Browsing by Author "Price, Daniel J."

Now showing 1 - 5 of 5
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    Binary-induced spiral arms inside the disc cavity of AB Aurigae
    (2020) Poblete, Pedro P.; Calcino, Josh; Cuello, Nicolas; Macias, Enrique; Ribas, Alvaro; Price, Daniel J.; Cuadra, Jorge; Pinte, Christophe
    In this work we demonstrate that the inner spiral structure observed in AB Aurigae can be created by a binary star orbiting inside the dust cavity. We find that a companion with a mass-ratio of 0.25, semimajor axis of 40 au, eccentricity of 0.5, and inclination of 90 degrees produces gaseous spirals closely matching the ones observed in (CO)-C-12 (2-1) line emission. Based on dust dynamics in circumbinary discs (Poblete, Cuello & Cuadra 2019), we constrain the inclination of the binary with respect to the circumbinary disc to range between 60 degrees and 90 degrees. We predict that the stellar companion is located roughly 0.18 arcsec from the central star towards the east-southeast, above the plane of the disc. Should this companion be detected in the near future, our model indicates that it should be moving away from the primary star at a rate of 6 mas yr(-1) on the plane of the sky. Since our companion is inclined, we also predict that the spiral structure will appear to change with time, and not simply corotate with the companion.
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    Circumbinary, not transitional : on the spiral arms, cavity, shadows, fast radial flows, streamers, and horseshoe in the HD142527 disc
    (2018) Price, Daniel J.; Cuello, Nicolás; Pinte, Christophe; Mentiplay, Daniel; Casassus, Simon; Christiaens, Valentin; Kennedy, Grant M.; Cuadra Stipetich, Jorge Rodrigo; Pérez Rivera, Mario Sebástian; Marino, Sebastian
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    Flybys in protoplanetary discs : I. Gas and dust dynamics
    (2019) Cuello, Nicolás; Dipierro, Giovanni; Mentiplay, Daniel; Price, Daniel J.; Pinte, Christophe; Cuadra Stipetich, Jorge Rodrigo; Laibe, Guillaume; Ménard, Francois; Poblete, Pedro P.; Montesinos, Matías
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    Publisher note : circumbinary, not transitional: on the spiral arms, cavity, shadows, fast radial flows, streamers and horseshoe in the HD142527 disc
    (2018) Price, Daniel J.; Cuello, Nicolás; Pinte, Christophe; Mentiplay, Daniel; Casassus, Simon; Christiaens, Valentin; Kennedy, Grant M.; Cuadra Stipetich, Jorge Rodrigo; Perez, Sebastian; Marino, M. Sebastian
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    Signatures of an eccentric disc cavity: Dust and gas in IRS 48
    (2019) Calcino, Josh; Price, Daniel J.; Pinte, Christophe; van der Marel, Nienke; Ragusa, Enrico; Dipierro, Giovanni; Cuello, Nicolas; Christiaens, Valentin
    We test the hypothesis that the disc cavity in the 'transition disc' Oph IRS 48 is carved by an unseen binary companion. We use 3D dust-gas smoothed-particle hydrodynamics simulations to demonstrate that marginally coupled dust grains concentrate in the gas overdensity that forms in the cavity around a low binary mass ratio binary. This produces high contrast ratio dust asymmetries at the cavity edge similar to those observed in the disc around IRS 48 and other transition discs. This structure was previously assumed to be a vortex. However, we show that the observed velocity map of IRS 48 displays a peculiar asymmetry that is not predicted by the vortex hypothesis. We show the unusual kinematics are naturally explained by the non-Keplerian flow of gas in an eccentric circumbinary cavity. We further show that perturbations observed in the isovelocity curves of IRS 48 may be explained as the product of the dynamical interaction between the companion and the disc. The presence of an similar to 0.4 M-circle dot companion at an similar to 10 au separation can qualitatively explain these observations. High spatial resolution line and continuum imaging should be able to confirm this hypothesis.