Times are in Barycentric Julian Date calculated directly from UTC without correction for leap seconds. T_c: reference epoch of mid transit that minimizes the correlation with the orbital period. T₁₄: total transit duration, time between first to last contact; T₁₂ = T₃₄: ingress/egress time, time between first and second, or third and fourth contact.

Reciprocal of the half duration of the transit used as a jump parameter in our MCMC analysis in place of a/R_⋆. It is related to a/R_⋆ by the expression (Bakos et al. 2010).

The factor by which the HS transit depths are scaled in the global light curve and RV modelling to account for blending with neighbouring stars and over-correction by the trend-filtering method.

Values for a quadratic law, adopted from the tabulations by Claret (2004) according to the spectroscopic (ZASPE) parameters listed in Table 3.

As discussed in Sect. 3.3 the adopted parameters for all four systems are determined assuming circular orbits. We also list the 95% confidence upper limit on the eccentricity determined when and are allowed to vary in the fit.

Term added in quadrature to the formal RV uncertainties for each instrument. This is treated as a free parameter in the fitting routine.

Correlation coefficient between the planetary mass M_p and radius R_p estimated from the posterior parameter distribution.

The Safronov number is given by (see Hansen & Barman 2007).

Incoming flux per unit surface area, averaged over the orbit.