The Disk Substructures at High Angular Resolution Project (DSHARP): IV. Characterizing substructures and interactions in disks around multiple star systems

Abstract

To characterize the substructures induced in protoplanetary disks by the interaction between stars in multiple systems, we study the $1.25$mm continuum and the ${}^{12}$CO$(J=2-1)$ spectral line emission of the triple systems HT Lup and AS 205, at scales of $\approx 5$au, as part of the 'Disk Substructures at High Angular Resolution Project' (DSHARP). In the continuum emission, we find two symmetric spiral arms in the disk around AS 205 N, with pitch angle of $14^{\circ }$, while the southern component AS 205 S, itself a spectroscopic binary, is surrounded by a compact inner disk and a bright ring at a radius of $34$au. The ${}^{12}$CO line exhibits clear signatures of tidal interactions, with spiral arms, extended arc-like emission, and high velocity gas, possible evidence of a recent close encounter between the disks in the AS 205 system, as these features are predicted by hydrodynamic simulations of fly-by encounters. In the HT Lup system, we detect continuum emission from all three components. The primary disk, HT Lup A, also shows two-armed symmetric spiral structure with a pitch angle of $4^{\circ }$, while HT Lup B and C, located at $25$ and $434$au in projected separation from HT Lup A, are barely resolved with $\sim 5$ and $\sim 10$au in diameter, respectively. The gas kinematics for the closest pair indicates a different sense of rotation for each disk, which could be explained by either a counter rotation of the two disks in different, close to parallel, planes, or by a projection effect of these disks with a close to $90^{\circ }$ misalignment between them.

15 pages, 10 figures, accepted to ApJ Letters

References in corpus (22)

• Protoplanetary Disk Structures in Ophiuchus
• An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
• Spiral Density Waves in a Young Protoplanetary Disk
• On the diversity and statistical properties of protostellar discs
• H2O and OH gas in the terrestrial planet-forming zones of protoplanetary disks
• A Triple Protostar System Formed via Fragmentation of a Gravitationally Unstable Disk
• The Disk Substructures at High Angular Resolution Project (DSHARP): III. Spiral Structures in the Millimeter Continuum of the Elias 27, IM Lup, and WaOph 6 Disks
• CO and dust properties in the TW Hya disk from high-resolution ALMA observations
• Physical properties of dusty protoplanetary disks in Lupus: evidence for viscous evolution?
• A VLT/NACO Survey for Triple and Quadruple Systems among Visual Pre-Main Sequence Binaries
• Influence of Stellar Multiplicity On Planet Formation. II. Planets Are Less Common in Multiple-Star Systems with Separations Smaller than 1500 AU
• Misaligned Disks in the Binary Protostar IRS 43
• Misaligned Protoplanetary Disks in a Young Binary System
• Spiral arms in the disk of HD 142527 from CO emission lines with ALMA
• A tidal encounter caught in the act: modelling a star-disc fly-by in the young RW Aurigae system
• Sizes of protoplanetary discs after star-disc encounters
• The VLTI / PIONIER near-infrared interferometric survey of southern T Tauri stars. I. First results
• ALMA Observations of the T Tauri Binary System AS 205: Evidence for Molecular Winds and/or Binary Interactions
• ALMA observations of a misaligned binary protoplanetary disk system in Orion
• Identification of new transitional disk candidates in Lupus with Herschel
• Strongly misaligned triple system in SR 24 revealed by ALMA
• Time-monitoring Observations of Br$\gamma$ Emission from Young Stars

Cited by in corpus (10)

• The Disk Substructures at High Angular Resolution Project (DSHARP): III. Spiral Structures in the Millimeter Continuum of the Elias 27, IM Lup, and WaOph 6 Disks
• Spiral arms in the proto-planetary disc HD100453 detected with ALMA: evidence for binary-disc interaction and a vertical temperature gradient
• Disks Around T Tauri Stars with SPHERE (DARTTS-S) II: Twenty-one new polarimetric images of young stellar disks
• Flybys in protoplanetary discs: II. Observational signatures
• Spiral arms and instability within the AFGL 4176 mm1 disc
• The temporal requirements of directly observing self-gravitating spiral waves in protoplanetary discs with ALMA
• An Inner Disk in the Large Gap of the Transition Disk SR 24S
• 2MASS J15491331-3539118: a new low-mass wide companion of the GQ Lup system
• A Tight Relation between Spiral Arm Pitch Angle and Protoplanetary Disk Mass
• NaCo polarimetric observations of Sz 91 transitional disk: a remarkable case of dust filtering