Table 1
Properties for the WASP-121 system.
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Stellar properties | |||
| Mass | M⋆ | 1.358 |
M⊙ |
| Radius | R⋆ | 1.458 ± 0.030 | R⊙ |
| Density(†) | ρ⋆ | 0.434 ± 0.038 | ρ⊙ |
| Limb-darkening coefficients | u1 | 0.268 ± 0.039 | |
| u2 | 0.138 |
||
| Planetary properties | |||
| Transit epoch | T0 | 2 458 119.72074 ± 0.00017 | BJDTDB |
| Orbital period | P | 1.27492485 ± 5.6 × 10−7 | d |
| Scaled semi-major axis | ap∕R⋆ | 3.8216 |
|
| Semi-major axis(†) | ap | 0.02591 ± 0.00054 | au |
| Eccentricity | e | [0–0.0032] | |
| Argument of periastron | ω | 10 ± 10 | deg |
| Orbital inclination | ip | 89.10 |
deg |
| Impact parameter(†) | b | 0.060 |
|
| Transit durations(†) | T14 | 2.9059 |
h |
| T23 | 2.2639 ± 0.0051 | h | |
| Planet-to-star radii ratio | Rp∕R⋆ | 0.12355 |
|
| Radius(†) | Rp | 1.753 ± 0.036 | RJup |
| Planet-to-star flux ratios |  |
419 |
ppm |
 |
[0–65] | ppm | |
| Dayside temperature |  |
2870 ± 50 | K |
| Nightside temperature |  |
[0 - 2200] | K |
| Radiative-to-advective timescale ratio | ξ | −0.016 |
|
Notes. The mass, radius, and density of the star come from Delrez et al. (2016). All other properties come from the present work. Values in brackets indicate the 1σ confidence intervals for the eccentricity, nightside planetary flux, and temperature whose lower limits are consistent with 0. The 3σ upper limits for these parameters are 0.078, 168, and 2500 K, respectively. Coefficients u1 and u2 are associated with a quadratic limb-darkening law. (†)Derived parameters. The planet brightness temperatures are derived directly from the planet-to-star flux ratios measured in the TESS band.
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