Photophoresis Boosts Giant Planet Formation

dc.contributor.utaustinauthorDodson-Robinson, S. E.en_US
dc.creatorTeiser, J.en_US
dc.creatorDodson-Robinson, S. E.en_US
dc.date.accessioned2016-04-22T19:45:13Z
dc.date.available2016-04-22T19:45:13Z
dc.date.issued2013-07en
dc.description.abstractIn the core accretion model of giant planet formation, a solid protoplanetary core begins to accrete gas directly from the nebula when its mass reaches similar to 5 M-circle plus. The protoplanet has at most a few million years to reach runaway gas accretion, as young stars lose their gas disks after 10 million years at the latest. Yet gas accretion also brings small dust grains entrained in the gas into the planetary atmosphere. Dust accretion creates an optically thick protoplanetary atmosphere that cannot efficiently radiate away the kinetic energy deposited by incoming planetesimals. A dust-rich atmosphere severely slows down atmospheric cooling, contraction, and inflow of new gas, in contradiction to the observed timescales of planet formation. Here we show that photophoresis is a strong mechanism for pushing dust out of the planetary atmosphere due to the momentum exchange between gas and dust grains. The thermal radiation from the heated inner atmosphere and core is sufficient to levitate dust grains and to push them outward. Photophoresis can significantly accelerate the formation of giant planets.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNational Science Foundation CAREER AST-1055910en_US
dc.identifierdoi:10.15781/T2PJ62
dc.identifier.citationTeiser, Jens, and Sarah E. Dodson-Robinson. >Photophoresis boosts giant planet formation.> Astronomy & Astrophysics, Vol. 555 (Jul., 2013): A98.en_US
dc.identifier.doi10.1051/0004-6361/201321582en_US
dc.identifier.issn0004-6361en_US
dc.identifier.urihttp://hdl.handle.net/2152/34380
dc.language.isoEnglishen_US
dc.relation.ispartofserialAstronomy & Astrophysicsen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectplanets and satellites: formationen_US
dc.subjectprotoplanetary disksen_US
dc.subjectmethods:en_US
dc.subjectnumericalen_US
dc.subjectprotoplanetary disksen_US
dc.subjectspherical-particlesen_US
dc.subjectcircumstellar disksen_US
dc.subjectsmallen_US
dc.subjectgrainsen_US
dc.subjecthost starsen_US
dc.subjectdusten_US
dc.subjectaccretionen_US
dc.subjectgrowthen_US
dc.subjectgasen_US
dc.subjectcoreen_US
dc.subjectastronomy & astrophysicsen_US
dc.titlePhotophoresis Boosts Giant Planet Formationen_US
dc.typeArticleen_US

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