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HST/ACS Coronagraphic Imaging of the Circumstellar Disk around HD1415659A

M. Clampin, J. E. Krist, D. R. Ardila, D. A. Golimowski, G. F. Hartig, H. C. Ford, G. D. Illingworth, F. Bartko, N. Benitez, J. P. Blakeslee, R. J. Bouwens, T. J. Broadhurst, R. A. Brown, C. J. Burrows, E. S. Cheng, N. J. G. Cross, P. D. Feldman, M. Franx, C. Gronwall, L. Infante, R. A. Kimble, M. P. Lesser, A. R. Martel, F. Menanteau, G. R. Meurer, G. K. Miley, M. Postman, P. Rosati, M. Sirianni, W. B. Sparks, H. D. Tran, Z. I. Tsvetanov, R. L. White, W. Zheng

astro-pharXiv:astro-ph/0303605

Abstract

Multicolor coronagraphic images of the circumstellar disk around HD141569A have been obtained with the Hubble Space Telescope (HST) Advanced Camera for Surveys. B, V, and I images show that the disk's previously-described multiple-ring structure is actually a continuous distribution of dust with a tightly-wound spiral structure. Two, more open spiral arms extend from the disk, one of which appears to reach the nearby binary star HD141569BC. Diffuse dust is seen up to 1200AU from HD141569A. Although planets may exist in the inner region of the disk, tidal interaction with HD141569BC seems more likely to be the cause of these phenomena. The disk appears redder than the star (B-V = 0.21 and V-I = 0.25), and its color is spatially uniform. A scattering asymmetry factor of g = 0.25-0.35 is derived. The azimuthal density distribution is asymmetric, varying by a factor of ~3 at some radii.

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