8181 20260914120155.0 POSTER-2026-0087 Rivoldini, Attilio Mercury’s interior structure constrained from its thermal state and geodesy data 2026 2026-09-14 Interior structure inferences for Mercury based on geodetic data can be strongly affected by prior assumptions about the detailed thermal structure of the core. In particular, the presence of a conductive, thermally stratified layer in the upper core (CTSL) is often neglected, although it directly affects the core temperature profile and, consequently, inferences about core composition and inner-core radius. The upper CTSL is a key component of numerical dynamo simulations that can explain important features of Mercury’s magnetic field. Additional support for a CTSL also comes from thermal evolution studies that use constraints on dynamo activity in the core. In this study, we assess how assumptions about core composition, the present-day thermal state, and the CTSL affect Mercury’s annual libration amplitude, long-period libration, obliquity, and tidal Love numbers. To determine the present-day thermal state, we use results from whole-planet thermal evolution simulations that are consistent with assumptions about core composition and constrained by crustal thickness, radial contraction, and past and present dynamo activity. 3PRODPLANINT/ 3PRODPLANINT/ 3PRODPLANINT NO Tosi, Nicola Lécaille, Manon Van Hoolst, Tim Trinh, Anthony Baland, Rose-Marie Yseboodt, Marie Xiao, Haifeng Unravelling the magnetic histories of Earth and other terrestrial objects, London, UK attilio.rivoldini@ksb-orb.be 5507218 http://publi2-as.oma.be/record/8181/files/Rivoldini poster London.pdf 22241 http://publi2-as.oma.be/record/8181/files/Rivoldini poster London.gif?subformat=icon icon 24816 http://publi2-as.oma.be/record/8181/files/Rivoldini poster London.jpg?subformat=icon-180 icon-180 CPOSTER