TOI-3493 b: A planet with a Neptune-like density transiting a bright G0-type star

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Table A.1

Priors used for TOI-3493 b in the joint fit with juliet.

Parameter^a	Prior	Unit	Description
Stellar and planetary parameters
ρ_⋆	$U$ $\mathcal{U}$ (100, 10000)	g cm⁻³	Stellar density
P	$N$ $\mathcal{N}$ (8.159, 0.002)	d	Period of planet b
t₀	$N$ $\mathcal{N}$ (2459313.0471, 0.002)	d	Time of transit center of planet b
r₁	$U$ $\mathcal{U}$ (0, 1)	…	Parameterization for p and b
r₂	$U$ $\mathcal{U}$ (0, 1)	…	Parameterization for p and b
K	$U$ $\mathcal{U}$ (0, 20)	m s⁻¹	RV semi-amplitude of planet b
e	0.0 (fixed)	…	Orbital eccentricity of planet b
ω	90.0 (fixed)	deg	Periastron angle of planet b
Photometry parameters
D_{TESS 37, 64}	1.0 (fixed)	…	Dilution factor for TESSsectors 37, 64
M_{TESS 37,64}	$N$ $\mathcal{N}$ (0, 0.1)	…	Relative flux offset for TESSsectors 37, 64
σ_{TESS 37,64}	$L U$ $\mathcal{L}\mathcal{U}$ (10⁻³, 10⁴)	ppm	Extra jitter term for sectors TESS 37, 64
q_{1,TESS 37,64}	$U$ $\mathcal{U}$ (0, 1)	…	Limb-darkening parameterization for TESSsectors 37, 64
q_{2,TESS 37,64}	$U$ $\mathcal{U}$ (0, 1)	…	Limb-darkening parameterization for TESSsectors 37, 64
RV parameters
μ_HARPS	$N$ $\mathcal{N}$ (−10, 10)	m s⁻¹	RV zero point for HARPS
σ_HARPS	$L U$ $\mathcal{L}\mathcal{U}$ (0.01, 10)	m s⁻¹	Extra jitter term for HARPS
$\dot{γ}$ $\dot{\gamma}$	$U$ $\mathcal{U}$ (−100, 100)	m s⁻¹ day⁻¹	Linear trend/Radial acceleration
GP hyperparameters
σ_GP,RV	$U$ $\mathcal{U}$ (0, 100)	m s⁻¹	Amplitude of GP component for the RVs
α_GP,RV	$L U (10^{- 10}, 10^{- 6})$ $\mathcal{L}\mathcal{U}(10^{-10}, 10^{-6})$	d⁻²	Inverse length-scale of GP exponential component for the RVs
Γ_GP,RV	$L U$ $\mathcal{L}\mathcal{U}$ (0.1, 10)	…	Amplitude of GP sine-squared component for the RVs
P_rot;GP,RV	$U$ $\mathcal{U}$ (10, 60)	d	Period of the GP QP component for the RVs

Notes. ^(a) $N (μ, σ^{2})$ $\mathcal{N}(\mu, \sigma^2)$ is a normal distribution of mean μ and variance σ², $U$ $\mathcal{U}$ (a, b) and $L U$ $\mathcal{L}\mathcal{U}$ (a, b) are uniform and log-uniform distributions between a and b.

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