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We present optical and near-infrared high contrast images of the transitionaldisk HD 100546 taken with the Magellan Adaptive Optics system (MagAO) and theGemini Planet Imager (GPI). GPI data include both polarized intensity and totalintensity imagery, and MagAO data are taken in Simultaneous DifferentialImaging mode at H{\alpha}. The new GPI H -band total intensity data represent asignificant enhancement in sensitivity and field rotation compared to previousdata sets and enable a detailed exploration of substructure in the disk. Thedata are processed with a variety of differential imaging techniques(polarized, angular, reference, and simultaneous differential imaging) in anattempt to identify the disk structures that are most consistent acrosswavelengths, processing techniques, and algorithmic parameters. The inner diskcavity at 15 au is clearly resolved in multiple datasets, as are a variety ofspiral features. While the cavity and spiral structures are identified atlevels significantly distinct from the neighboring regions of the disk underseveral algorithms and with a range of algorithmic parameters, emission at thelocation of HD 100546 c varies from point-like under aggressive algorithmicparameters to a smooth continuous structure with conservative parameters, andis consistent with disk emission. Features identified in the HD100546 disk bearqualitative similarity to computational models of a moderately inclinedtwo-armed spiral disk, where projection effects and wrapping of the spiral armsaround the star result in a number of truncated spiral features inforward-modeled images.

Complex Spiral Structure in the HD 100546 Transitional Disk as Revealed by GPI and MagAO