A lighter core for Phobos?

نویسندگان

چکیده

Context. The origin of the Martian moons Phobos and Deimos is still poorly understood, focus intense debate. Aims. We demonstrate that a stratified internal structure compatible with observed gravity coefficients. Methods. fit previously derived C 20 22 coefficients from combined MEX Doppler-tracking data close flybys in +2010 2013 respect to corresponding core–mantle stratification model Phobos, two opposite cases: core denser than mantle, lighter mantle. Results. Only case mantle fits at 3 σ level reported second degree order coefficient , but homogeneous cannot be strictly ruled out level. Conclusions. This possible loosening density might result displacement material toward surface, may caused by centrifugal forces acting on loosely packed rubble-pile structure, and/or hot-then-cold in-orbit accretion process. These hypotheses are no means exhaustive.

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ژورنال

عنوان ژورنال: Astronomy and Astrophysics

سال: 2021

ISSN: ['0004-6361', '1432-0746']

DOI: https://doi.org/10.1051/0004-6361/202038844