The Habitable Zone Composition (HZC) measures how compatible forlife is the bulk composition of an exoplanet within the habitablezone. Life requires a variety of elements from volatiles to iron.Habitable planets require a mixture of these readily available.Iron planets will have less water and rock, and water or gasplanets less iron and rock. Gas planets are unsuitable for life asany small rocky core gets isolated from the gas phase by highpressure water or liquid H layers. Therefore, only exoplanets witha composition between pure iron and pure water (i.e. rocky) arepotentially habitable. Potential carbon planets also fall betweenthese conditions.
We used mass-radius relationships
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