2009A&A...508.1423T


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET08:38:49

2009A&A...508.1423T - Astronomy and Astrophysics, volume 508, 1423-1427 (2009/12-4)

Optical linear polarization in ultra cool dwarfs. A tool to probe dust in the ultra cool dwarf atmospheres.

TATA R., MARTIN E.L., SENGUPTA S., PHAN-BAO N., ZAPATERO OSORIO M.R. and BOUY H.

Abstract (from CDS):

Recent studies have detected linear polarization in L dwarfs in the optical I band. Theoretical models have been developed to explain this polarization. These models predict higher polarization at shorter wavelengths. We discuss the polarization in the R and I band of 4 ultra cool dwarfs. We report linear polarization measurements of 4 ultra cool dwarfs in the R and I bands using the Intermediate dispersion Spectrograph and Imaging System (ISIS) mounted on the 4.2m William Herschel Telescope (WHT). As predicted by theoretical models, we find a higher degree of polarization in the R band when compared to polarization in the I band for 3/4 of these ultra cool dwarfs. This suggests that dust scattering asymmetry is caused by oblateness. We also show how these measurements fit the theoretical models. A case for variability of linear polarization is found, which suggests the presence of randomly distributed dust clouds. We also discuss one case for the presence of a cold debris disk.

Abstract Copyright:

Journal keyword(s): polarization - atmospheric effects - stars: low-mass, brown dwarfs

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 2MASS J12043036+3212595 BD* 12 04 30.3586594618 +32 12 59.518262384           L0e 15 0
2 2MASSI J1438082+640836 BD* 14 38 08.2697433222 +64 08 36.301255174       18.8   L0.2V 22 0
3 2MASSW J1507476-162738 BD* 15 07 47.6756748763 -16 27 40.118410414     22.136 18.928 16.579 L5V 174 0
4 LSPM J1731+2721 BD* 17 31 29.7424764159 +27 21 23.234590972   20.1   17.6 14.9 L0 35 0
5 2MASS J18071593+5015316 BD* 18 07 15.9376984448 +50 15 31.634072578           L1 35 0
6 NAME Cyg OB2 A * 20 30 43.7 +41 03 53     13.12     OB 3 0

    Equat.    Gal    SGal    Ecl

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