Table 1
Summary of the RV model parameter priors used for all models throughout this study.
| Parameter | Prior |
|---|---|
| Systemic velocity, γ (m s−1) |  |
| GP hyperparameters | |
| Covariance amplitude, | |
| ln(a∕(m s−1)) |  |
| Exponential timescale, | |
| ln(λ∕days) | p(lnλ|K2 photometry) |
| Coherence, ln(Γ) | p(lnΓ|K2 photometry) |
| Periodic timescale, | |
| ln(PGP∕days) | p(lnPGP|K2 photometry) |
| Additive jitter, s (m s−1) |  |
| Keplerian parameters | |
| Pb (days) |  |
| T0,b [BJD-2 450 000] |  |
| Kb (m s−1) |  |
 |
 |
 |
 |
| Pc (days) |  |
| T0,c [BJD-2 450 000] |  |
| Kc (m s−1) |  |
 |
 |
 |
 |
Notes. (a) Based on the transit light curve measurements from Benneke et al. (2017). 
m s−1 refers to a modified Jeffreys prior on a parameter A, which behaves like a uniform prior for A ≪ the knee at K m s−1 and like a Jeffreys prior at A ≫ k up to l. We use a modified Jeffreys prior on the RV semi-amplitudes K to sample multiple decades as a Jeffreys prior but also include K = 0 m s−1 which a Jeffreys prior does not (Gregory 2005). (c)We further insist that e = h2 + k2 < 1.
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