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Complex spiral structure in the HD 100546 transitional disk as revealed by GPI and MagAO.

Follette, Katherine B. and Rameau, Julien and Dong, Ruobing and Pueyo, Laurent and Close, Laird M. and Duchêne, Gaspard and Fung, Jeffrey and Leonard, Clare and Macintosh, Bruce and Males, Jared R. and Marois, Christian and Millar-Blanchaer, Maxwell A. and Morzinski, Katie M. and Mullen, Wyatt and Perrin, Marshall and Spiro, Elijah and Wang, Jason and Ammons, S. Mark and Bailey, Vanessa P. and Barman, Travis and Bulger, Joanna and Chilcote, Jeffrey and Cotten, Tara and De Rosa, Robert J. and Doyon, Rene and Fitzgerald, Michael P. and Goodsell, Stephen J. and Graham, James R. and Greenbaum, Alexandra Z. and Hibon, Pascale and Hung, Li-Wei and Ingraham, Patrick and Kalas, Paul and Konopacky, Quinn and Larkin, James E. and Maire, Jérôme and Marchis, Franck and Metchev, Stanimir and Nielsen, Eric L. and Oppenheimer, Rebecca and Palmer, David and Patience, Jennifer and Poyneer, Lisa and Rajan, Abhijith and Rantakyrö, Fredrik T. and Savransky, Dmitry and Schneider, Adam C. and Sivaramakrishnan, Anand and Song, Inseok and Soummer, Remi and Thomas, Sandrine and Vega, David and Wallace, J. Kent and Ward-Duong, Kimberly and Wiktorowicz, Sloane and Wolff, Schuyler (2017) 'Complex spiral structure in the HD 100546 transitional disk as revealed by GPI and MagAO.', Astronomical journal., 153 (6). p. 264.


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 data sets, 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 HD 100546 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.

Item Type:Article
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Publisher statement:© 2017. The American Astronomical Society. All rights reserved.
Date accepted:13 April 2017
Date deposited:06 July 2017
Date of first online publication:22 May 2017
Date first made open access:06 July 2017

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