2002A&A...396L..35M


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.25CET21:14:41

2002A&A...396L..35M - Astronomy and Astrophysics, volume 396, L35-38 (2002/12-4)

Optical linear polarimetry of ultra cool dwarfs.

MENARD F., DELFOSSE X. and MONIN J.-L.

Abstract (from CDS):

We present optical linear polarimetry of 8 ultra cool field dwarfs, with spectral types ranging from M9 to L8. The linear polarisation, P, of each dwarf we measured is P<0.2%. Three dwarfs have polarisations compatible with zero, two are marginal detections, and three have significant polarisation. Due to their small distance, an insterstellar origin for the detected polarisation can be safely ruled out. Our detections confirm that dust is present in the atmosphere of these brown dwarfs and that the scattering geometry is not symmetric. Possibilities for asymmetry include the dwarfs rotating rapidly and being oblate, or the cloud coverage in the atmosphere being inhomogenous.

Abstract Copyright:

Journal keyword(s): stars: low-mass, brown dwarfs - polarization - dust - scattering - stars: atmospheres

Simbad objects: 7

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Number of rows : 7

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 L 362-29 B BD* 00 04 34.8641153471 -40 44 06.464450691       19.61 16.88 L5+L5 95 0
2 2MASSW J0015447+351603 BD* 00 15 44.7737086408 +35 16 02.639395150           L1.0V 37 0
3 LSPM J0036+1821 BD* 00 36 16.1119130763 +18 21 10.291990145       18.451 16.053 L3.5 189 0
4 DENIS J025503.3-470049 BD* 02 55 03.6945042584 -47 00 51.345365454     22.921 19.906 17.454 L9 126 0
5 DENIS J200048.3-752306 LM* 20 00 48.4151539551 -75 23 06.872158469     21.157 18.379 16.119 M9 23 0
6 2MASS J20575409-0252302 BD* 20 57 54.0935087240 -02 52 30.249848091           L1 52 0
7 2MASSW J2224438-015852 BD* 22 24 43.8550503291 -01 58 53.265872547           L4.5V 110 0

    Equat.    Gal    SGal    Ecl

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