Multicolor coronagraphic images of the circumstellar disk around HD 141569A 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 HD 141569BC .
Diffuse dust is seen up to 1200 AU from HD 141569A .
Although planets may exist in the inner region of the disk , tidal interaction with HD 141569BC 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 \sim 3 at some radii .