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

Abstract

We present an analysis of ALMA 1.25 millimeter continuum observations of spiral structures in three protoplanetary disks from the Disk Substructures at High Angular Resolution Project. The disks around Elias 27, IM Lup, and WaOph 6 were observed at a resolution of $\sim 40-60$ mas ($\sim 6-7$ au). All three disks feature $m=2$ spiral patterns in conjunction with annular substructures. Gas kinematics established by ${}^{12}$CO $J=2-1$ observations indicate that the continuum spiral arms are trailing. The arm-interarm intensity contrasts are modest, typically less than 3. The Elias 27 spiral pattern extends throughout much of the disk, and the arms intersect the gap at $R\sim 69$ au. The spiral pattern in the IM Lup disk is particularly complex-it extends about halfway radially through the disk, exhibiting pitch angle variations with radius and interarm features that may be part of ring substructures or spiral arm branches. Spiral arms also extend most of the way through the WaOph 6 disk, but the source overall is much more compact than the other two disks. We discuss possible origins for the spiral structures, including gravitational instability and density waves induced by a stellar or planetary companion. Unlike the millimeter continuum counterparts of many of the disks with spiral arms detected in scattered light, these three sources do not feature high-contrast crescent-like asymmetries or large ($R>20$ au) emission cavities. This difference may point to multiple spiral formation mechanisms operating in disks.

19 pages, 9 figures, minor typos corrected

References in corpus (33)

• scikit-image: Image processing in Python
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• Protoplanetary Disk Structures in Ophiuchus
• X-Shooter spectroscopy of young stellar objects in Lupus: Accretion properties of class II and transitional objects
• Spiral Density Waves in a Young Protoplanetary Disk
• Asymmetric features in the protoplanetary disk MWC758
• Direct Imaging of Fine Structures in Giant Planet Forming Regions of the Protoplanetary Disk around AB Aurigae
• Three radial gaps in the disk of TW Hydrae imaged with SPHERE
• Shadows and spirals in the protoplanetary disk HD 100453
• A Millimeter Continuum Size-Luminosity Relationship for Protoplanetary Disks
• Variable protostellar accretion with episodic bursts
• Direct mapping of the temperature and velocity gradients in discs. Imaging the vertical CO snow line around IM Lupi
• Lupus disks with faint CO isotopologues: low gas/dust or large carbon depletion?
• Global Models for the Evolution of Embedded, Accreting Protostellar Disks
• The Coupled Physical Structure of Gas and Dust in the IM Lup Protoplanetary Disk
• Physical properties of dusty protoplanetary disks in Lupus: evidence for viscous evolution?
• The Disk Substructures at High Angular Resolution Project (DSHARP): IV. Characterizing substructures and interactions in disks around multiple star systems
• An ALMA Survey of CO isotopologue emission from Protoplanetary Disks in Chamaeleon I
• Spiral arms in the disk of HD 142527 from CO emission lines with ALMA
• Grand Design Spiral Arms in A Young Forming Circumstellar Disk
• Exploring dust around HD142527 down to 0.025" / 4au using SPHERE/ZIMPOL
• A tidal encounter caught in the act: modelling a star-disc fly-by in the young RW Aurigae system
• Dust-trapping vortices and a potentially planet-triggered spiral wake in the pre-transitional disk of V1247 Orionis
• Vortices and spirals in the HD135344B transition disk
• Variable dynamics in the inner disk of HD 135344B revealed with multi-epoch scattered light imaging
• SEEDS Adaptive Optics Imaging of the Asymmetric Transition Disk Oph IRS 48 in Scattered Light
• How to Detect the Signatures of Self-Gravitating Circumstellar Discs with the Atacama Large Millimetre/sub-millimetre Array
• Spiral arms in thermally stratified protoplanetary discs
• Planetary-like spirals caused by moving shadows in transition discs
• Spiral Structure and Differential Dust Size Distribution in the LkHa 330 Disk
• Searching for Gas-Rich Disks around T Tauri Stars in Lupus
• Gravitational instabilities in a protosolar-like disc II: continuum emission and mass estimates

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