Poster
A. Castro-González, O. Demangeon, J. Lillo-Box
Abstract
Small planets located at the lower mode of the bimodal radius distribution are assumed to be composed of iron and silicates in a proportion similar to that of the Earth. However, recent discoveries are revealing a new group of low-density planets that are inconsistent with that description. Their low densities could be explained by a scarcity of iron within their cores, by the presence of a significant amount of volatile elements, or by both effects. Recently, it was found that stars with higher Mg/Fe and Si/Fe ratios host lighter super-Earths. However, the lowest-dense super-Earths require volatile elements, and the reason why they preserved them is unknown. In this talk, I will present our characterization of the unusually low-density super-Earth TOI-244b and discuss its composition. Besides, I will present two new trends in the density-metallicity and density-insolation parameter space that might hint at the formation and composition of the lowest-density super-Earths.
Exoplanets5
Leiden, Netherlands
2024 June
