Table 2
MCMC-derived properties of the WASP-8 system.
| Scenario | veq (km s-1) | i⋆ (°) | α | λ (°) | c0 (km s-1) | c1 (km s-1) | c2 (km s-1) | χ 2 | BIC |
|
|
|||||||||
| SB | 1.90 ± 0.05 | 90† | 0† | –143.0 |
0† | 0† | 0† | 68.4 | 75.9 |
|
|
|||||||||
| SB + CV | 1.90 ± 0.05 | 90† | 0† | –143.2 |
–0.16 |
0.22 |
0† | 67.0 | 78.3 |
|
|
|||||||||
| SB + CV | 2.02 ± 0.09 | 90† | 0† | –139.8 |
–1.06 |
3.68 |
–2.81 ± 1.51 | 63.3 | 78.3 |
|
|
|||||||||
| DR | 2.5 |
124 |
0.3 ± 0.5 | –142.6 ± 1.9 | 0† | 0† | 0† | 67.7 | 82.7 |
| [1.8, 3.1] | [101, 158] | [0.1, 1.0] | [–144.5, –140.8] | ||||||
Notes. In all scenarios, we report the median of the posterior distributions as the best estimate for the model parameters, along with its associated 68.3% confidence interval. The (†) symbol indicates fixed parameters. In the solid-body (SB) scenarios, the value in the veq column corresponds to veqsini⋆. When CV are accounted for, c0 is degenerate and must be derived from the posterior distribution of c1 and c2. It is thus not possible to fit a constant CV model, and in that case c0 is set to 0 km s-1. In the differential-rotation (DR) scenario, some posterior distributions are asymmetric and we also provide the 68.3% HDI (see text).
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