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Title: RESOLVING THE MOTH AT MILLIMETER WAVELENGTHS

HD 61005, also known as ''The Moth'', is one of only a handful of debris disks that exhibit swept-back ''wings'' thought to be caused by interaction with the ambient interstellar medium (ISM). We present 1.3 mm Submillimeter Array observations of the debris disk around HD 61005 at a spatial resolution of 1.''9 that resolve the emission from large grains for the first time. The disk exhibits a double-peaked morphology at millimeter wavelengths, consistent with an optically thin ring viewed close to edge-on. To investigate the disk structure and the properties of the dust grains we simultaneously model the spatially resolved 1.3 mm visibilities and the unresolved spectral energy distribution (SED). The temperatures indicated by the SED are consistent with expected temperatures for grains close to the blowout size located at radii commensurate with the millimeter and scattered light data. We also perform a visibility-domain analysis of the spatial distribution of millimeter-wavelength flux, incorporating constraints on the disk geometry from scattered light imaging, and find suggestive evidence of wavelength-dependent structure. The millimeter-wavelength emission apparently originates predominantly from the thin ring component rather than tracing the ''wings'' observed in scattered light. The implied segregation of large dust grains in the ring ismore » consistent with an ISM-driven origin for the scattered light wings.« less
Authors:
; ; ;  [1] ;  [2] ; ;  [3]
  1. Department of Astronomy, University of California Berkeley, 601 Campbell Hall, Berkeley, CA 94720 (United States)
  2. Institute for Astronomy, University of Hawaii, Honolulu, HI 96822 (United States)
  3. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
Publication Date:
OSTI Identifier:
22133932
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 774; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BLOWOUTS; COSMIC DUST; EMISSION; ENERGY SPECTRA; INTERACTIONS; INTERSTELLAR GRAINS; LIMITING VALUES; MORPHOLOGY; SPATIAL DISTRIBUTION; SPATIAL RESOLUTION; VISIBILITY; VISIBLE RADIATION; WAVELENGTHS