Discovery of an extended debris disk around the F2V star HD 15745

Using the Advanced Camera for Surveys aboard the Hubble Space Telescope, we have discovered dust-scattered light from the debris disk surrounding the F2 V star HD 15745. The circumstellar disk is detected between 2.0 '' and 7.5 '' radius, corresponding to 128 - 480 AU radius. The circumstellar disk morphology is asymmetric about the star, resembling a fan, and consistent with forward scattering grains in an optically thin disk with an inclination of similar to 67 degrees to our line of sight. The spectral energy distribution and scattered light morphology can be approximated with a model disk composed of silicate grains between 60 and 450 AU radius, with a total dust mass of 10(-7) M-circle dot (0.03 M-circle plus), representing a narrow grain size distribution (1 - 10 mu m). Galactic space motions are similar to the Castor moving group, with an age of similar to 10(8) yr, although future work is required to determine the age of HD 15745 using other indicators.