THE COMPOSITIONAL DIVERSITY OF EXTRASOLAR TERRESTRIAL PLANETS. II. MIGRATION SIMULATIONS
Identifieur interne : 005871 ( Main/Exploration ); précédent : 005870; suivant : 005872THE COMPOSITIONAL DIVERSITY OF EXTRASOLAR TERRESTRIAL PLANETS. II. MIGRATION SIMULATIONS
Auteurs : Jade C. Carter-Bond [Australie] ; David P. O'Brien [États-Unis] ; Sean N. Raymond [France]Source :
- The Astrophysical journal [ 0004-637X ] ; 2012.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
Prior work has found that a variety of terrestrial planetary compositions are expected to occur within known extrasolar planetary systems. However, such studies ignored the effects of giant planet migration, which is thought to be very common in extrasolar systems. Here we present calculations of the compositions of terrestrial planets that formed in dynamical simulations incorporating varying degrees of giant planet migration. We used chemical equilibrium models of the solid material present in the disks of five known planetary host stars: the Sun, GJ 777, HD4203, HD19994, and HD213240. Giant planet migration has a strong effect on the compositions of simulated terrestrial planets as the migration results in large-scale mixing between terrestrial planet building blocks that condensed at a range of temperatures. This mixing acts to (1) increase the typical abundance of Mg-rich silicates in the terrestrial planets' feeding zones and thus increase the frequency of planets with Earth-like compositions compared with simulations with static giant planet orbits, and (2) drastically increase the efficiency of the delivery of hydrous phases (water and serpentine) to terrestrial planets and thus produce waterworlds and/or wet Earths. Our results demonstrate that although a wide variety of terrestrial planet compositions can still be produced, planets with Earth-like compositions should be common within extrasolar planetary systems.
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O'Brien</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Planetary Science Institute, 1700 East Fort Lowell</s1><s2>Tucson, AZ 85719</s2><s3>USA</s3><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Tucson, AZ 85719</wicri:noRegion></affiliation></author><author><name sortKey="Raymond, Sean N" sort="Raymond, Sean N" uniqKey="Raymond S" first="Sean N." last="Raymond">Sean N. Raymond</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Observatoire Aquitain des Sciences de l'Univers, Université de Bordeaux, 2 rue de l'Observatoire, BP 89</s1><s2>33271 Floirac</s2><s3>FRA</s3><sZ>3 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>33271 Floirac</wicri:noRegion><wicri:noRegion>BP 89</wicri:noRegion><wicri:noRegion>33271 Floirac</wicri:noRegion></affiliation><affiliation wicri:level="1"><inist:fA14 i1="04"><s1>CNRS, UMR 5804, Laboratoire d'Astrophysique de Bordeaux. 2 rue de l'Observatoire, BP 89</s1><s2>33271 Floirac</s2><s3>FRA</s3><sZ>3 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>33271 Floirac</wicri:noRegion><wicri:noRegion>BP 89</wicri:noRegion><wicri:noRegion>33271 Floirac</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">The Astrophysical journal</title><title level="j" type="abbreviated">Astrophys. j.</title><idno type="ISSN">0004-637X</idno><imprint><date when="2012">2012</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">The Astrophysical journal</title><title level="j" type="abbreviated">Astrophys. j.</title><idno type="ISSN">0004-637X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Abundance</term><term>Chemical equilibrium</term><term>Chemical model</term><term>Earth planet</term><term>Extrasolar planets</term><term>Giant planet</term><term>Mixing</term><term>Orbits</term><term>Planetary cosmogony</term><term>Planetary system</term><term>Sun</term><term>Terrestrial planet</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Planète extrasolaire</term><term>Planète terrestre</term><term>Système planétaire</term><term>Planète géante</term><term>Modèle chimique</term><term>Equilibre chimique</term><term>Soleil</term><term>Mélangeage</term><term>Abondance</term><term>Planète Terre</term><term>Orbite</term><term>Cosmogonie planétaire</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Prior work has found that a variety of terrestrial planetary compositions are expected to occur within known extrasolar planetary systems. However, such studies ignored the effects of giant planet migration, which is thought to be very common in extrasolar systems. Here we present calculations of the compositions of terrestrial planets that formed in dynamical simulations incorporating varying degrees of giant planet migration. We used chemical equilibrium models of the solid material present in the disks of five known planetary host stars: the Sun, GJ 777, HD4203, HD19994, and HD213240. Giant planet migration has a strong effect on the compositions of simulated terrestrial planets as the migration results in large-scale mixing between terrestrial planet building blocks that condensed at a range of temperatures. This mixing acts to (1) increase the typical abundance of Mg-rich silicates in the terrestrial planets' feeding zones and thus increase the frequency of planets with Earth-like compositions compared with simulations with static giant planet orbits, and (2) drastically increase the efficiency of the delivery of hydrous phases (water and serpentine) to terrestrial planets and thus produce waterworlds and/or wet Earths. Our results demonstrate that although a wide variety of terrestrial planet compositions can still be produced, planets with Earth-like compositions should be common within extrasolar planetary systems.</div></front></TEI><affiliations><list><country><li>Australie</li><li>France</li><li>États-Unis</li></country></list><tree><country name="Australie"><noRegion><name sortKey="Carter Bond, Jade C" sort="Carter Bond, Jade C" uniqKey="Carter Bond J" first="Jade C." last="Carter-Bond">Jade C. Carter-Bond</name></noRegion></country><country name="États-Unis"><noRegion><name sortKey="O Brien, David P" sort="O Brien, David P" uniqKey="O Brien D" first="David P." last="O'Brien">David P. O'Brien</name></noRegion></country><country name="France"><noRegion><name sortKey="Raymond, Sean N" sort="Raymond, Sean N" uniqKey="Raymond S" first="Sean N." last="Raymond">Sean N. Raymond</name></noRegion><name sortKey="Raymond, Sean N" sort="Raymond, Sean N" uniqKey="Raymond S" first="Sean N." last="Raymond">Sean N. Raymond</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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