J/A+A/559/A62ivo://CDS.VizieR/J/A+A/559/A62doi:10.26093/cds/vizier.35590062CDSWada K.Tanaka H.Okuzumi S.Kobayashi H.Suyama T.Kimura H.,Yamamoto T.2014-05-18T13:53:32Z2013-11-14T08:46:30ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frastronomical-modelssolar-system-planetsCollisional growth of dust aggregates is an essential process to form planetesimals in protoplanetary disks, but disruption through high-velocity collisions (disruption barrier) could prohibit the dust growth. Mass transfer through highly different-sized collisions has been suggested to be a way to circumvent the disruption barrier. We examine how the collisional growth efficiency of dust aggregates at different impact parameters depends on the size and the mass-ratio of colliding aggregates. We use an N-body code to numerically simulate the collisions of different-sized aggregates. Our results show that large values of the impact parameter are important and the growth efficiency averaged over the impact parameter does not depend on the aggregate size although the growth efficiency for nearly head-on collisions increases with size. We also find that the averaged growth efficiency tends to increase with increasing the mass-ratio of colliding aggregates. However, the critical collision velocity, above which the growth efficiency becomes negative, does not strongly depend on the mass-ratio. These results indicate icy dust can grow through high-velocity offset collisions at several tens of m/s, the maximum collision velocity experienced in protoplanetary disks, whereas it is still difficult for silicate dust to grow in protoplanetary disks.2013A&A...559A..62Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/559/A62CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/559/A62https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/559/A62http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/559/A62https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/559/A62https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/559/A62http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/559/A62GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/559/A62/tableNumerical data for each runrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNpNumber N_proj_ of particles of projectile aggregate (500, 2000 or 8000)meta.numberintNtNumber of particles of target aggregate (32000, 128000 or 512000)meta.numberintRN[1/3] Random number to make aggregatesmeta.numberintucol[15/350] Collision velocitym/sphys.velocdoubleb2[0/1] Square of impact parameter (b/b_max_)^2^src.impactParamfloatf[-12/1] Growth efficiencystat.paramdoubleMej/MpTotal ejecta mass ratio M_ej_/M_proj_phys.mass;arith.ratiofloat