J/A+A/578/L6 Polarized images of MWC758 (Benisty+, 2015)
Asymmetric features in the protoplanetary disk MWC758.
Benisty M., Juhasz A., Boccaletti A., Avenhaus H., Milli J., Thalmann C.,
Dominik C., Pinilla P., Buenzli E., Pohl A., Beuzit J.-L., Birnstiel T.,
de Boer J., Bonnefoy M., Chauvin G., Christiaens V., Garufi A., Grady C.,
Henning T., Huelamo N., Isella A., Langlois M., Menard F., Mouillet D.,
Olofsson J., Pantin E., Pinte C., Pueyo L.
<Astron. Astrophys. 578, L6 (2015)>
=2015A&A...578L...6B 2015A&A...578L...6B
ADC_Keywords: YSOs ; Morphology ; Polarization
Keywords: techniques: high angular resolution - protoplanetary disks
Abstract:
The study of dynamical processes in protoplanetary disks is essential
to understand planet formation. In this context, transition disks are
prime targets because they are at an advanced stage of disk clearing
and may harbor direct signatures of disk evolution.
We aim to derive new constraints on the structure of the transition
disk MWC758, to detect non-axisymmetric features and understand their
origin. We obtained infrared polarized intensity observations of the
protoplanetary disk MWC758 with SPHERE/VLT at 1.04 microns to resolve
scattered light at a smaller inner working angle (0.093") and a higher
angular resolution (0.027") than previously achieved.
We observe polarized scattered light within 0.53" (148AU) down to the
inner working angle (26AU) and detect distinct non-axisymmetric
features but no fully depleted cavity. The two small-scale spiral
features that were previously detected with HiCIAO are resolved more
clearly, and new features are identified, including two that are
located at previously inaccessible radii close to the star. We present
a model based on the spiral density wave theory with two planetary
companions in circular orbits. The best model requires a high disk
aspect ratio (H/r∼0.20 at the planet locations) to account for the
large pitch angles which implies a very warm disk.
Our observations reveal the complex morphology of the disk MWC758. To
understand the origin of the detected features, the combination of
high-resolution observations in the submillimeter with ALMA and
detailed modeling is needed.
Description:
SPHERE/IRDIS polarized intensity images of MWC758, in arbitrary units.
Each pixel has been scaled with the square of its distance from the
star.
Objects:
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RA (2000) DE Designation(s)
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05 30 27.53 +25 19 57.1 MWC758 = HD 36112
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 117 2 List of fits images
fits/* . 2 Individual fits images
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 8 F8.5 deg RAdeg Right ascension of center (J2000)
9- 17 F9.5 deg DEdeg Declination of center (J2000)
19- 22 I4 --- Nx [1024] Number of pixels along X-axis
24- 27 I4 --- Ny [1024] Number of pixels along Y-axis
29- 32 I4 Kibyte size [4103] Size of the fits file
34- 67 A34 --- FileName Name of the FITS file in subdirectory fits
69-117 A49 --- Title Title of the file
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Acknowledgements:
Myriam Benisty, Myriam.Benisty(at)obs.ujf-grenoble.fr
(End) Patricia Vannier [CDS] 09-Jun-2015