Migration-driven diversity of super-Earth compositions
IZIDORO, A.
Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
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Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
IZIDORO, A.
Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
< Reduce
Universidade Estadual Paulista Júlio de Mesquita Filho = São Paulo State University [UNESP]
Language
en
Article de revue
This item was published in
Monthly Notices of the Royal Astronomical Society: Letters. 2018, vol. 479, n° 1, p. L81-L85
Oxford Journals
English Abstract
A leading model for the origin of super-Earths proposes that planetary embryos migrate inward and pile up on close-in orbits. As large embryos are thought to preferentially form beyond the snow line, this naively predicts ...Read more >
A leading model for the origin of super-Earths proposes that planetary embryos migrate inward and pile up on close-in orbits. As large embryos are thought to preferentially form beyond the snow line, this naively predicts that most super-Earths should be very water-rich. Here we show that the shortest-period planets formed in the migration model are often purely rocky. The inward migration of icy embryos through the terrestrial zone accelerates the growth of rocky planets via resonant shepherding. We illustrate this process with a simulation that provided a match to the Kepler-36 system of two planets on close orbits with very different densities. In the simulation, two super-Earths formed in a Kepler-36-like configuration; the inner planet was pure rock while the outer one was ice-rich. We conclude from a suite of simulations that the feeding zones of close-in super-Earths are likely to be broad and disconnected from their final orbital radii.Read less <
English Keywords
Astrophysics - Solar and Stellar Astrophysics
Astrophysics - Earth and Planetary Astrophysics
ANR Project
Modélisation du processus de croissance des planètes Joviennes/ - ANR-13-BS05-0003
Origin
Hal imported