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Title: Copious amounts of hot and cold dust orbiting the main sequence a-type stars HD 131488 and HD 121191

We report two new dramatically dusty main sequence stars: HD 131488 (A1 V) and HD 121191 (A8 V). HD 131488 is found to have substantial amounts of dust in its terrestrial planet zone (L {sub IR}/L {sub bol} ≈ 4 × 10{sup –3}), cooler dust farther out in its planetary system, and an unusual mid-infrared spectral feature. HD 121191 shows terrestrial planet zone dust (L {sub IR}/L {sub bol} ≈ 2.3 × 10{sup –3}), hints of cooler dust, and shares the unusual mid-infrared spectral shape identified in HD 131488. These two stars belong to sub-groups of the Scorpius-Centaurus OB association and have ages of ∼10 Myr. HD 131488 and HD 121191 are the dustiest main sequence A-type stars currently known. Early-type stars that host substantial inner planetary system dust are thus far found only within the age range of 5-20 Myr.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ; ;  [5]
  1. Center for Astrophysics and Space Sciences, University of California, San Diego, CA 92093-0424 (United States)
  2. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095-1547 (United States)
  3. Department of Physics and Astronomy, California State Polytechnic University, Pomona, 3801 West Temple Avenue, Pomona, CA 91768 (United States)
  4. Department of Physics and Astronomy, University of Georgia, Athens, GA 30602-2451 (United States)
  5. Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611 (Australia)
Publication Date:
OSTI Identifier:
22342041
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 778; 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; DUSTS; HEAT EXCHANGERS; MAIN SEQUENCE STARS; PLANETS; SATELLITES