Issue |
A&A
Volume 492, Number 3, December IV 2008
|
|
---|---|---|
Page(s) | 731 - 734 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:200810723 | |
Published online | 20 November 2008 |
Research Note
Near-infrared multiwavelength imaging polarimetry of the low-mass proto-stellar object HL Tauri
1
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany e-mail: murakawa@mpifr-bonn.mpg.de
2
Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku place, Hilo, HI 96720, USA
Received:
31
July
2008
Accepted:
15
October
2008
We present the -band high-resolution polarimetric images of the low-mass
proto-stellar object HL Tau using the adaptive optics-equipped
CIAO instrument on the Subaru telescope. Our polarization images show
a butterfly-shaped polarization disk with an
extension. In the nebula, where polarization vectors are centro-symmetrically
aligned, the polarization is as high as
,
,
and
. On the other hand, low polarizations of
% in the
J, H, and K bands and a low color excess ratio of
compared to the standard cloud value of 1.75 are detected towards the central
star. We estimated the upper limit of the grain sizes
to be
0.4 μm in the nebula and
0.7 μm in the line of sight towards
the central star. Our high-resolution polarimetric data, which spatially
resolves the polarization disk, provides us with important information about
grain growth in the region close to the central star.
Key words: polarization / ISM: dust, extinction
© ESO, 2008
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