Table 2
Model parameters used in the transit analysis when comparing different noise models.
Parameter | Symbol | Prior | Correct value (a) | Units |
---|---|---|---|---|
Planet parameters | ||||
Orbital period | P | ℱ (365.25) | 365.25 | days |
Transit time | T0 | 𝓤(0.48,0.52) | 0.4995–0.5005 (b) | days |
Planet-to-star radius ratio | Rp/R⋆ | 𝓤(0.0,0.02) | 0.009168 | - |
Scaled semi-major axis | (R⋆ + Rp)/a | 𝓤(0.0,0.02) | 0.004693 | – |
Cosine of inclination | cos(i) | 𝓤(0.0,0.006) | varying | – |
White noise term | σW | 𝓤(45,6738) | varying | ppm |
Stellar parameters | ||||
Stellar mass | M⋆ | ℱ (1.0) | 1.0 | M⊙ |
Stellar radius | R⋆ | ℱ (1.0) | 1.0 | R⊙ |
Limb-darkening coefficients | q1 | 𝒩 (0.392, 0.0085) | – | – |
q2 | 𝒩 (0.322, 0.0117) | – | – | |
Matérn-3/2 GP | ||||
Amplitude | ln(σ) | 𝓤(−20, −1) | – | – |
Length scale parameter | ln(ρ) | 𝓤(−15, 5) | – | – |
SHO GP | ||||
Scaled amplitude | ln(S0) | 𝒩(−26.79, 0.04) | – | – |
Quality factor | ln(Q) | 𝒩 (−0.402, 0.025) | – | – |
Angular Frequency | ln(ω0) | 𝒩(6.932, 0.011) | – | – |
Notes. The Gaussian priors with meanµ and standard deviation σ are displayed as 𝒩(µ, σ). 𝓤(Ul, Uu) represents an uniform prior with Ul and Uu as lower and upper limits respectively. ℱ describes a fixed value. (a)Value of the injected transit signal. (b)The injected transit mid-time is always the exact middle of the dataset, which varies accross the different observations according to the exact observation times of the HMI images.
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