Discovery of an extended debris disk around the F2V star HD 15745 - AstrophysicsReportar como inadecuado

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Abstract: Using the Advanced Camera for Surveys aboard the Hubble Space Telescope, wehave discovered dust-scattered light from the debris disk surrounding the F2Vstar HD 15745. The circumstellar disk is detected between 2.0- and 7.5- radius,corresponding to 128 - 480 AU radius. The circumstellar disk morphology isasymmetric about the star, resembling a fan, and consistent with forwardscattering grains in an optically thin disk with an inclination of ~67 degreesto our line of sight. The spectral energy distribution and scattered lightmorphology can be approximated with a model disk composed of silicate grainsbetween 60 and 450 AU radius, with a total dust mass of 10E-7 M sun 0.03M earth representing a narrow grain size distribution 1 - 10 micron.Galactic space motions are similar to the Castor Moving Group with an age of~10E+8 yr, although future work is required to determine the age of HD 15745using other indicators.

Autor: Paul Kalas, Gaspard Duchene, Michael P. Fitzgerald, James R. Graham


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