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We report here time domain infrared spectroscopy and optical photometry ofthe HD145263 silica-rich circumstellar disk system taken from 2003 through2014. We find an F4V host star surrounded by a stable, massive 1e22 - 1e23 kg(M_Moon to M_Mars) dust disk. No disk gas was detected, and the primary starwas seen rotating with a rapid ~1.75 day period. After resolving a problem withpreviously reported observations, we find the silica, Mg-olivine, andFe-pyroxene mineralogy of the dust disk to be stable throughout, and veryunusual compared to the ferromagnesian silicates typically found in primordialand debris disks. By comparison with mid-infrared spectral features ofprimitive solar system dust, we explore the possibility that HD 145263'scircumstellar dust mineralogy occurred with preferential destruction ofFe-bearing olivines, metal sulfides, and water ice in an initially comet-likemineral mix and their replacement by Fe-bearing pyroxenes, amorphous pyroxene,and silica. We reject models based on vaporizing optical stellar megaflares,aqueous alteration, or giant hypervelocity impacts as unable to produce theobserved mineralogy. Scenarios involving unusually high Si abundances are atodds with the normal stellar absorption near-infrared feature strengths for Mg,Fe, and Si. Models involving intense space weathering of a thin surface patinavia moderate (T < 1300 K) heating and energetic ion sputtering due to a stellarsuperflare from the F4V primary are consistent with the observations. The spaceweathered patina should be reddened, contain copious amounts of nanophase Fe,and should be transient on timescales of decades unless replenished.

HD 145263: Spectral Observations of Silica Debris Disk Formation via Extreme Space Weathering?