Origin of Phobos and Deimos by the impact of a Vesta-to-Ceres sized body with Mars
| Autor: | Julien Salmon, Robin M. Canup |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Multidisciplinary
010504 meteorology & atmospheric sciences Astronomy SciAdv r-articles Mars Exploration Program 01 natural sciences Astrobiology Moons of Mars Smoothed-particle hydrodynamics Planet Physics::Space Physics 0103 physical sciences Astrophysics::Earth and Planetary Astrophysics Ejecta 010303 astronomy & astrophysics Event (particle physics) Space Sciences Astrophysics::Galaxy Astrophysics Geology Research Articles 0105 earth and related environmental sciences Research Article |
| Zdroj: | Science Advances |
| ISSN: | 2375-2548 |
| Popis: | Phobos and Deimos are likely remnants of a low-mass disk generated by the impact of a Vesta to Ceres-sized body with Mars. It has been proposed that Mars’ moons formed from a disk produced by a large impact with the planet. However, whether such an event could produce tiny Phobos and Deimos remains unclear. Using a hybrid N-body model of moon accumulation that includes a full treatment of moon-moon dynamical interactions, we first identify new constraints on the disk properties needed to produce Phobos and Deimos. We then simulate the impact formation of disks using smoothed particle hydrodynamics, including a novel approach that resolves the impact ejecta with order-of-magnitude finer mass resolution than existing methods. We find that forming Phobos-Deimos requires an oblique impact by a Vesta-to-Ceres sized object with ~10−3 times Mars’ mass, a much less massive impactor than previously considered. |
| Databáze: | OpenAIRE |
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