Table 5
Priors and best-fitting values for the transit, occultation, and phase curve model parameters described in Sect. 4, along with a selection of derived parameters.
| Parameter | Unit | Prior | Best fit | |
|---|---|---|---|---|
| Transit, occultation and phase-curve model parameters | ||||
| Period | P | d |  (2.1487, 2.1488) |
 |
| Time of inferior conjunction | t0 | BJDTDB − 2458833 |  (0.487, 0.489) |
 |
| Transit depth | δtrans | % |  (0.5, 0.7) |
 |
| Stellar density | ρ⋆ | g cm−3 |  (0.2, 0.4) |
 |
| Impact parameter | b |  (0.0, 1.0) |
0.113 ± 0.012 | |
| Cosine eccentric component |  |
 (-0.15, 0.15) |
0.001 ± 0.015 | |
| Sine eccentric component |  |
 (-0.15, 0.15) |
 |
|
| CHEOPS quadratic limb darkening | q1,C |  (0.0, 1.0) |
 |
|
| CHEOPS quadratic limb darkening | q2,C |  (0.0, 1.0) |
 |
|
| Spitzer quadratic limb darkening | q1,S |  (0.0, 1.0) |
 |
|
| Spitzer quadratic limb darkening | q2,S |  (0.0, 1.0) |
 |
|
| Stellar radius | R⋆ | R⊙ |  (2.072, 0.022) |
 |
| Stellar inclination | i⋆ | deg |  (0, 90) |
 |
| Sky-projected spin orbit angle | λ | deg |  (69.5, 3.0) |
 |
| Projected stellar rotational velocity | vsini⋆ | km s−1 |  (109.0, 4.0) |
 |
| Gravity darkening coefficient | β | fixed | 0.199 | |
| Stellar effective/polar temperature (a) | Teff∕pole | K | fixed | 7490 |
| Hotspot offset | Δϕ | deg |  (-180, 180) |
 |
| Cmℓ power coefficient | lnC1,1 |  (-2.75, 1.25) |
 |
|
| Mean background temperature |  |
K |  (1000, 4000) |
 |
| Fluid number | α | fixed | 0.6 | |
| Drag frequency | ωdrag | fixed | 4.5 | |
| Single-scattering albedo | ωscat |  (0.0, 1.0) |
 |
|
| Scattering asymmetry factor | g |  (0.0, 0.07) |
 |
|
| Derived parameters | ||||
| Stellar density | ρ⋆ | ρ⊙ |  |
|
| Stellar mass | M⋆ | M⊙ |  |
|
| Transit duration | t14 | hr |  |
|
| Radius ratio | Rp ∕R⋆ |  |
||
| Semi major axis | a | R⋆ |  |
|
| Semi major axis | a | au |  |
|
| Orbital inclination | ip | deg | 88.45 ± 0.17 | |
| Eccentricity | e |  |
||
| Argument of periastron | ωperi | deg |  |
|
| Planetary radius | Rp | RJ |  |
|
| Planetary equilibrium temperature | Tequil | K |  |
|
| Stellar rotational period | Prot | d |  |
|
| Oblateness | fobl | 0.0439 ± 0.0018 | ||
| Stellar polar gravity | gpole | m s−2 |  |
|
| Spin-orbit angle | Ψ | deg |  |
|
| CHEOPS occultation depth | δocc,C | ppm |  |
|
| Spitzer occultation depth | δocc,S | ppm |  |
|
| Integrated dayside temperature | Td | K |  |
|
| CHEOPS nightside flux | Fnight,C | ppm |  |
|
| Spitzer nightside flux | Fnight,S | ppm |  |
|
| Integrated nightside temperature | Tn | K | 1720 ± 330 | |
| CHEOPS phase curve amplitude | Famp,C | ppm | 131 ± 19 | |
| Spitzer phase curve amplitude | Famp,S | ppm |  |
|
| Geometric albedo | Ag |  |
||
| Phase integral | q |  |
||
| Spherical albedo | As |  |
||
Notes. The baseline and noise parameters in the model are displayed in Table A.1. (a)One parameter is used for both the Teff (used in the phase-curve model) and Tpole (used in the asymmetric transit model).
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