Circumbinary, not transitional: on the spiral arms, cavity, shadows, fast radial flows, streamers, and horseshoe in the HD 142527 disc
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We present 3D hydrodynamical models of the HD 142527 protoplanetary disc, a bright and well-studied disc that shows spirals and shadows in scattered light around a 100 au gas cavity, a large horseshoe dust structure in mm continuum emission, together with mysterious fast radial flows and streamers seen in gas kinematics. By considering several possible orbits consistent with the observed arc, we show that all of the main observational features can be explained by one mechanism - the interaction between the disc and the observed binary companion. We find that the spirals, shadows, and horseshoe are only produced in the correct position angles by a companion on an inclined and eccentric orbit approaching periastron - the 'red' family from Lacour et al. Dust-gas simulations show radial and azimuthal concentration of dust around the cavity, consistent with the observed horseshoe. The success of this model in the HD 142527 disc suggests other mm-bright transition discs showing cavities, spirals, and dust asymmetries may also be explained by the interaction with central companions.
Universidad de Chile Pontificia Universidad Catolica de Chile Millenium Nucleus Australian Research Council FT13010034 DP130102078 DP180104235 Australian Government FONDECYT 3170680 Millenium Nucleus RC130007 Royal Society CONICYT-Chile through FONDECYT 1141175 CONICYT-Chile through Basal PFB0609
Artículo de publicación ISI
Quote ItemMNRAS 477, 1270–1284 (2018)
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