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Lava worlds are a potential emerging population of Super-Earths that are onclose-in orbits around their host stars with likely partially molten mantles.To date, few studies address the impact of magma on the observed properties ofa planet. At ambient conditions magma is less dense than solid rock; however,it is also more compressible with increasing pressure. Therefore, it is unclearhow large-scale magma oceans affect planet observables, such as bulk density.We update ExoPlex, a thermodynamically self-consistent planet interiorsoftware, to include anhydrous, hydrous (2.2 wt \% H_2O), and carbonated magmas(5.2 wt\% CO_2). We find that Earth-like planets with magma oceans larger than\sim 1.5 R_{\oplus} and \sim 3.2 M_{\oplus} are modestly denser than anequivalent mass solid planet. From our model, three classes of mantlestructures emerge for magma ocean planets: (1) mantle magma ocean, (2) surfacemagma ocean, and (3) one consisting of a surface magma ocean, solid rock layer,and a basal magma ocean. The class of planets in which a basal magma ocean ispresent may sequester dissolved volatiles on billion-year timescales, in whicha 4 M_{\oplus} mass planet can trap more than 130 times the mass of water thanin Earth's present-day oceans and 1000 times the carbon in the Earth's surfaceand crust.

Fizzy Super-Earths: Impacts of Magma Composition on the Bulk Density and Structure of Lava Worlds