Consequences of the simultaneous formation of giant planets by the core accretion mechanism

Context. The core accretion mechanism is presently the most widely accepted cause of the formation of giant planets. For simplicity, most models presently assume that the growth of planetary embryos occurs in isolation. Aims. We explore how the simultaneous growth of two embryos at the present locat...

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Autores principales: Guilera, Octavio Miguel, Brunini, Adrián, Benvenuto, Omar Gustavo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2010
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Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82544
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id I19-R120-10915-82544
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
methods: numerical
planet-disk interactions
planets and satellites: formation
spellingShingle Ciencias Astronómicas
methods: numerical
planet-disk interactions
planets and satellites: formation
Guilera, Octavio Miguel
Brunini, Adrián
Benvenuto, Omar Gustavo
Consequences of the simultaneous formation of giant planets by the core accretion mechanism
topic_facet Ciencias Astronómicas
methods: numerical
planet-disk interactions
planets and satellites: formation
description Context. The core accretion mechanism is presently the most widely accepted cause of the formation of giant planets. For simplicity, most models presently assume that the growth of planetary embryos occurs in isolation. Aims. We explore how the simultaneous growth of two embryos at the present locations of Jupiter and Saturn affects the outcome of planetary formation. Methods. We model planet formation on the basis of the core accretion scenario and include several key physical ingredients. We consider a protoplanetary gas disk that exponentially decays with time. For planetesimals, we allow for a distribution of sizes from 100 m to 100 km with most of the mass in the smaller objects. We include planetesimal migration as well as different profiles for the surface density Σ of the disk. The core growth is computed in the framework of the oligarchic growth regime and includes the viscous enhancement of the planetesimal capture cross-section. Planet migration is ignored. Results. By comparing calculations assuming formation of embryos in isolation to calculations with simultaneous embryo growth, we find that the growth of one embryo generally significantly affects the other. This occurs in spite of the feeding zones of each planet never overlapping. The results may be classified as a function of the gas surface density profile Σ: if Σ ∝-3/2and the protoplanetary disk is rather massive, Jupiter's formation inhibits the growth of Saturn. If Σ ∝r-1 isolated and simultaneous formation lead to very similar outcomes; in the the case of Σ ∝r-1/2 Saturn grows faster and induces a density wave that later accelerates the formation of Jupiter. Conclusions. Our results indicate that the simultaneous growth of several embryos impacts the final outcome and should be taken into account by planet formation models.
format Articulo
Articulo
author Guilera, Octavio Miguel
Brunini, Adrián
Benvenuto, Omar Gustavo
author_facet Guilera, Octavio Miguel
Brunini, Adrián
Benvenuto, Omar Gustavo
author_sort Guilera, Octavio Miguel
title Consequences of the simultaneous formation of giant planets by the core accretion mechanism
title_short Consequences of the simultaneous formation of giant planets by the core accretion mechanism
title_full Consequences of the simultaneous formation of giant planets by the core accretion mechanism
title_fullStr Consequences of the simultaneous formation of giant planets by the core accretion mechanism
title_full_unstemmed Consequences of the simultaneous formation of giant planets by the core accretion mechanism
title_sort consequences of the simultaneous formation of giant planets by the core accretion mechanism
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/82544
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AT bruniniadrian consequencesofthesimultaneousformationofgiantplanetsbythecoreaccretionmechanism
AT benvenutoomargustavo consequencesofthesimultaneousformationofgiantplanetsbythecoreaccretionmechanism
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