TOI-2015 b: A sub-Neptune in strong gravitational interaction with an outer non-transiting planet

Open Access

Table G.1

PyTTV model parameters and priors.



Description	Units	Prior
Stellar parameters

Stellar mass	[M_⊙]	𝒩(0.33, 0.02)
Stellar radius	[R_⊙]	𝒩(0.339, 0.016)
Limb darkening $q_{1}^{a}$ $\[q_{1}^{a}\]$	[-]	𝒰(0, 1)
Limb darkening $q_{2}^{a}$ $\[q_{2}^{a}]$	[-]	𝒰(0, 1)
Planet b parameters

log₁₀ mass	[log₁₀ M_⊙]	𝒩(−4.8, 0.1)^b
Radius ratio	[R_⋆]	𝒩(0.1, 0.01)
Transit centre	[BJD_TDB]	𝒩(2459712.930, 0.005)
Orbital period	[d]	𝒩(3.35, 0.01)
Impact parameter	[R_⋆]	𝒰(0.5, 1.0)
$\sqrt{e} \cos ω$ $\[\sqrt{e} \cos \omega\]$	[-]	𝒰(−0.25, 0.25)
$\sqrt{e} \sin ω$ $\[\sqrt{e} \sin \omega\]$	[-]	𝒰(−0.25, 0.25)
Ω	[rad]	𝒩(π, 0.0001)
Planet c parameters

log₁₀ mass	[log₁₀ M_⊙]	𝒰(−4.4, 0.1)^b
Radius ratio	[R_⋆]	𝒩(0.1, 0.01)
Mean anomaly at T_ref	[rad]	𝒰(0, 2 π)
Orbital period	[d]	Depends on the scenario
Impact parameter	[R_⋆]	𝒩(0.0, 3.0)
$\sqrt{e} \cos ω$ $\[\sqrt{e} \cos \omega\]$	[-]	𝒰(−0.25, 0.25)
$\sqrt{e} \sin ω$ $\[\sqrt{e} \sin \omega\]$	[-]	𝒰(−0.25, 0.25)
Ω	[rad]	𝒩(π, 0.0001)
RV parameters

Linear trend	[m/s/d]	𝒩(0, 1.0)
Systemic velocity 1	[m/s]	𝒩(−25855, 200)
Systemic velocity 2	[m/s]	𝒩(−25416, 200)
log₁₀ jitter 1	[log₁₀ m/s]	𝒩(−1, 0.1)
log₁₀ jitter 2	[log₁₀ m/s]	𝒩(−1, 0.1)

Notes. All the planetary parameters except the radius ratio and log₁₀ mass are defined at a reference time, t_ref = 2459424.785.

^(a) We use the triangular parameterization for quadratic limb darkening introduced by Kipping (2013). ^(b)The log₁₀ planet mass priors are loosely based on two-planet RV analysis.

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