A Multifrequency ALMA Characterization of Substructures in the GM Aur Protoplanetary Disk
Author
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Huang, Jane
Author
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Andrews, Sean M.
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Dullemond, Cornelis P.
Author
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Öberg, Karin I.
Author
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Qi, Chunhua
Author
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Zhu, Zhaohuan
Author
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Birnstiel, Tilman
Author
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Carpenter, John M.
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Isella, Andrea
Author
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Macías, Enrique
Author
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McClure, Melissa K.
Author
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Pérez Muñoz, Laura
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Teague, Richard
Author
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Wilner, David J.
Author
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Zhang, Shangjia
Admission date
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2020-07-03T02:47:09Z
Available date
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2020-07-03T02:47:09Z
Publication date
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2020
Cita de ítem
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The Astrophysical Journal, 891:48 (25pp), 2020 March 1
es_ES
Identifier
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10.3847/1538-4357/ab711e
Identifier
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https://repositorio.uchile.cl/handle/2250/175781
Abstract
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The protoplanetary disk around the T Tauri star GM Aur was one of the first hypothesized to be in the midst of being cleared out by a forming planet. As a result, GM Aur has had an outsized influence on our understanding of disk structure and evolution. We present 1.1 and 2.1 mm ALMA continuum observations of the GM Aur disk at a resolution of similar to 50 mas (similar to 8 au), as well as HCO+ J = 3 - 2 observations at a resolution of similar to 100 mas. The dust continuum shows at least three rings atop faint, extended emission. Unresolved emission is detected at the center of the disk cavity at both wavelengths, likely due to a combination of dust and free-free emission. Compared to the 1.1 mm image, the 2.1 mm image shows a more pronounced "shoulder" near R similar to 40 au, highlighting the utility of longer-wavelength observations for characterizing disk substructures. The spectral index alpha features strong radial variations, with minima near the emission peaks and maxima near the gaps. While low spectral indices have often been ascribed to grain growth and dust trapping, the optical depth of GM Aur's inner two emission rings renders their dust properties ambiguous. The gaps and outer disk (R > 100 au) are optically thin at both wavelengths. Meanwhile, the HCO+ emission indicates that the gas cavity is more compact than the dust cavity traced by the millimeter continuum, similar to other disks traditionally classified as "transitional."
es_ES
Patrocinador
dc.description.sponsorship
FAS Division of Science, Research Computing Group at Harvard University
National Science Foundation (NSF)
DGE-1144152
National Aeronautics & Space Administration (NASA)
17-XRP17_2-0012
15XRP15_20140
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
Basal AFB-170002
Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT)
CONICYT FONDECYT
11181068
National Science Foundation under CAREER grant
AST-1753168
National Science Foundation (NSF)
AST-1715719