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We report the discovery of two transiting planetary systems: a super dense,sub-Jupiter mass planet WASP-86b (\mpl\ = 0.82 $\pm$ 0.06 \mj, \rpl\ = 0.63$\pm$ 0.01 \rj), and a bloated, Saturn-like planet WASP-102b (\mpl\ = 0.62$\pm$ 0.04 \mj, \rpl\=1.27 $\pm$ 0.03 \rj). They orbit their host star every$\sim$5.03, and $\sim$2.71 days, respectively. The planet hosting WASP-86 is aF7 star (\teff\ = 6330$\pm$110 K, \feh\ = $+$0.23 $\pm$ 0.14 dex, and age$\sim$0.8--1~Gyr), WASP-102 is a G0 star (\teff\ = 5940$\pm$140 K, \feh\ =$-$0.09$\pm$ 0.19 dex, and age $\sim$1~Gyr). These two systems highlight thediversity of planetary radii over similar masses for giant planets with massesbetween Saturn and Jupiter. WASP-102b shows a larger than model-predictedradius, indicating that the planet is receiving a strong incident flux whichcontributes to the inflation of its radius. On the other hand, with a densityof $\rho_{pl}$ = 3.24$\pm$~0.3~$\rho_{jup}$, WASP-86b is the densest gas giantplanet among planets with masses in the range 0.05 $<M$_{pl}$<$ 2.0 \mj. With astellar mass of 1.34 M$_{\odot}$ and \feh = $+$0.23 dex, WASP-86 could hostadditional massive and dense planets given that its protoplanetary disc isexpected to also have been enriched with heavy elements. In order to matchWASP-86b's density, an extrapolation of theoretical models predicts a planetcomposition of more than 80\% in heavy elements (whether confined in a core ormixed in the envelope). This fraction corresponds to a core mass ofapproximately 210\me\ for WASP-86b's mass of \mpl$\sim$260\,\me. Only planetswith masses larger than about 2\mj\ have larger densities than that ofWASP-86b, making it exceptional in its mass range.

WASP-86b and WASP-102b: super-dense versus bloated planets