Complex Spiral Structure in the HD 100546 Transitional Disk as Revealed by GPI and MagAO
Creators: name: Follette, Katherine B.
name: Rameau, Julien
name: Dong, Ruobing
name: Pueyo, Laurent
name: Close, Laird M.
name: Duchene, Gaspard
name: Fung, Jeffrey
name: Leonard, Clare
name: Macintosh, Bruce
name: Males, Jared R.
name: Marois, Christian
name: Millar-Blanchaer, Maxwell A.
name: Morzinski, Katie M.
name: Mullen, Wyatt
name: Perrin, Marshall
name: Spiro, Elijah
name: Wang, Jason
name: Ammons, S. Mark
name: Bailey, Vanessa P.
name: Barman, Travis
name: Bulger, Joanna
name: Chilcote, Jeffrey
name: Cotten, Tara
name: De Rosa, Robert J.
name: Doyon, Rene
name: Fitzgerald, Michael P.
name: Goodsell, Stephen J.
name: Graham, James R.
name: Greenbaum, Alexandra Z.
name: Hibon, Pascale
name: Hung, Li-Wei
name: Ingraham, Patrick
name: Kalas, Paul
name: Konopacky, Quinn
name: Larkin, James E.
name: Maire, Jerome
name: Marchis, Franck
name: Metchev, Stanimir
name: Nielsen, Eric L.
name: Oppenheimer, Rebecca
name: Palmer, David
name: Patience, Jennifer
name: Poyneer, Lisa
name: Rajan, Abhijith
name: Rantakyro, Fredrik T.
name: Savransky, Dmitry
name: Schneider, Adam C.
name: Sivaramakrishnan, Anand
name: Song, Inseok
name: Soummer, Remi
name: Thomas, Sandrine
name: Vega, David
name: Wallace, J. Kent
name: Ward-Duong, Kimberly
name: Wiktorowicz, Sloane
name: Wolff, Schuyler
Publisher: name: arXiv
Year: 2017
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present optical and near-infrared high contrast images of the transitional disk HD 100546 taken with the Magellan Adaptive Optics system (MagAO) and the Gemini Planet Imager (GPI). GPI data include both polarized intensity and total intensity imagery, and MagAO data are taken in Simultaneous Differential Imaging mode at Hα. The new GPI H -band total intensity data represent a significant enhancement in sensitivity and field rotation compared to previous data sets and enable a detailed exploration of substructure in the disk. The data are processed with a variety of differential imaging techniques (polarized, angular, reference, and simultaneous differential imaging) in an attempt to identify the disk structures that are most consistent across wavelengths, processing techniques, and algorithmic parameters. The inner disk cavity at 15 au is clearly resolved in multiple datasets, as are a variety of spiral features. While the cavity and spiral structures are identified at levels significantly distinct from the neighboring regions of the disk under several algorithms and with a range of algorithmic parameters, emission at the location of HD 100546 c varies from point-like under aggressive algorithmic parameters to a smooth continuous structure with conservative parameters, and is consistent with disk emission. Features identified in the HD100546 disk bear qualitative similarity to computational models of a moderately inclined two-armed spiral disk, where projection effects and wrapping of the spiral arms around the star result in a number of truncated spiral features in forward-modeled images.
description: accepted to AJ