The characterization of the dust content in the ring around Sz 91: indications of planetesimal formation?
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2021Metadata
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Mauco, Karina
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The characterization of the dust content in the ring around Sz 91: indications of planetesimal formation?
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Abstract
One of the most important questions in the field of planet formation is how millimeter- and centimeter-sized dust
particles overcome radial drift and fragmentation barriers to form kilometer-sized planetesimals. ALMA
observations of protoplanetary disks, in particular transition disks or disks with clear signs of substructures, can
provide new constraints on theories of grain growth and planetesimal formation, and therefore represent one
possibility for progress on this issue. We here present ALMA band 4 (2.1 mm) observations of the transition disk
system Sz 91, and combine them with previously obtained band 6 (1.3 mm) and band 7 (0.9 mm) observations.
Sz 91, with its well-defined millimeter ring, more extended gas disk, and evidence of smaller dust particles close to
the star, constitutes a clear case of dust filtering and the accumulation of millimeter-sized particles in a gas pressure
bump. We compute the spectral index (nearly constant at ∼3.34), optical depth (marginally optically thick), and
maximum grain size (∼0.61 mm) in the dust ring from the multi-wavelength ALMA observations, and compare the
results with recently published simulations of grain growth in disk substructures. Our observational results are in
strong agreement with the predictions of models for grain growth in dust rings that include fragmentation and
planetesimal formation through streaming instability.
Patrocinador
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT 3190859
ANID,-Millennium Science Initiative Program NCN19_171
Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica (PAPIIT)
Universidad Nacional Autonoma de Mexico IN108218
IN111421
IG101321
CONACyT Ciencia de Frontera 86372
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT 1181404
1190748
1180395
Universidad de Valparaiso
DGI-UNAB DI-11-19/R
ANID/CONICYT Programa de Astronomia Fondo ALMACONICYT 2018 31180052
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The Astrophysical Journal, 923:128 (14pp), 2021 December 10
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