Signatures of broken protoplanetary discs in scattered light and in sub-millimetre observations

Abstract

Spatially resolved observations of protoplanetary discs are revealing that their inner regions can be warped or broken from the outer disc. A few mechanisms are known to lead to such 3D structures; among them, the interaction with a stellar companion. We perform a 3D SPH simulation of a circumbinary disc misaligned by $60^{\circ }$ with respect to the binary orbital plane. The inner disc breaks from the outer regions, precessing as a rigid body, and leading to a complex evolution. As the inner disc precesses, the misalignment angle between the inner and outer discs varies by more than $100^{\circ }$. Different snapshots of the evolution are post-processed with a radiative transfer code, in order to produce observational diagnostics of the process. Even though the simulation was produced for the specific case of a circumbinary disc, most of the observational predictions hold for any disc hosting a precessing inner rim. Synthetic scattered light observations show strong azimuthal asymmetries, where the pattern depends strongly on the misalignment angle between inner and outer disc. The asymmetric illumination of the outer disc leads to azimuthal variations of the temperature structure, in particular in the upper layers, where the cooling time is short. These variations are reflected in asymmetric surface brightness maps of optically thick lines, as CO $J$=3-2. The kinematical information obtained from the gas lines is unique in determining the disc structure. The combination of scattered light images and (sub-)mm lines can distinguish between radial inflow and misaligned inner disc scenarios.

17 pages, 17 figures. Accepted for publication in MNRAS

References in corpus (27)

• SPLASH: An interactive visualisation tool for Smoothed Particle Hydrodynamics simulations
• Ring shaped dust accumulation in transition disks
• A Three-Dimensional View of Turbulence: Constraints on Turbulent Motions in the HD 163296 Protoplanetary Disk using DCO${}^{+}$
• Shadows cast by a warp in the HD 142527 protoplanetary disk
• Shadows and spirals in the protoplanetary disk HD 100453
• Different dust and gas radial extents in protoplanetary disks: consistent models of grain growth and CO emission
• On the Bardeen-Petterson Effect in black hole accretion discs
• Warp diffusion in accretion discs: a numerical investigation
• On the origin of horseshoes in transitional discs
• Misaligned Disks in the Binary Protostar IRS 43
• Misaligned gas discs around eccentric black-hole binaries and implications for the final-parsec problem
• Polar alignment of a protoplanetary disk around an eccentric binary
• Chasing Shadows: Rotation of the Azimuthal Asymmetry in the TW Hya Disk
• A cavity and further radial substructures in the disk around HD~97048
• CSI 2264: Characterizing Young Stars in NGC 2264 with Short-Duration, Periodic Flux Dips in their Light Curves
• Inclination Evolution of Protoplanetary Disks Around Eccentric Binaries
• Tearing up a misaligned accretion disc with a binary companion
• Tidal Torques on Misaligned Disks in Binary Systems
• Resolved images of the protoplanetary disk around HD 100546 with ALMA
• Wind-driven Accretion in Transitional Protostellar Disks
• Violent environment of the inner disk of RW Aur A probed by the 2010 and 2015 dimming events
• Probing the presence of planets in transition discs' cavities via warps: the case of TW Hya
• Testing dust trapping in the circumbinary disk around GG Tau A
• Observational signatures of linear warps in circumbinary discs
• Spirals in protoplanetary disks from photon travel time
• Accretion disc viscosity: a limit on the anisotropy
• Structures in circumbinary disks: Prospects for observability

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• Scattered light shadows in warped protoplanetary discs
• A Tail Structure Associated with Protoplanetary Disk around SU Aurigae
• ALMA study of the HD 100453 AB system and the tidal interaction of the companion with the disk
• Planetary-like spirals caused by moving shadows in transition discs
• Flyby-induced misalignments in planet-hosting discs
• Rocking shadows in broken circumbinary discs
• Spirals, shadows & precession in HD 100453 -- II. The hidden companion
• SUBARU Near-Infrared Imaging Polarimetry of Misaligned Disks Around The SR24 Hierarchical Triple System
• Variability of the Great Disk Shadow in Serpens
• Time variability in the bipolar scattered light nebula of L1527 IRS: A possible warped inner disk
• High-Resolution Near-Infrared Polarimetry and Sub-Millimeter Imaging of FS Tau A: Possible Streamers in Misaligned Circumbinary Disk System
• Magnetorotational Instability in Diamagnetic, Misaligned Protostellar Discs