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Far-infrared and sub-millimetre imaging of HD 76582's circumstellar disc

Marshall, Jonathan P., Booth, Mark, Holland, Wayne, Matthews, Brenda C., Greaves, Jane and Zuckerman, Ben 2016. Far-infrared and sub-millimetre imaging of HD 76582's circumstellar disc. Monthly Notices of the Royal Astronomical Society 459 (3) , pp. 2893-2904. 10.1093/mnras/stw813

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Abstract

Debris discs, 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 disc 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 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 disc 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 µm reveals a steep fall-off that we interpret as a disc dominated by moderately sized dust grains (amin = 36 µm), perhaps indicative of a non-steady-state collisional cascade within the disc. A disc architecture of three distinct annuli, comprising an unresolved component at 20 au and outer components at 80 and 270 au, along with a very steep particle size distribution (γ = 5), is proposed to match the observations.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 6 September 2017
Date of Acceptance: 5 April 2016
Last Modified: 06 Sep 2017 15:14
URI: http://orca-mwe.cf.ac.uk/id/eprint/104380

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