000006491 001__ 6491
000006491 005__ 20230905122708.0
000006491 0247_ $$2DOI$$a10.1038/s41586-023-06150-0
000006491 037__ $$aSCART-2023-0156
000006491 100__ $$aLe Maistre, Sébastien
000006491 245__ $$aSpin state and deep interior structure of Mars from InSight radio tracking
000006491 260__ $$c2023
000006491 520__ $$aKnowledge of the interior structure and atmosphere of Mars is essential to understanding how the planet has formed and evolved. A major obstacle to investigations of planetary interiors, however, is that they are not directly accessible. Most of the geophysical data provide global information that cannot be separated into contributions from the core, the mantle and the crust. The NASA InSight mission changed this situation by providing high-quality seismic and lander radio science data1,2. Here we use the InSight's radio science data to determine fundamental properties of the core, mantle and atmosphere of Mars. By precisely measuring the rotation of the planet, we detected a resonance with a normal mode that allowed us to characterize the core and mantle separately. For an entirely solid mantle, we found that the liquid core has a radius of 1,835 $\pm$55 km and a mean density of 5,955--6,290 kg m−3, and that the increase in density at the core--mantle boundary is 1,690--2,110 kg m−3. Our analysis of InSight's radio tracking data argues against the existence of a solid inner core and reveals the shape of the core, indicating that there are internal mass anomalies deep within the mantle. We also find evidence of a slow acceleration in the Martian rotation rate, which could be the result of a long-term trend either in the internal dynamics of Mars or in its atmosphere and ice caps.
000006491 594__ $$aNO
000006491 700__ $$aRivoldini, Attilio
000006491 700__ $$aCaldiero, Alfonso
000006491 700__ $$aYseboodt, Marie
000006491 700__ $$aBaland, Rose-Marie
000006491 700__ $$aBeuthe, Mikael
000006491 700__ $$aVan Hoolst, Tim
000006491 700__ $$aDehant, Véronique
000006491 700__ $$aFolkner, William M.
000006491 700__ $$aBuccino, Dustin
000006491 700__ $$aKahan, Daniel
000006491 700__ $$aMarty, Jean-Charles
000006491 700__ $$aAntonangeli, Daniele
000006491 700__ $$aBadro, James
000006491 700__ $$aDrilleau, Mélanie
000006491 700__ $$aKonopliv, Alex
000006491 700__ $$aPéters, Marie-Julie
000006491 700__ $$aPlesa, Ana-Catalina
000006491 700__ $$aSamuel, Henri
000006491 700__ $$aTosi, Nicola
000006491 700__ $$aWieczorek, Mark
000006491 700__ $$aLognonné, Philippe
000006491 700__ $$aPanning, Mark
000006491 700__ $$aSmrekar, Suzanne
000006491 700__ $$aBanerdt, W. Bruce
000006491 773__ $$c733–737$$pNature$$v619$$y2023
000006491 8560_ $$fattilio.rivoldini@ksb-orb.be
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000006491 905__ $$apublished in
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