Formation of Phobos and Deimos via a giant impact

摘要: Abstract Although the two moons of Mars, Phobos and Deimos, have long been thought to be captured asteroids, recent observations their compositions orbits suggest that they may formed from debris generated by one or more giant impacts bodies with ∼0.01× target mass. Recent studies both analytically estimated produced on Mars numerically examined evolution circum-Mars disks. We perform a numerical study (Smoothed Particle Hydrodynamics simulation) retention onto particularly in relation Borealis-scale impact ( E ∼ 3 × 10 29  J) capable producing Borealis basin. find is disk mass 5 20  kg (∼1–4% impactor mass), sufficient form at least martian according evolution. While generate further are necessary. Our results can serve as inputs for future