Herschel Observations of Dusty Debris Disks

Abstract

We present results from two Herschel observing programs using the Photodetector Array Camera and Spectrometer. During three separate campaigns, we obtained Herschel data for 24 stars at 70, 100, and 160 microns. We chose stars that were already known or suspected to have circumstellar dust based on excess infrared emission previously measured with IRAS or Spitzer, and used Herschel to examine long-wavelength properties of the dust. Fifteen stars were found to be uncontaminated by background sources, and possess infrared emission most likely due to a circumstellar debris disk. We analyzed the properties of these debris disks to better understand the physical mechanisms responsible for dust production and removal. Seven targets were spatially resolved in the Herschel images. Based on fits to their spectral energy distributions, nine disks appear to have two temperature components. Of these nine, in three cases, the warmer dust component is likely the result of a transient process rather than a steady state collisional cascade. The dust belts at four stars are likely stirred by an unseen planet, and merit further investigation.

11 figures, 5 tables, Accepted to ApJ

References in corpus (17)

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Cited by in corpus (17)

• SONS: The JCMT legacy survey of debris discs in the submillimetre
• Molecular gas in debris disks around young A-type stars
• Solar System Physics for Exoplanet Research
• A Census of the Circumstellar Disk Populations in the Sco-Cen Complex
• Survey of planetesimal belts with ALMA: gas detected around the Sun-like star HD 129590
• A new sample of warm extreme debris disks from the ALLWISE catalog
• Primordial or Secondary? Testing models of debris disk gas with ALMA
• What Sets the Radial Locations of Warm Debris Disks?
• Stirred but not shaken: a multi-wavelength view of HD 16743's debris disc
• Highly structured inner planetary system debris around the intermediate age Sun-like star TYC 8830 410 1
• Studying the Evolution of Warm Dust Encircling BD +20 307 Using SOFIA
• Flybys in debris disk systems with Gaia eDR3
• A Mixed Stirring Mechanism for Debris Discs with Giant and Dwarf Planetary Perturbations
• Discovery of Volatile Gas in the Giant Impact Disk around the 150-Myr old HD 23514
• Abundant sub-micron grains revealed in newly discovered extreme debris discs
• V488 Per revisited: no strong mid-infrared emission features and no evidence for stellar/sub-stellar companions
• Discovery of carbon monoxide emission from five debris disks around young A-type stars