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Status: Unchecked ×Keyword: radial dispersion ×Clear all

3 claims from 1 paper

1. Physics and Astronomy › Astro and Planetary Science

   Terrestrial planet formation from a ring

   Woo, Morbidelli, Grimm, Stadel and Brasser · Icarus · 2023

   N-body simulations of a ring of planetesimals at ~1 AU test whether a ring can reproduce the terrestrial planets, and find that the gas disc's shape strongly affects whether mass stays concentrated.

   Unchecked3 claims
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   1. UncheckedIn simulations, planetesimals starting in a ring at ~1 AU in a minimum-mass-like gas disc spread outwards and inwards, losing the mass concentration at ~1 AU.“We found that even if all the planetesimals form at ~1 AU in a minimum mass solar nebula-like disc, the system tends to spread radially as accretion proceeds, resulting in a system of planetary embryos lacking mass-concentration at ~1 AU.”
   2. UncheckedIn these simulations, a gas disc with a concave surface density peaking near 1 AU keeps planetary mass concentrated there and limits radial spreading.“Modifying the surface density of the gas disc into a concave shape with a peak at ~1 AU helps to maintain mass concentrated at ~1 AU and solve the radial dispersion problem.”
   3. Unchecked“We further propose that such a disc should be short lived (<= 1 Myr) and with a shallower radial gradient in the innermost region (< 1 AU) than previously proposed to prevent a too-rapid growth of Earth.”