http://arxiv.org/abs/1604.08306
Debris disks, the tenuous rocky and icy remnants of planet formation, are believed to be evidence for planetary systems around other stars. The JCMT/SCUBA-2 debris disk legacy survey ‘SCUBA-2 Observations of Nearby Stars’ (SONS) observed 100 nearby stars, amongst them HD~76582, for evidence of such material. Here we present imaging observations by JCMT/SCUBA-2 and \textit{Herschel}/PACS at sub-millimetre and far-infrared wavelengths, respectively. We simultaneously model the ensemble of photometric and imaging data, spanning optical to sub-millimetre wavelengths, in a self-consistent manner. At far-infrared wavelengths, we find extended emission from the circumstellar disk providing a strong constraint on the dust spatial location in the outer system, although the angular resolution is too poor to constrain the interior of the system. In the sub-millimetre, photometry at 450 and 850~$\mu$m reveal a steep fall-off that we interpret as a disk dominated by moderately-sized dust grains ($a_{\rm min}~=~36~\mu$m), perhaps indicative of a non-steady-state collisional cascade within the disk. A disk architecture of three distinct annuli, comprising an unresolved component at $\sim$ 20 au and outer components at 80 and 270 au, along with a very steep particle size distribution ($\gamma~=~5$), is proposed to match the observations.
J. Marshall, M. Booth, W. Holland, et. al.
Fri, 29 Apr 16
18/57
Comments: 12 pages, 6 tables, 8 figures, accepted for publication in MNRAS