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The close proximity of short period hot-Jupiters to their parent star meansthey are subject to extreme tidal forces. This has a profound effect on theirstructure and, as a result, density measurements that assume that the planet isspherical can be incorrect. We have simulated the tidally distorted surface for34 known short period hot-Jupiters, assuming surfaces of constant gravitationalequipotential for the planet, and the resulting densities have been calculatedbased only on observed parameters of the exoplanet systems. Comparing theseresults to the density values assuming the planets are spherical shows thatthere is an appreciable change in the measured density for planets with veryshort periods (typically less than two days). For one of the shortest-periodsystems, WASP-19b, we determine a decrease in bulk density of 12% from thespherical case and, for the majority of systems in this study, this value is inthe range of 1-5%. On the other-hand, we also find cases where the distortionis negligible (relative to the measurement errors on the planetary parameters)even in the cases of some very short period systems, depending on the massratio and planetary radius. For high-density gas-planets requiring apparentlyanomalously large core masses, density corrections due to tidal deformationcould become important for the shortest-period systems.

Tidally Distorted Exoplanets: Density Corrections for Short-Period Hot-Jupiters based solely on Observable Parameters