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We present new Hubble Space Telescope observations of three a priori knownstarlight-scattering circumstellar debris systems (CDSs) viewed at intermediateinclinations around nearby close-solar analog stars: HD 207129, HD 202628, andHD 202917. Each of these CDSs possesses ring-like components that aremore-massive analogs of our solar system's Edgeworth- Kuiper belt. Thesesystems were chosen for follow-up observations to provide higher-fidelity andbetter sensitivity imaging for the sparse sample of solar-analog CDSs thatrange over two decades in systemic ages with HD 202628 and HD 202917 (both ~2.3 Gyr) currently the oldest CDSs imaged in visible or near-IR light. Thesedeep (10 - 14 ksec) observations, with six-roll point-spread-function templatesubtracted visible-light coronagraphy using the Space Telescope ImagingSpectrograph, were designed to better reveal their angularly large, diffuse/lowsurface brightness, debris rings, and for all targets probe their exo-ringenvironments for starlight-scattering materials that present observationalchallenges for current ground-based facilities and instruments.Contemporaneously also observing with a narrower occulter position, theseobservations additionally probe the CDS endo-ring environments seen to berelatively devoid of scatterers. We discuss the morphological, geometrical, andphotometric properties of these CDSs also in the context of other FGK-starhosted CDSs we have previously imaged as a homogeneously observed ensemble.From this combined sample we report a general decay in quiescent diskF_disk/F_star optical brightness ~ t^-0.8, similar to what is seen in atthermal IR wavelengths, and CDSs with a significant diversity in scatteringphase asymmetries, and spatial distributions of their starlight-scatteringgrains.

Deep HST/STIS Visible-Light Imaging of Debris Systems around Solar Analog Hosts