.3 ± 1.3 | 6.0 ± 1.2 | m s-1 |
| Offset between HARPS & CORALIE | ΔγHARPS,orb | 13.31 ± 0.16 | – | m s-1 |
| Eccentricity | e | 0 (adopted; <0.11 at 2 σ) | 0 (adopted; <0.14 at 2 σ) | |
| Sky-projected spin-orbit angle | λ | 12.7 ± 4.2 | 8 ± 18 | ° |
| Sky-projected stellar rotation velocity | vsinI∗ | 4.75 ± 0.51 | 3.25 ± 0.34 | km s-1 |
| Stellar mass | M∗ | 1.200 ± 0.041 | 1.021 ± 0.050 | M⊙ |
| Stellar radius | R∗ | 1.392 ± 0.044 | 1.094 ± 0.031 | R⊙ |
| Stellar surface gravity | log g∗ | 4.231 ± 0.020 | 4.370 ± 0.018 | (cgs) |
| Stellar density | ρ∗ | 0.447 ± 0.033 | 0.784 ± 0.058 | ρ⊙ |
| Stellar effective temperature | Teff | 5940 ± 100 | 6150 ± 140 | K |
| Stellar metallicity | [Fe/H] | −0.008 ± 0.060 | −0.290 ± 0.10 | |
| Planetary mass | MP | 0.311 ± 0.017 | 0.907 ± 0.043 | MJup |
| Planetary radius | RP | 1.462 ± 0.059 | 1.213 ± 0.042 | RJup |
| Planetary surface gravity | log gP | 2.530 ± 0.036 | 3.149 ± 0.028 | (cgs) |
| Planetary density | ρP | 0.099 ± 0.012 | 0.508 ± 0.047 | ρJup |
| Orbital major semi-axis | a | 0.06000 ± 0.00069 | 0.04469 ± 0.00076 | AU |
| Planetary equilibrium temperature | Teql | 1379 ± 31 | 1468 ± 37 | K |
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