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Title: THE NEARBY, YOUNG, ISOLATED, DUSTY STAR HD 166191

We report an in-depth study of the F8-type star HD 166191, identified in an ongoing survey for stars exhibiting infrared emission above their expected photospheres in the Wide-field Infrared Survey Explorer all-sky catalog. The fractional IR luminosity measured from 3.5 to 70 μm is exceptionally high (L{sub IR}/L{sub bol} ∼ 10%). Near-diffraction-limited imaging observations with the T-ReCS Si filter set on the Gemini South telescope and adaptive optics imaging with the NIRC2 Lp filter on the Keck II telescope confirmed that the excess emission coincides with the star. Si-band images show a strong solid-state emission feature at ∼10 μm. Theoretical evolutionary isochrones and optical spectroscopic observations indicate a stellar age in the range 10-100 Myr. The large dust mass seen in HD 166191's terrestrial planet zone is indicative of a recent collision between planetary embryos or massive ongoing collisional grinding associated with planet building.
Authors:
; ;  [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. Department of Physics and Astronomy, University of Georgia, Athens, GA 30602 (United States)
  2. Center for Astrophysics and Space Sciences, University of California, San Diego, CA 92093 (United States)
  3. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States)
  4. Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT 2611 (Australia)
  5. Department of Astronomy, California Institute of Technology, Pasadena, CA 91125 (United States)
Publication Date:
OSTI Identifier:
22270647
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 777; 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; ASTRONOMY; ASTROPHYSICS; COSMIC DUST; DIFFRACTION; IMAGES; INFRARED SPECTRA; INFRARED SURVEYS; LUMINOSITY; PHOTOSPHERE; PLANETS; SILICON; STARS; TELESCOPES