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We present the first investigation of Th abundances in Solar twins andanalogues to understand the possible range of this radioactive element and itseffect on rocky planet interior dynamics and potential habitability. Theabundances of the radioactive elements Th and U are key components of aplanet's energy budget, making up 30% to 50% of the Earth's (Korenaga 2008;All\`egre et al. 2001; Schubert et al. 1980; Lyubetskaya & Korenaga 2007; TheKamLAND Collaboration 2011; Huang et al. 2013). Radiogenic heat drives interiormantle convection and surface plate tectonics, which sustains a deep carbon andwater cycle and thereby aides in creating Earth's habitable surface. Unlikeother heat sources that are dependent on the planet's specific formationhistory, the radiogenic heat budget is directly related to the mantleconcentration of these nuclides. As a refractory element, the stellar abundanceof Th is faithfully reflected in the terrestrial planet's concentration. Wefind that log eps Th varies from 59% to 251% that of Solar, suggestingextrasolar planetary systems may possess a greater energy budget with which tosupport surface to interior dynamics and thus increase their likelihood to behabitable compared to our Solar System.

Thorium Abundances in Solar Twins and Analogues: Implications for the Habitability of Extrasolar Planetary Systems