The nearby, young, isolated, dusty star HD 166191

Abstract

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 $\mu$m is exceptionally high (L${}_{IR}$/L${}_{bol}$ $\sim$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 $\sim$10 $\mu$m. 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.

19 pages, 2 tables, 3 figures. Accepted to ApJ

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• Insights into planet formation from debris disks: II. Giant impacts in extrasolar planetary systems
• Variations on Debris Disks III. Collisional Cascades and Giant Impacts in the Terrestrial Zones of Solar-type Stars
• The transiting dust clumps in the evolved disk of the Sun-like UXor RZ Psc
• A new sample of warm extreme debris disks from the ALLWISE catalog
• A Star-sized Impact-Produced Dust Clump in the Terrestrial Zone of the HD 166191 System
• Debris Disks: Probing Planet Formation
• Highly structured inner planetary system debris around the intermediate age Sun-like star TYC 8830 410 1
• Faint warm debris disks around nearby bright stars explored by AKARI and IRSF
• Disks in Nearby Young Stellar Associations Found Via Virtual Reality
• Can the dustiest main sequence stars tell us about the rocky planet formation process?