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An ATCA Survey of Debris Disks at 7 Millimeters

Ricci, L. and Maddison, S. T. and Wilner, D. and MacGregor, M. A. and Ubach, C. and Carpenter, J. M. and Testi, L. (2015) An ATCA Survey of Debris Disks at 7 Millimeters. Astrophysical Journal, 813 (2). Art. No. 138. ISSN 0004-637X. doi:10.1088/0004-637X/813/2/138.

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We present Australia Telescope Compact Array continuum observations at a wavelength of 6.8 mm of five debris disks: β Pictoris, q^1 Eridani, HD 107146, HD 181327, and HD 95086. These observations provide the detection at the longest wavelengths obtained to date for all these debris disks. By combining our 6.8 mm data with previous detections at shorter sub-millimeter/millimeter wavelengths we measure the long wavelength spectral index of these sources. We then use previous estimates for the temperature of the emitting dust to derive the spectral index of the dust emissivity. Under the assumption that all the detected flux comes from dust only, we constrain the slope of the solid size distribution, assumed to be a power-law. The values that we infer for the slope of the size distribution range between about 3.36 and 3.50. We compare our findings with the case of the Fomalhaut debris disk and use these results to test the predictions of collisional cascades of planetesimal belts.

Item Type:Article
Related URLs:
URLURL TypeDescription
Wilner, D.0000-0003-1526-7587
Carpenter, J. M.0000-0003-2251-0602
Testi, L.0000-0003-1859-3070
Alternate Title:An Australia Telescope Compact Array Survey of Debris Disks at 7 Millimeters
Additional Information:© 2015. The American Astronomical Society. All rights reserved. Received 2015 September 4; accepted 2015 October 12; published 2015 November 9.
Subject Keywords:circumstellar matter; planets and satellites: formation; stars: individual (HD107146) ; submillimeter: stars
Issue or Number:2
Record Number:CaltechAUTHORS:20151218-122622309
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Official Citation:L. Ricci et al 2015 ApJ 813 138
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63083
Deposited By: George Porter
Deposited On:18 Dec 2015 23:33
Last Modified:10 Nov 2021 23:11

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