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Abstract: The dynamical interactions that occur in newly formed planetary systems mayreflect the conditions occurring in the protoplanetary disk out of which theyformed. With this in mind, we explore the attainment and maintenance of orbitalresonances by migrating planets in the terrestrial mass range. Migration timescales varying between millions of years and thousands of years are considered.In the former case, for which the migration time is comparable to the lifetimeof the protoplanetary gas disk, a 2:1 resonance may be formed. In the latter,relatively rapid migration regime commensurabilities of high degree such as 8:7or 11:10 may be formed. However, in any one large-scale migration severaldifferent commensurabilities may be formed sequentially, each being associatedwith significant orbital evolution. We also use a simple analytic theory todevelop conditions for first order commensurabilities to be formed. Thesedepend on the degree of the commensurability, the imposed migration andcircularization rates, and the planet mass ratios. These conditions are foundto be consistent with the results of our simulations.



Autor: John C.B. Papaloizou DAMTP, Cambridge, Ewa Szuszkiewicz CASA*, Szczecin

Fuente: https://arxiv.org/



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