CARMA Millimeter-Wave Aperture Synthesis Imaging of the HD 32297 Debris Disk

Abstract

We present the first detection and mapping of the HD 32297 debris disk at 1.3 mm with the Combined Array for Research in Millimeter-wave Astronomy (CARMA). With a sub-arcsecond beam, this detection represents the highest angular resolution (sub)mm debris disk observation made to date. Our model fits to the spectral energy distribution from the CARMA flux and new Spitzer MIPS photometry support the earlier suggestion that at least two, possibly three, distinct grain populations are traced by the current data. The observed millimeter map shows an asymmetry between the northeast and southwest disk lobes, suggesting large grains may be trapped in resonance with an unseen exoplanet. Alternatively, the observed morphology could result from the recent breakup of a massive planetesimal. A similar-scale asymmetry is also observed in scattered light but not in the mid-infrared. This contrast between asymmetry at short and long wavelengths and symmetry at intermediate wavelengths is in qualitative agreement with predictions of resonant debris disk models. With resolved observations in several bands spanning over three decades in wavelength, HD 32297 provides a unique testbed for theories of grain and planetary dynamics, and could potentially provide strong multi-wavelength evidence for an exoplanetary system.

4 pages, 4 figures; Accepted to ApJL: 25 Aug 2008

References in corpus (6)

• Nearby debris disk systems with high fractional luminosity reconsidered
• Collisional dust avalanches in debris discs
• On the observability of resonant structures in planetesimal disks due to planetary migration
• 12 and 18 micron images of dust surrounding HD 32297
• On the nature of clumps in debris disks
• A Ring of Warm Dust in the HD 32297 Debris Disk

Cited by in corpus (12)

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• Do Two Temperature Debris Disks Have Multiple Belts?
• Debris Disks in the Scorpius-Centaurus OB Association Resolved by ALMA
• Gas and dust around A-type stars at tens of Myr:signatures of cometary breakup
• ALMA Detection of Extended Millimeter Halos in the HD 32297 and HD 61005 Debris Disks
• The complex dust formation zone of the AGB star IRC+10216 probed with CARMA 0.25 arcsec angular resolution molecular observations
• A Resolved Ring of Debris Dust Around the Solar Analog HD 107146
• Circumstellar disks and planets. Science cases for next-generation optical/infrared long-baseline interferometers
• The Gemini Planet Imager view of the HD 32297 debris disk
• What Sets the Radial Locations of Warm Debris Disks?
• Resolved Millimeter Emission from the HD 15115 Debris Disk
• An Incipient Debris Disk in the Chamaeleon I Cloud