High-Contrast study of the candidate planets and protoplanetary disk around HD~100546
Abstract
The nearby Herbig Be star HD100546 is known to be a laboratory for the study of protoplanets and their relation with the circumstellar disk that is carved by at least 2 gaps. We observed the HD100546 environment with high contrast imaging exploiting several different observing modes of SPHERE, including datasets with/without coronagraphs, dual band imaging, integral field spectroscopy and polarimetry. The picture emerging from these different data sets is complex. Flux-conservative algorithms images clearly show the disk up to 200au. More aggressive algorithms reveal several rings and warped arms overlapping the main disk. The bright parts of this ring lie at considerable height over the disk mid-plane at about 30au. Our images demonstrate that the brightest wings close to the star in the near side of the disk are a unique structure, corresponding to the outer edge of the intermediate disk at ~40au. Modeling of the scattered light from the disk with a geometrical algorithm reveals that a moderately thin structure can well reproduce the light distribution in the flux-conservative images. We suggest that the gap between 44 and 113 au span between the 1:2 and 3:2 resonance orbits of a massive body located at ~70au that might coincide with the candidate planet HD100546b detected with previous thermal IR observations. In this picture, the two wings can be the near side of a ring formed by disk material brought out of the disk at the 1:2 resonance with the same massive object. While we find no clear evidence confirming detection of the planet candidate HD100546c in our data, we find a diffuse emission close to the expected position of HD100546b. This source can be described as an extremely reddened substellar object surrounded by a dust cloud or its circumplanetary disk. Its astrometry is broadly consistent with a circular orbital motion on the disk plane.
Keywords
Cite
@article{arxiv.1809.01001,
title = {High-Contrast study of the candidate planets and protoplanetary disk around HD~100546},
author = {E. Sissa and R. Gratton and A. Garufi and E. Rigliaco and A. Zurlo and D. Mesa and M. Langlois and J. de Boer and S. Desidera and C. Ginski and A. -M. Lagrange and A. -L. Maire and A. Vigan and M. Dima and J. Antichi and A. Baruffolo and A. Bazzon and M. Benisty and J. -L. Beuzit and B. Biller and A. Boccaletti and M. Bonavita and M. Bonnefoy and W. Brandner and P. Bruno and E. Buenzli and E. Cascone and G. Chauvin and A. Cheetham and R. U. Claudi and M. Cudel and V. De Caprio and C. Dominik and D. Fantinel and G. Farisato and M. Feldt and C. Fontanive and R. Galicher and E. Giro and J. Hagelberg and S. Incorvaia and M. Janson and M. Kasper and M. Keppler and T. Kopytova and E. Lagadec and J. Lannier and C. Lazzoni and H. LeCoroller and L. Lessio and R. Ligi and F. Marzari and F. Menard and M. R. Meyer and D. Mouillet and S. Peretti and C. Perrot and P. J. Potiron and D. Rouan and B. Salasnich and G. Salter and M. Samland and T. Schmidt and S. Scuderi and F. Wildi},
journal= {arXiv preprint arXiv:1809.01001},
year = {2018}
}
Comments
Accepted by A&A on 30/08/2018