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Table 3

Comparison of measured and inferred properties of the WASP-18 and WASP-103 UHJ systems.

System parameters

System WASP-18 WASP-103
Planet mass MJ 10.43 ± 0.54 1.49 ± 0.09
Planet radius RJ 1.17 ± 0.07 1.55 ± 0.05
Planet Teq 2413 ± 44 K 2508 ± 73 K
Orbital period 22.6 h 22.2 h
Stellar Teff 6400 ± 100 K 6110 ± 160 K

Inferred properties

Day-night contrast >0.96 0.93
Brightness offset 4.5° ± 0.5 −0.3° ± 0.1
Planet metallicity − 0.01 ± 0.35 1.36 ± 0.36
Dayside photosphere 0.33 bar 0.01 bar
Radius anomaly 0% 41%

Notes.System parameters are taken from Hellier et al. (2009); Southworth et al. (2009, 2015). Values in bold are from this work. Other inferred properties are taken from Arcangeli et al. (2018) and Kreidberg et al. (2018). Photospheric pressures are the median contributing pressures of the dayside spectra over the HST/WFC3 G141 bandpass. The radius anomaly shown is the difference inradius between the measured value and the non-inflated model as a percentage of the measured radius taken from Thorngren & Fortney (2018).

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