ALMA Detection of Extended Millimeter Halos in the HD 32297 and HD 61005 Debris Disks

Abstract

We present ALMA 1.3 mm (230 GHz) observations of the HD 32297 and HD 61005 debris disks, two of the most iconic debris disks due to their dramatic swept-back wings seen in scattered light images. These observations achieve sensitivities of 14 and 13 $\mu$Jy beam${}^{-1}$ for HD 32297 and HD 61005, respectively, and provide the highest resolution images of these two systems at millimeter wavelengths to date. By adopting a MCMC modeling approach, we determine that both disks are best described by a two-component model consisting of a broad ($\Delta R/R>0.4$) planetesimal belt with a rising surface density gradient, and a steeply falling outer halo aligned with the scattered light disk. The inner and outer edges of the planetesimal belt are located at $78.5\pm 8.1$ AU and $122\pm 3$ AU for HD 32297, and $41.9\pm 0.9$ AU and $67.0\pm 0.5$ AU for HD 61005. The halos extend to $440\pm 32$ AU and $188\pm 8$ AU, respectively. We also detect ${}^{12}$CO J$=2-1$ gas emission from HD 32297 co-located with the dust continuum. These new ALMA images provide observational evidence that larger, millimeter-sized grains may also populate the extended halos of these two disks previously thought to only be composed of small, micron-sized grains. We discuss the implications of these results for potential shaping and sculpting mechanisms of asymmetric debris disks.

arXiv comment17 pages, 5 figures, published in ApJ

References in corpus (62)

• emcee: The MCMC Hammer
• The Gaia mission
• A giant planet imaged in the disk of the young star Beta Pictoris
• ALMA Survey of Lupus Protoplanetary Disks I: Dust and Gas Masses
• A probable giant planet imaged in the Beta Pictoris disk
• A planet on an inclined orbit as an explanation of the warp in the Beta Pictoris disk
• A Combined Subaru/VLT/MMT 1--5 Micron Study of Planets Orbiting HR 8799: Implications for Atmospheric Properties, Masses, and Formation
• The Debris Disk Around HR 8799
• LIME - a flexible, non-LTE line excitation and radiation transfer method for millimeter and far-infrared wavelengths
• Variations on Debris Disks: Icy Planet Formation at 30-150 AU for 1-3 Solar Mass Main Sequence Stars
• Molecular Gas Clumps from the Destruction of Icy Bodies in the $\beta$ Pictoris Debris Disk
• Probing for Exoplanets Hiding in Dusty Debris Disks: Disk Imaging, Characterization, and Exploration with HST/STIS Multi-Roll Coronagraphy
• Lupus disks with faint CO isotopologues: low gas/dust or large carbon depletion?
• Debris disc stirring by secular perturbations from giant planets
• Exocometary gas in the HD 181327 debris ring
• The Signature of Primordial Grain Growth in the Polarized Light of the AU Mic Debris Disk
• Predictions for the secondary CO, C and O gas content of debris discs from the destruction of volatile-rich planetesimals
• Opacity of fluffy dust aggregates
• ALMA observations of the molecular gas in the debris disk of the 30 Myr old star HD 21997
• Formation of sharp eccentric rings in debris disks with gas but without planets
• Debris from giant impacts between planetary embryos at large orbital radii
• Exocometary gas structure, origin and physical properties around $\beta$ Pictoris through ALMA CO multi-transition observations
• Millimeter Emission Structure in the first ALMA Image of the AU Mic Debris Disk
• Molecular gas in debris disks around young A-type stars
• A Complete ALMA Map of the Fomalhaut Debris Disk
• Azimuthal asymmetries in the debris disk around HD61005
• Braking the Gas in the beta Pictoris Disk
• Interstellar Medium Sculpting of the HD 32297 Disk
• A Trend Between Cold Debris Disk Temperature and Stellar Type: Implications for the Formation and Evolution of Wide-Orbit Planets
• Dusty Rings: Signposts of Recent Planet Formation
• Are debris disks self-stirred?
• Observations of Solids in Protoplanetary Disks
• A Primer on Unifying Debris Disk Morphologies
• Discovery of a Nearly Edge-On Disk Around HD 32297
• Radial Surface Density Profiles of Gas and Dust in the Debris Disk around 49 Ceti
• Modeling Self-Subtraction in Angular Differential Imaging: Application to the HD 32297 Debris Disk
• Detection of cool dust around the G2V star HD 107146
• First optical images of circumstellar dust surrounding the debris disk candidate HD 32297
• Widespread atomic gas emission reveals the rotation of the beta Pictoris disk
• ALMA observations of the debris disk around the young Solar Analog HD 107146
• Modeling the HD32297 Debris Disk with Far-IR Herschel Data
• Dissecting the Moth: Discovery of an off-centered ring in the HD 61005 debris disk with high-resolution imaging
• Gas Absorption Detected from the Edge-on Debris Disk Surrounding HD32297
• Does the Debris Disk around HD 32297 Contain Cometary Grains?
• Hubble Space Telescope Optical Imaging of the Eroding Debris Disk HD 61005
• Apocenter glow in eccentric debris disks: implications for Fomalhaut and epsilon Eridani
• Millimeter Imaging of the beta Pictoris Debris Disk: Evidence for a Planetesimal Belt
• Gas and dust around A-type stars at tens of Myr:signatures of cometary breakup
• The Epsilon Eridani System Resolved by Millimeter Interferometry
• Morphology of the very inclined debris disk around HD 32297
• Resolved Millimeter-Wavelength Observations of Debris Disks around Solar-Type Stars
• Resolved Millimeter Observations of the HR 8799 Debris Disk
• Bringing "The Moth" to Light: A Planet-Sculpting Scenario for the HD 61005 Debris Disk
• CARMA Millimeter-Wave Aperture Synthesis Imaging of the HD 32297 Debris Disk
• 12 and 18 micron images of dust surrounding HD 32297
• Keck/NIRC2 Imaging of the Warped, Asymmetric Debris Disk around HD 32297
• A Ring of Warm Dust in the HD 32297 Debris Disk
• Is the HD 15115 inner disk really asymmetrical ?
• Resolved Gas Interior to the Dust Rings of the HD 141569 Disk
• Grain Size segregation in debris discs
• Resolving The Moth at Millimeter Wavelengths
• Properties of interstellar wind leading to shape morphology of the dust surrounding HD 61005

Cited by in corpus (40)

• Solution to the debris disc mass problem: planetesimals are born small?
• Planet populations inferred from debris discs: insights from 178 debris systems in the ISPY, LEECH and LIStEN planet-hunting surveys
• Solar System Physics for Exoplanet Research
• Population synthesis of exocometary gas around A stars
• New millimeter CO observations of the gas-rich debris disks 49 Cet and HD 32297
• Multiple Rings of Millimeter Dust Emission in the HD 15115 Debris Disk
• The vertical structure of debris disks and the impact of gas
• Spatially resolved spectroscopy of the debris disk HD 32297: Further evidence of small dust grains
• The surprisingly low carbon mass in the debris disk around HD 32297
• Constraining planetesimal stirring: how sharp are debris disc edges?
• Dust Populations in the Iconic Vega Planetary System Resolved by ALMA
• Deprojecting and constraining the vertical thickness of exoKuiper belts
• Primordial or Secondary? Testing models of debris disk gas with ALMA
• The Gemini Planet Imager view of the HD 32297 debris disk
• The REASONS Survey: Resolved Millimeter Observations of a Large Debris Disk Around the Nearby F Star HD 170773
• Vertical evolution of exocometary gas: I. How vertical diffusion shortens the CO lifetime
• ALMA Images the Eccentric HD 53143 Debris Disk
• Extrasolar Kuiper Belts
• Stirred but not shaken: a multi-wavelength view of HD 16743's debris disc
• Giant Impacts and Debris Disk Morphology
• The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) II. The radial structure of debris discs
• Rave: A non-parametric method for recovering the surface brightness and height profiles of edge-on debris disks
• Dust Spreading in Debris Discs: Do Small Grains Cling on to Their Birth Environment?
• Emerging trends in metallicity and lithium properties of debris disc stars
• Revealing asymmetrical dust distribution in the inner regions of HD 141569
• Relating grain size distributions in circumstellar discs to the spectral index at millimetre wavelengths
• A re-investigation of debris disc halos
• The big sibling of AU Mic: a cold dust-rich debris disk around CP-72 2713 in the $\beta$ Pic moving group
• Sculpting eccentric debris disks with eccentric gas rings
• The ALMA survey to Resolve exoKuiper belt Substructures (ARKS): VI. Asymmetries and offsets
• Four new PLanetesimals Around TYpical and Pre-main seqUence Stars (PLATYPUS) Debris Discs at 8.8mm
• A Mixed Stirring Mechanism for Debris Discs with Giant and Dwarf Planetary Perturbations
• Characterization of debris disks observed with SPHERE
• Multi-wavelength, spatially resolved modelling of HD 48682's debris disc
• High Resolution ALMA Data of the Fomalhaut Debris Disk Confirms Apsidal Width Variation
• Abundance analysis of stars hosting gas-rich debris disks
• A Lopsided Outer Solar System
• Discovery of carbon monoxide emission from five debris disks around young A-type stars
• The Disks In Scorpius-Centaurus Survey (DISCS) I: Four Newly-Resolved Debris Disks in Polarized Intensity Light
• A Multi-Wavelength Study of the Highly Asymmetrical Debris Disk Around HD 111520