Circumstellar Dust Created by Terrestrial Planet Formation in HD 113766
C. M. Lisse, C. H. Chen, M. C. Wyatt, and A. Morlok

TL;DR
This study analyzes warm, rocky, and icy dust in the HD 113766 system, suggesting ongoing planet formation processes with significant dust mass and replenishment mechanisms in a young binary star system.
Contribution
It provides detailed mineralogical and spatial characterization of circumstellar dust in a young system, linking dust composition to terrestrial planet formation.
Findings
Warm dust is located at ~1.8 AU, similar to the terrestrial zone.
Dust mass is at least 3 x 10^20 kg, comparable to a 320 km asteroid.
Persistent IR excess indicates continuous dust replenishment.
Abstract
We present an analysis of the gas-poor circumstellar material in the HD 113766 binary system (F3/F5, 10 - 16 Myr), recently observed by the Spitzer Space Telescope. For our study we have used the infrared mineralogical model derived from observations of the Deep Impact experiment. We find the dust dominated by warm, fine (~1 um) particles, abundant in Mg-rich olivine, crystalline pyroxenes, amorphous silicates, Fe-rich sulfides, amorphous carbon, and colder water-ice. The warm dust material mix is akin to an inner main belt asteroid of S-type composition. The ~440 K effective temperature of the warm dust implies that the bulk of the observed material is in a narrow belt ~1.8 AU from the 4.4 L_solar central source, in the terrestrial planet-forming region and habitable zone of the system (equivalent to 0.9 AU in the solar system). The icy dust lies in 2 belts, located at 4-9 AU and at 30…
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