J/A+A/635/A121 HD 139614 polarization Stokes Q and U images (Muro-Arena+, 2020)
Shadowing and multiple rings in the protoplanetary disk of HD 139614.
Muro-Arena G.A., Benisty M., Ginski C., Dominik C., Facchini S.,
Villenave M., van Boekel R., Chauvin G., Garufi A., Henning T.,
Janson K., Keppler M., Matter A., Menard F., Stolker T., Zurlo A.,
Blanchard P., Maurel D., Moeller-Nilsson O., Petit C., Roux A.,
Sevin A., Wildi F.
<Astron. Astrophys. 635, A121 (2020)>
=2020A&A...635A.121M 2020A&A...635A.121M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, pre-main sequence ; Polarization
Keywords: protoplanetary disks - techniques: polarimetric - radiative transfer -
scattering
Abstract:
Shadows in scattered light images of protoplanetary disks are a common
feature and support the presence of warps or misalignments between
disk regions. These warps are possibly due to an inclined
(sub-)stellar companion embedded in the disk. We study the morphology
of the protoplanetary disk around the Herbig Ae star HD 139614 based
on the first scattered light observations of this disk, which we model
with the radiative transfer code MCMax3D. We obtained J- and H-band
observations in polarized scattered light with VLT/SPHERE that show
strong azimuthal asymmetries. In the outer disk, beyond ∼30au, a
broad shadow spans a range of ∼240° in position angle, in the
East. A bright ring at ∼16 au also shows an azimuthally asymmetric
brightness, with the faintest side roughly coincidental with the
brightest region of the outer disk. Additionally, two arcs are
detected at ∼34au and ∼50au. We created a simple 4-zone
approximation to a warped disk model of HD 139614 in order to
qualitatively reproduce these features. The location and misalignment
of the disk components were constrained from the shape and location of
the shadows they cast. We find that the shadow on the outer disk
covers a range of position angle too wide to be explained by a single
inner misaligned component. Our model requires a minimum of two
separate misaligned zones -- or a continuously warped region -- to
cast this broad shadow on the outer disk. A small misalignment of
∼4° between adjacent components can reproduce most of the observed
shadow features. Multiple misaligned disk zones, potentially mimicking
a warp, can explain the observed broad shadows in the HD 139614 disk.
A planetary mass companion in the disk, located on an inclined orbit,
could be responsible for such a feature and for the dust depleted gap
responsible for a dip in the SED.
Description:
Fits images corresponding to the imagery presented in the paper. The
data are obtained with VLT/SPHERE/IRDIS in BB_H and BB_J filter in
polarimetric mode.
We upload a total of 4 observing epochs obtained between 31-03-2016
and 21-06-2018. All but one epoch (obtained on 06-06-2018 in BB_H) use
the IRDIS YJHALCS coronagraph with an inner workign angle of 92.5mas
(defined as the radius at which 50% throughput is achieved).
The data files contain for each epoch a polarization Stokes Q and
Stokes U image that were created from the raw data (available at the
ESO archive), with the publicly available IRDAP pipeline by R. van
Holstein using default parameters.
Stellar polarization was subtracted so that only signal from the
circumstellar disk remains. The star was centered in all images.
Objects:
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RA (2000) DE Designation(s)
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15 40 46.38 -42 29 53.5 HD 139614 = CD-42 10650
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 99 8 List of fits images
fits/* . 8 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- 2 I2 h RAh Right Ascension (J2000)
4- 5 I2 min RAm Right Ascension (J2000)
7- 11 F5.2 s RAs Right Ascension (J2000)
12 A1 --- DE- Declination sign (J2000)
13- 14 I2 deg DEd Declination (J2000)
16- 17 I2 arcmin DEm Declination (J2000)
19- 22 F4.1 arcsec DEs Declination (J2000)
24- 27 I4 --- Nx Number of pixels along X-axis
29- 32 I4 --- Ny Number of pixels along Y-axis
34- 37 I4 Kibyte size Size of FITS file
39- 51 A13 --- FileName Name of FITS file, in subdirectory fits
53- 99 A47 --- Title Title of the FITS file
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Acknowledgements:
Gabriela Alejandra Muro-Arena, g.a.muroarena(at)uva.nl,
Anton Pannekoek Institute, The Netherlands
(End) Patricia Vannier [CDS] 06-Feb-2020