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Keyword: gas drag ×Clear all

2 claims from 1 paper

1. Physics and Astronomy › Astro and Planetary Science

   Shaken, not stirred: Inefficient mixing of CM- and CI-like materials

   Anderson, Vernazza and Broz · Astronomy and Astrophysics · 2026

   N-body simulations suggest that Saturn's growth cannot implant enough CM-like planetesimals in the Uranus-Neptune region to contaminate the CI reservoir, implying limited mixing of carbonaceous materials.

   Unchecked2 claims
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   1. UncheckedIn simulations, fewer than about 2% of CM-like planetesimals end up beyond 15 au, even in gas-rich conditions, because gas drag pulls them back inwards.“While Saturn's growth efficiently scatters CM-like planetesimals, fewer than about 2 percent are implanted beyond 15 au, even under gas-rich conditions, because gas drag damps their eccentricities and drives them back toward their perihelia rather than allowing them to circularize at larger distanc…”
   2. UncheckedIf CM-like material totals about one Earth mass, at most 0.02–0.04 Earth masses reaches 15–25 au, too little to contaminate the CI reservoir.“For a CM mass budget M_CM,tot about 1 M_Earth, this implies at most M_CM < 0.02-0.04 M_Earth reaches 15-25 au, corresponding to a diluted mass fraction < (1-2) x 10^-3 in the outer ring, hence negligible contamination of the CI reservoir.”