GW Ori: Interactions Between a Triple-star System and its Circumtriple Disk in Action

Abstract

GW Ori is a hierarchical triple system which has a rare circumtriple disk. We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of 1.3 mm dust continuum and 12CO J=2-1 molecular gas emission of the disk. For the first time, we identify three dust rings in the disk at ~46, 188, and 338 AU, with estimated dust mass of ~70-250 Earth masses, respectively. To our knowledge, the outer ring in GW Ori is the largest dust ring ever found in protoplanetary disks. We use visibility modelling of dust continuum to show that the disk has misaligned parts and the innermost dust ring is eccentric. The disk misalignment is also suggested by the CO kinematics modelling. We interpret these substructures as evidence of ongoing dynamical interactions between the triple stars and the circumtriple disk.

17 pages, 3+3 figures, 2 tables; accepted by ApJL on 2020-04-29

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• Early Planet Formation in Embedded Disks (eDisk) V: Possible Annular Substructure in a Circumstellar Disk in the Ced110 IRS4 System
• On the equations of warped disc dynamics
• Precession and polar alignment of accretion discs in triple (or multiple) stellar systems
• Dynamical dust traps in misaligned circumbinary discs: analytical theory and numerical simulations
• On the frequencies of circumbinary discs in protostellar systems
• Accretion onto a binary from a polar circumbinary disc
• Formation of polar circumstellar discs in binary star systems
• Intermediate mass T Tauri disk masses and a comparison to their Herbig disk descendants
• Assessing the spin-orbit obliquity of low-mass planets in the breaking the chain formation model: A story of misalignment
• Fast nodal precession of the disc around Pleione requires a broken disc
• Kozai-Lidov oscillations triggered by a tilt instability of detached circumplanetary discs
• Nonlinear behaviour of warped discs around a central object with a quadrupole moment