We have observed the protoplanetary disk of the well-known young Herbig star HD 142527 using ZIMPOL Polarimetric Differential Imaging with the VBB (Very Broad Band, ~600-900nm) filter. We obtained two datasets in May 2015 and March 2016. Our data allow us to explore dust scattering around the star down to a radius of ~0.025" (~4au). The well-known outer disk is clearly detected, at higher resolution than before, and shows previously unknown sub-structures, including spirals going inwards into the cavity. Close to the star, dust scattering is detected at high signal-to-noise ratio, but it is unclear whether the signal represents the inner disk, which has been linked to the two prominent local minima in the scattering of the outer disk, interpreted as shadows. An interpretation of an inclined inner disk combined with a dust halo is compatible with both our and previous observations, but other arrangements of the dust cannot be ruled out. Dust scattering is also present within the large gap between ~30 and ~140au. The comparison of the two datasets suggests rapid evolution of the inner regions of the disk, potentially driven by the interaction with the close-in M-dwarf companion, around which no polarimetric signal is detected.
@article{arxiv.1705.09680,
title = {Exploring dust around HD142527 down to 0.025" / 4au using SPHERE/ZIMPOL},
author = {H. Avenhaus and S. P. Quanz and H. M. Schmid and C. Dominik and T. Stolker and C. Ginski and J. de Boer and J. Szulágyi and A. Garufi and A. Zurlo and J. Hagelberg and M. Benisty and T. Henning and F. Ménard and M. R. Meyer and A. Baruffolo and A. Bazzon and J. L. Beuzit and A. Costille and K. Dohlen and J. H. Girard and D. Gisler and M. Kasper and D. Mouillet and J. Pragt and R. Roelfsema and B. Salasnich and J. -F. Sauvage},
journal= {arXiv preprint arXiv:1705.09680},
year = {2017}
}
Comments
11 pages, 7 figures, accepted for publication in AJ