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dc.contributor.author
Lin, Zhe Yu Daniel
dc.contributor.author
Li, Zhi Yun
dc.contributor.author
Yang, Haifeng
dc.contributor.author
Stephens, Ian
dc.contributor.author
Looney, Leslie
dc.contributor.author
Harrison, Rachel
dc.contributor.author
Fernandez Lopez, Manuel
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dc.date.available
2023-10-31T09:53:50Z
dc.date.issued
2022-05
dc.identifier.citation
Lin, Zhe Yu Daniel; Li, Zhi Yun; Yang, Haifeng; Stephens, Ian; Looney, Leslie; et al.; Thermal emission and scattering by aligned grains: Plane-parallel model and application to multiwavelength polarization of the HL Tau disc; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 512; 3; 5-2022; 3922-3947
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/216490
dc.description.abstract
Telescopes are now able to resolve dust polarization across circumstellar discs at multiple wavelengths, allowing the study of the polarization spectrum. Most discs show clear evidence of dust scattering through their unidirectional polarization pattern typically at the shorter wavelength of ∼ 870 μm. However, certain discs show an elliptical pattern at ∼3 mm, which is likely due to aligned grains. With HL Tau, its polarization pattern at ∼1.3 mm shows a transition between the two patterns making it the first example to reveal such transition. We use the T-matrix method to model elongated dust grains and properly treat scattering of aligned non-spherical grains with a plane-parallel slab model. We demonstrate that a change in optical depth can naturally explain the polarization transition of HL Tau. At low optical depths, the thermal polarization dominates, while at high optical depths, dichroic extinction effectively takes out the thermal polarization and scattering polarization dominates. Motivated by results from the plane-parallel slab, we develop a simple technique to disentangle thermal polarization of the aligned grains T0 and polarization due to scattering S using the azimuthal variation of the polarization fraction. We find that, with increasing wavelength, the fractional polarization spectrum of the scattering component S decreases, while the thermal component T0 increases, which is expected since the optical depth decreases. We find several other sources similar to HL Tau that can be explained by azimuthally aligned scattering prolate grains when including optical depth effects. In addition, we explore how spirally aligned grains with scattering can appear in polarization images.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
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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
POLARIZATION
dc.subject
PROTOPLANETARY DISCS
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
Thermal emission and scattering by aligned grains: Plane-parallel model and application to multiwavelength polarization of the HL Tau disc
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-10-27T16:16:42Z
dc.journal.volume
512
dc.journal.number
3
dc.journal.pagination
3922-3947
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Lin, Zhe Yu Daniel. University of Virginia; Estados Unidos
dc.description.fil
Fil: Li, Zhi Yun. University of Virginia; Estados Unidos
dc.description.fil
Fil: Yang, Haifeng. Tsinghua University; China
dc.description.fil
Fil: Stephens, Ian. Wocester State University; Estados Unidos
dc.description.fil
Fil: Looney, Leslie. University of Illinois; Estados Unidos. University of Illinois. Urbana - Champaign; Estados Unidos
dc.description.fil
Fil: Harrison, Rachel. University of Illinois. Urbana - Champaign; Estados Unidos
dc.description.fil
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
dc.journal.title
Monthly Notices of the Royal Astronomical Society
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/512/3/3922/6551343
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/stac753
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