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We present multiple-epoch measurements of the size and surface brightness ofthe light echoes from supernova (SN) 2014J in the nearby starburst galaxy M82.Hubble Space Telescope (HST) ACS/WFC images were taken ~277 and ~416 days afterB-band maximum in the filters F475W, F606W, and F775W. Observations with HSTWFC3/UVIS images at epochs ~216 and ~365 days (Crotts 2015) are included for amore complete analysis. The images reveal the temporal evolution of at leasttwo major light-echo components. The first one exhibits a filled ring structurewith position-angle-dependent intensity. This radially extended, diffuse echoindicates the presence of an inhomogeneous interstellar dust cloud ranging from~100 pc to ~500 pc in the foreground of the SN. The second echo componentappears as an unresolved luminous quarter-circle arc centered on the SN. Thewavelength dependence of scattering measured in different dust componentssuggests that the dust producing the luminous arc favors smaller grain sizes,while that causing the diffuse light echo may have sizes similar to those ofthe Milky Way dust. Smaller grains can produce an optical depth consistent withthat along the supernova-Earth line of sight measured by previous studiesaround maximum light. Therefore, it is possible that the dust slab, from whichthe luminous arc arises, is also responsible for most of the extinction towardsSN 2014J. The optical depths determined from the Milky Way-like dust in thescattering matters are lower than that produced by the dust slab.

Interstellar-Medium Mapping in M82 Through Light Echoes Around Supernova 2014J