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Large grains can grow in circumstellar discs

Published online by Cambridge University Press:  06 January 2014

Farzana Meru ,
Marina Galvagni ,
Christoph Olczak  and
Pascale Garaud
Farzana Meru
Affiliation:
Institut für Astronomie, ETH Zürich, Wolfgang-Pauli-Strasse 27, 8093 Zürich email: farzana.meru@phys.ethz.ch
Marina Galvagni
Affiliation:
Institute of Theoretical Physics, Universität Zürich, Winterthurerstrasse 190, 8057 Zürich
Christoph Olczak
Affiliation:
Astronomisches Rechen-Institut (ARI), Zentrum für Astronomie Universit{ä}t Heidelberg, M{ö}nchhofstrasse 12-14, 69120 Heidelberg Max-Planck-Institut f{ü}r Astronomie (MPIA), K{ö}nigstuhl 17, 69117 Heidelberg National Astronomical Observatories of China, 20A Datun Lu, Beijing 100012
Pascale Garaud
Affiliation:
Department of Applied Mathematics and Statistics, UCSC, 1156 High Street Santa Cruz
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Abstract

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We perform coagulation & fragmentation simulations to understand grain growth in T Tauri & brown dwarf discs. We present a physically-motivated approach using a probability distribution function for the collision velocities and separating the deterministic & stochastic velocities. We find growth to larger sizes compared to other models. Furthermore, if brown dwarf discs are scaled-down versions of T Tauri discs (in terms of stellar & disc mass, and disc radius), growth at the same location with respect to the outer edge occurs to similar sizes in both discs.

Keywords

methods: analyticalmethods: numericalplanetary systems: protoplanetary disks

References

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