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dc.contributor.author
Harris, Robert J.
dc.contributor.author
Cox, Erin G.
dc.contributor.author
Looney, Leslie W.
dc.contributor.author
Li, Zhi-Yun
dc.contributor.author
Yang, Haifeng
dc.contributor.author
Fernandez Lopez, Manuel
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dc.contributor.author
Kwon, Woojin
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Sadavoy, Sarah
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Segura Cox, Dominique
dc.contributor.author
Stephens, Ian
dc.contributor.author
Tobin, John
dc.date.available
2019-08-28T19:38:27Z
dc.date.issued
2018-07
dc.identifier.citation
Harris, Robert J.; Cox, Erin G.; Looney, Leslie W.; Li, Zhi-Yun; Yang, Haifeng; et al.; ALMA Observations of Polarized 872 μm Dust Emission from the Protostellar Systems VLA 1623 and L1527; IOP Publishing; Astrophysical Journal; 861; 2; 7-2018; 1-22
dc.identifier.issn
0004-637X
dc.identifier.uri
http://hdl.handle.net/11336/82424
dc.description.abstract
We present high-sensitivity (σ I ∼ 0.2-0.5 mJy, σ QU ∼ 0.05 mJy), high-resolution (∼0.″12 -0.″2) observations of polarized 872 μm dust emission from the young multiple system VLA 1623 in ρ Ophiuchus and the protostar L1527 in Taurus. We detect the circumstellar material of VLA 1623A, the extended Keplerian disk surrounding VLA 1623A that we call VLA 1623CBdisk, VLA 1623B, VLA 1623W, and L1527 strongly in the polarized emission, at the ∼1%-3% level. We spatially resolve VLA 1623A into two sources, VLA 1623Aa and VLA 1623Ab, separated by ∼30 au and located within a cavity of radius ∼50 au within the circumbinary Keplerian disk, as well as the edge-on disk of VLA 1623W. The polarization angle of the emission is uniform across each protostellar source and nearly coincides with each disk's minor axis. The offsets between the minor axis position angle and the polarization angle are not uniformly distributed at the P ≲ 2 ×10-4 level. The circumbinary disk surrounding VLA 1623Aab is azimuthally symmetrically polarized. Each compact source's emission is partially optically thick (τ 1) at 872 μm, complicating interpretations of polarization involving aligned grains. We find evidence against alignment by radiative flux in each source, particularly in the edge-on VLA 1623W and L1527. We detect astrometric offsets between the polarized emission and the total intensity in VLA 1623Aa, VLA 1623Ab, and VLA 1623B, as predicted if self-scattering in the optically thick limit operates. We conclude that self-scattering is likely responsible for disk-scale polarization at 872 μm in these systems.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
IOP Publishing
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Circumstellar Matter
dc.subject
Scattering
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Stars: Formation
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Stars: Magnetic Field
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
ALMA Observations of Polarized 872 μm Dust Emission from the Protostellar Systems VLA 1623 and L1527
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-08-16T16:49:19Z
dc.journal.volume
861
dc.journal.number
2
dc.journal.pagination
1-22
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Harris, Robert J.. University of Illinois. Urbana - Champaign; Estados Unidos
dc.description.fil
Fil: Cox, Erin G.. University of Illinois. Urbana - Champaign; Estados Unidos
dc.description.fil
Fil: Looney, Leslie W.. University of Illinois. Urbana - Champaign; Estados Unidos
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Fil: Li, Zhi-Yun. University of Virginia; Estados Unidos
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Fil: Yang, Haifeng. University of Virginia; Estados Unidos
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Fil: Fernandez Lopez, Manuel. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
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Fil: Kwon, Woojin. Korea Astronomy And Space Science Institute; Corea del Sur
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Fil: Sadavoy, Sarah. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
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Fil: Segura Cox, Dominique. University of Illinois. Urbana - Champaign; Estados Unidos
dc.description.fil
Fil: Stephens, Ian. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
dc.description.fil
Fil: Tobin, John. Oklahoma State University; Estados Unidos. Leiden University; Países Bajos
dc.journal.title
Astrophysical Journal
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.3847/1538-4357/aac6ec
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.3847/1538-4357/aac6ec
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