Mass–radius and mass–density diagrams for known transiting exoplanets. The positions of WASP-60 b are shown in the both panels with a green point in a box (this work) and a red point in a circle (Hébrard et al. 2013). The error bars are also illustrated. The grey points denote values taken from TEPCat and their error bars are suppressed for clarity. Top panel: a zoom of the mass–radius diagram of known transiting exoplanets. Dashed lines show where density is 2.5, 1.0, 0.5, 0.25, and 0.1 ρ_Jup. Bottom panel: mass–density diagram of known transiting exoplanets. Dashed lines refer to four planetary models with various core masses and another one without a core (Fortney et al. 2007).