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Article: Polarization of L dwarfs by dust scattering

TitlePolarization of L dwarfs by dust scattering
Authors
KeywordsDust, Extinction
Polarization
Scattering
Stars: Atmospheres
Stars: Low-Mass, Brown Dwarfs
Issue Date2005
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637X
Citation
The Astrophysical Journal, 2005, v. 625 n. 2 pt. 1, p. 996-1003 How to Cite?
AbstractThe degree of polarization in L dwarfs of spectral types L0-L6 resulting from dust scattering in a rotation-induced oblate photosphere is calculated. Assuming that forsterite is the main condensate, we derive the atmospheric dust distribution for different spectral types based on a chemical equilibrium model. The degree of polarization at optical is then calculated using a single-scattering model. The expected linear polarization at optical is found to peak at around spectral type L1. For a fixed rotational velocity, the degree of polarization decreases from hotter to cooler objects. However, with the increase in mean grain size, the degree of linear polarization reduces significantly. We fit the recently observed linear polarimetric data of L dwarfs and find that the single dust scattering model coupled with the chemical equilibrium models of condensates is consistent with the observational results. © 2005. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/179688
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorSengupta, Sen_US
dc.contributor.authorKwok, Sen_US
dc.date.accessioned2012-12-19T10:02:50Z-
dc.date.available2012-12-19T10:02:50Z-
dc.date.issued2005en_US
dc.identifier.citationThe Astrophysical Journal, 2005, v. 625 n. 2 pt. 1, p. 996-1003en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/179688-
dc.description.abstractThe degree of polarization in L dwarfs of spectral types L0-L6 resulting from dust scattering in a rotation-induced oblate photosphere is calculated. Assuming that forsterite is the main condensate, we derive the atmospheric dust distribution for different spectral types based on a chemical equilibrium model. The degree of polarization at optical is then calculated using a single-scattering model. The expected linear polarization at optical is found to peak at around spectral type L1. For a fixed rotational velocity, the degree of polarization decreases from hotter to cooler objects. However, with the increase in mean grain size, the degree of linear polarization reduces significantly. We fit the recently observed linear polarimetric data of L dwarfs and find that the single dust scattering model coupled with the chemical equilibrium models of condensates is consistent with the observational results. © 2005. The American Astronomical Society. All rights reserved.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637Xen_US
dc.relation.ispartofThe Astrophysical Journalen_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectDust, Extinctionen_US
dc.subjectPolarizationen_US
dc.subjectScatteringen_US
dc.subjectStars: Atmospheresen_US
dc.subjectStars: Low-Mass, Brown Dwarfsen_US
dc.titlePolarization of L dwarfs by dust scatteringen_US
dc.typeArticleen_US
dc.identifier.emailKwok, S: deannote@hku.hken_US
dc.identifier.authorityKwok, S=rp00716en_US
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1086/429659en_US
dc.identifier.scopuseid_2-s2.0-22544432875en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-22544432875&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume625en_US
dc.identifier.issue2 pt. 1en_US
dc.identifier.spage996en_US
dc.identifier.epage1003en_US
dc.identifier.isiWOS:000229436900039-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridSengupta, S=7402546751en_US
dc.identifier.scopusauthoridKwok, S=22980498300en_US

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