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Shadows cast on the transition disk of HD 135344B | | T. Stolker
; C. Dominik
; H. Avenhaus
; M. Min
; J. de Boer
; C. Ginski
; H.M. Schmid
; A. Juhasz
; A. Bazzon
; L.B.F.M. Waters
; A. Garufi
; J.-C. Augereau
; M. Benisty
; A. Boccaletti
; Th. Henning
; A.-L. Maire
; F. Menard
; M.R. Meyer
; M. Langlois
; C. Pinte
; S.P. Quanz
; C. Thalmann
; J.-L. Beuzit
; M. Carbillet
; A. Costille
; K. Dohlen
; M. Feldt
; D. Gisler
; D. Mouillet
; A. Pavlov
; D. Perret
; C. Petit
; J. Pragt
; S. Rochat
; R. Roelfsema
; B. Salasnich
; C. Soenke
; F. Wildi
; | | Date: |
1 Mar 2016 | | Abstract: | The protoplanetary disk of the F-type star HD 135344B (SAO 206462) is in a
transition stage and shows many intriguing structures both in scattered light
and thermal millimeter emission which are possibly related to planet formation
processes and planet-disk interactions. We have carried out high-contrast
polarimetric differential imaging (PDI) observations with VLT/SPHERE and
obtained the first optical polarized scattered light images with the
sub-instrument ZIMPOL in R- and I-band. Additionally, near-infrared
polarimetric observations were done with IRDIS in Y- and J-band. We will use
the scattered light images, surface brightness profiles and color to study in
detail disk structures and brightness variations. The scattered light images
reveal with unprecedented sensitivity and angular resolution the spiral arm
structure of the disk as well as the inner disk cavity of 25 au in all filters.
Multiple shadow features are discovered on the outer disk and the observations
of the two epochs show indications of variability of one shadow. A positive
surface brightness gradient is observed in the r^2-scaled images in south-west
direction due to an azimuthally asymmetric perturbation of the temperature
and/or surface density by the passing spiral arms. The scattering efficiency in
polarized light shows a positive linear trend towards longer wavelengths
presumably because of large/aggregate dust grains (2pi a >= lambda) in the disk
surface. The shadows on the outer disk of HD 135344B could be cast by an inner
dust belt which is 22 degrees inclined with respect to the outer disk, a warped
disk region which connects the inner disk with the cavity and an accretion
funnel flow from the inner disk onto the star. The wide open spiral arms
indicate the presence of one or multiple massive protoplanets, a local disk
instability beyond the dust cavity or a combination of the two. | | Source: | arXiv, 1603.0481 | | Services: | Forum | Review | PDF | Favorites | |
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