We present archival ALMA observations of the HD 141569 circumstellar disk at 345 , 230 , and 100 GHz .
These data detect extended millimeter emission that is exterior to the inner disk .
We find through simultaneous visibility modeling of all three data sets that the system ’ s morphology is described well by a two-component disk model .
The inner disk ranges from approximately 16 to 45 au with a spectral index of 1.81 ( q = 2.95 ) and the outer disk ranges from 95 to 300 au with a spectral index of 2.28 ( q = 3.21 ) .
Azimuthally averaged radial emission profiles derived from the continuum images at each frequency show potential emission that is consistent with the visibility modeling .
The analysis presented here shows that at \sim 5 Myr HD 141569 ’ s grain size distribution is steeper , and therefore more evolved , in the outer disk than in the inner disk .