ALMA Reveals a Misaligned Inner Gas Disk inside the Large Cavity of a Transitional Disk

Abstract

Pairs of azimuthal intensity decrements at near symmetric locations have been seen in a number of protoplanetary disks. They are most commonly interpreted as the two shadows cast by a highly misaligned inner disk. Direct evidence of such an inner disk, however, remain largely illusive, except in rare cases. In 2012, a pair of such shadows were discovered in scattered light observations of the near face-on disk around 2MASS J16042165-2130284, a transitional object with a cavity $\sim$60 AU in radius. The star itself is a `dipper', with quasi-periodic dimming events on its light curve, commonly hypothesized as caused by extinctions by transiting dusty structures in the inner disk. Here, we report the detection of a gas disk inside the cavity using ALMA observations with $\sim 0$\farcs2 angular resolution. A twisted butterfly pattern is found in the moment 1 map of CO (3-2) emission line towards the center, which is the key signature of a high misalignment between the inner and outer disks. In addition, the counterparts of the shadows are seen in both dust continuum emission and gas emission maps, consistent with these regions being cooler than their surroundings. Our findings strongly support the hypothesized misaligned-inner-disk origin of the shadows in the J1604-2130 disk. Finally, the inclination of inner disk would be close to -45 ${}^{\circ }$ in contrast with 45 ${}^{\circ }$; it is possible that its internal asymmetric structures cause the variations on the light curve of the host star.

arXiv comment24 pages, 4 figures, accepted for publication in ApJL

References in corpus (47)

• First Results from High Angular Resolution ALMA Observations Toward the HL Tau Region
• Planet-disk interaction and orbital evolution
• A Major Asymmetric Dust Trap in a Transition Disk
• A Revised Age for Upper Scorpius and The Star-Formation History Among the F-Type Members of the Scorpius-Centaurus OB Association
• On the Submillimeter Opacity of Protoplanetary Disks
• Discovery of Small-Scale Spiral Structures in the Disk of SAO 206462 (HD 135344B): Implications for the Physical State of the Disk from Spiral Density Wave Theory
• Observations of gas flows inside a protoplanetary gap
• Evidence for Mass-dependent Circumstellar Disk Evolution in the 5 Myr-old Upper Scorpius OB Association
• Observational Signatures of Planets in Protoplanetary Disks I: Gaps Opened by Single and Multiple Young Planets in Disks
• Shadows cast by a warp in the HD 142527 protoplanetary disk
• Direct Imaging of Fine Structures in Giant Planet Forming Regions of the Protoplanetary Disk around AB Aurigae
• Structures in the protoplanetary disk of HD142527 seen in polarized scattered light
• Observational Signatures of Planets in Protoplanetary Disks II: Spiral Arms Observed in Scattered Light Imaging Can be Induced by Planets
• Shadows and spirals in the protoplanetary disk HD 100453
• Circumbinary, not transitional: On the spiral arms, cavity, shadows, fast radial flows, streamers and horseshoe in the HD142527 disc
• A Likely Close-In Low-Mass Stellar Companion to the Transitional Disk Star HD 142527
• Polarimetric Imaging of Large Cavity Structures in the Pre-transitional Protoplanetary Disk around PDS 70: Observations of the disk
• Resolving the HD 100546 Protoplanetary System with the Gemini Planet Imager: Evidence for Multiple Forming, Accreting Planets
• Discovery of a Disk Gap Candidate at 20 AU in TW Hydrae
• Young "Dipper" Stars in Upper Sco and $\rho$ Oph Observed by K2
• Discovery of H-alpha Emission from the Close Companion Inside the Gap of Transitional Disk HD142527
• Accretion kinematics through the warped transition disk in HD142527 from resolved CO(6-5) observations
• What is the Mass of a Gap-Opening Planet?
• Signatures of broken protoplanetary discs in scattered light and in sub-millimetre observations
• Subaru Imaging of Asymmetric Features in a Transitional Disk in Upper Scorpius
• A compact concentration of large grains in the HD142527 protoplanetary dust trap
• A cavity and further radial substructures in the disk around HD~97048
• A Gap with a Deficit of Large Grains in the protoplanetary disk around TW Hya
• An inner warp in the DoAr 44 T Tauri transition disk
• An M-dwarf star in the transition disk of Herbig HD 142527; Physical parameters and orbital elements
• The dynamically disrupted gap in HD 142527
• Near-Infrared Imaging Polarimetry of HD142527
• Fast Radial Flows in Transition Disk Holes
• Comparison of the dust and gas radial structure in the transition disk [PZ99] J160421.7-213028
• How Bright are Planet-Induced Spiral Arms in Scattered Light?
• 870 micron Imaging of a Transitional Disk in Upper Scorpius: Holdover from the Era of Giant Planet Formation?
• The Sizes and Depletions of the Dust and Gas Cavities in the Transitional Disk J160421.7-213028
• CO emission tracing a warp or radial flow within $\lesssim$ 100 au in the HD 100546 protoplanetary disk
• Spitzer Spectroscopy of Circumstellar Disks in the 5 Myr Old Upper Scorpius OB Association
• Connecting the shadows: probing inner disk geometries using shadows in transitional disks
• Variability and dust filtration in the transition disk J160421.7-213028 observed in optical scattered light
• Dipper disks not inclined towards edge-on orbits
• Polarized Light Imaging of the HD 142527 Transition Disk with the Gemini Planet Imager: Dust around the Close-in Companion
• Significant Gas-to-Dust Ratio Asymmetry and Variation in the Disk of HD 142527 and the Indication of Gas Depletion
• Resolved observations of transition disks
• Observational signatures of linear warps in circumbinary discs
• Unlocking the secrets of the midplane gas and dust distribution in the young hybrid disc HD 141569

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• Dust depleted inner disks in a large sample of transition disks through long-baseline ALMA observations
• On the diversity of asymmetries in gapped protoplanetary disks
• Perturbers: SPHERE detection limits to planetary-mass companions in protoplanetary disks
• Are Inner Disc Misalignments Common? ALMA Reveals an Isotropic Outer Disc Inclination Distribution for Young Dipper Stars
• Transition disks: the observational revolution from SEDs to imaging
• Kinematics and brightness temperatures of transition discs -- A survey of gas substructures as seen with ALMA
• Origin of Misalignments: Protostellar Jet, Outflow, Circumstellar Disc, and Magnetic Field
• A kinematically detected planet candidate in a transition disk
• exoALMA IV: Substructures, Asymmetries, and the Faint Outer Disk in Continuum Emission
• Time-resolved photometry of the young dipper RX J1604.3-2130A: Unveiling the structure and mass transport through the innermost disk
• Observational Signatures of Planets in Protoplanetary Disks: Planet-Induced Line Broadening in Gaps
• Rocking shadows in broken circumbinary discs
• The ALMA view of MP Mus (PDS 66): a protoplanetary disk with no visible gaps down to 4 au scales
• Cooling in the shade of warped transition disks
• ALMA Band 6 high-resolution observations of the transitional disk around SY Cha
• Planetesimals Around Stars with TESS (PAST): I. Transient Dimming of a Binary Solar Analog at the End of the Planet Accretion Era
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• First sub-arcsecond submillimeter-wave [C I] image of 49 Ceti with ALMA
• An asymmetric dust ring around a very low mass star ZZ Tau IRS
• Centrifugal barriers in magnetospheric accretion
• SUBARU Near-Infrared Imaging Polarimetry of Misaligned Disks Around The SR24 Hierarchical Triple System
• Kinematical signatures: Distinguishing between warps and radial flows
• Wavelength-Dependent Extinction and Grain Sizes in Dippers
• Multi-band reflectance and shadowing of RX J1604.3-2130 protoplanetary disk in scattered light
• Warps survive beyond fly-by encounters in protoplanetary disks. RW Aur A as a case study
• Resolving the large exoKuiper belt of the HD 126062 debris disc and extended gas emission in its vicinity