000005875 001__ 5875
000005875 005__ 20221028113132.0
000005875 0247_ $$2DOI$$a10.1029/2022JE007291
000005875 037__ $$aSCART-2022-0107
000005875 100__ $$aPou, L. 
000005875 245__ $$aTidal Constraints on the Martian Interior
000005875 260__ $$c2022
000005875 520__ $$aWe compare several recent Martian interior models and evaluate how these are impacted by the tidal constraints provided by the Love number k2 and the secular acceleration in longitude s of its main moon, Phobos. The expression of the latter is developed up to harmonic degree 5 to match the accuracy of the current observations. We match a number of current interior structure models to the recent measurements of the tidal parameters and derive estimations of the possible core radius, temperature profile, and attenuation in the Martian interior. Our estimation of the core radius is 1,820 $\pm$ 80 km, consistent with recent seismic measurements. The attenuation profiles in the Martian interior at the main tidal period of Phobos are similar between the considered models, giving a range for the degree-2 bulk tidal attenuation Q2 = 93.0 $\pm$ 8.40 but diverge at seismic frequencies. At seismic frequencies, model shear attenuation Qμ ranges between 100 and 4,000 in the lower mantle, so that a measurement of seismic shear attenuation could be used as an effective means for distinguishing between the models considered. Other constraints such as elastic lithosphere thickness and Chandler Wobble period favor a thicker elastic lithosphere and models with a frequency dependence α of the shear attenuation between 0.15 and 0.4. Improved constraints on the Martian interior should be possible with additional seismic and radio observations from the InSight mission.
000005875 536__ $$a3PRODPLANINT/$$c3PRODPLANINT/$$f3PRODPLANINT
000005875 594__ $$aNO
000005875 700__ $$aNimmo, F. 
000005875 700__ $$aRivoldini, A. 
000005875 700__ $$aKhan, A. 
000005875 700__ $$aBagheri, A. 
000005875 700__ $$aGray, T. 
000005875 700__ $$aSamuel, H. 
000005875 700__ $$aLognonné, P. 
000005875 700__ $$aPlesa, A.-C. 
000005875 700__ $$aGudkova, T. 
000005875 700__ $$aGiardini, D.
000005875 773__ $$n11$$pJournal of Geophysical Research: Planets$$v127$$y2022
000005875 8560_ $$fattilio.rivoldini@observatoire.be
000005875 8564_ $$s1425083$$uhttp://publi2-as.oma.be/record/5875/files/Pou2022aa00.pdf
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000005875 8564_ $$s23185$$uhttp://publi2-as.oma.be/record/5875/files/Pou2022aa00.jpg?subformat=icon-180$$xicon-180
000005875 905__ $$apublished in
000005875 980__ $$aREFERD