000005562 001__ 5562
000005562 005__ 20220120115209.0
000005562 037__ $$aCTALK-2022-0010
000005562 100__ $$aRivoldini, A.
000005562 245__ $$aEffect of the core structure on the nutation of Mars
000005562 260__ $$c2021
000005562 269__ $$c2021-06-03
000005562 520__ $$aNutations are periodic changes in the orientation of the planet mainly due to the gravitational interaction with the Sun. The amplitude of the nutations dependents on a well known forcing and on the interior structure of Mars and in particular on the liquid core. One of the prime objectives of the RISE experiment on the ongoing InSight mission is to measure precisely the nutations of Mars and from the data infer the radius of its core and constrain its chemical composition.  Sulfur is commonly considered to be the main light element in the core of Mars, but the amount required to match the core density inferred from geodesy data is in excess of 25wt%. This is significantly larger than what is expected from geochemical modeling. Another candidate light element that can dissolve appreciably in liquid iron-sulfur at Mars core conditions is oxygen. In this study, we build a new thermodynamic model of liquid iron-oxygen-sulfur to describe the thermoelastic properties of the core and investigate how the thermal structure of the core and its thermoelastic properties affect nutations.
000005562 594__ $$aNO
000005562 6531_ $$aMars, nutation, RISE, core, rotation
000005562 700__ $$aMorard, G.
000005562 700__ $$aAntonageli, D.
000005562 700__ $$aVan Hoolst, T.
000005562 700__ $$aLe Maistre, S.
000005562 700__ $$aDehant, V.
000005562 773__ $$tJpGU Meeting 2021, Okayama, online
000005562 8560_ $$fattilio.rivoldini@observatoire.be
000005562 8564_ $$s1820073$$uhttps://publi2-as.oma.be/record/5562/files/JPGU.pdf
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000005562 906__ $$aInvited
000005562 980__ $$aCTALKINVI