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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 447987.0, MPI für Astronomie / Publikationen_mpia
Polarization of ultra-cool dwarfs
Authors:Goldman, B.; Pitann, J.; Osorio, M. R. Zapatero; Bailer-Jones, C. A. L.; Béjar, V. S.; Caballero, J. A.; Henning, Th
Publisher:AIP, Springer
Place of Publication:New York
Date of Publication (YYYY-MM-DD):2009
Title of Proceedings:Cool Stars, Stellar Systems and the Sun
Start Page:525
End Page:528
Title of Series:AIP Conference Proceedings
Volume (in Series):1094
Review Status:not specified
Audience:Experts Only
Abstract / Description:Ultra-cool dwarfs with effective temperatures between ~1400 K and ~2200 K are known to have dusty atmospheres. Asymmetries of the dwarf surface may arise from rotationally-induced flattening and dust-cloud coverage, and may result in non-zero linear polarisation through dust scattering. Here we present our linear polarimetric imaging measurements using FORS1 at the Very Large Telescope, in Paranal, in the Bessel I filter, and for a subset of our sample in the Bessel R and the Gunn z filters. We report a polarisation degree of (-0.31+/-+0.07)% for LHS102BC. We fail to detect linear polarisation in the rest of our sample, with upper-limits on the polarisation degree of each object of 0.09% to 0.76% (95% of confidence level), depending on the targets and the bands. For six targets, our data indicate polarisation degrees smaller (at the 2-sigma level) than previously reported.
Free Keywords:brown dwarfs; infrared imaging; telescopes
Comment of the Author/Creator:Date: 2009, February 1, 2009
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISBN:978-0735406278 [ID No:1]
URL:http://adsabs.harvard.edu/abs/2009AIPC.1094..525G [ID No:2]
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