Polarization of ultra-cool dwarfs

Details Polarization of ultra-cool dwarfs Polarization of ultra-cool dwarfs

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..525g&link_type=abstract

COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.

Astronomy and Astrophysics

Astronomy

Low Luminosity Stars, Subdwarfs, And Brown Dwarfs, Charge-Coupled Devices, Image Detectors, And Ir Detector Arrays, Astronomical And Space-Research Instrumentation

Scientific paper

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-σ level) than previously reported.

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