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Fomalhaut debris disk emission at 7 millimeters: constraints on the collisional models of planetesimals

Ricci, L. and Testi, L. and Maddison, S. T. and Wilner, D. J. (2012) Fomalhaut debris disk emission at 7 millimeters: constraints on the collisional models of planetesimals. Astronomy and Astrophysics, 539 . Art. No. L6. ISSN 0004-6361. doi:10.1051/0004-6361/201118524. https://resolver.caltech.edu/CaltechAUTHORS:20120614-124712474

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Abstract

We present new spatially resolved observations of the dust thermal emission at 7 mm from the Fomalhaut debris disk obtained with the Australia Telescope Compact Array. These observations provide the longest wavelength detection of the Fomalhaut debris disk to date. We combined the new data to literature sub-mm data to investigate the spectral index of the dust thermal emission in the sub-millimeter and constrained the q-slope of the power-law grain size distribution. We derived a value for q = 3.48 ± 0.14 for grains with sizes around 1 mm. This is consistent with the classical prediction for a collisional cascade at the steady-state. The same value cannot be explained by more recent collisional models of planetesimals in which either the velocity distribution of the large bodies or their tensile strength is a strong function of the body size.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1051/0004-6361/201118524DOIArticle
ORCID:
AuthorORCID
Testi, L.0000-0003-1859-3070
Wilner, D. J.0000-0003-1526-7587
Additional Information:© 2012 ESO. Received 26 November 2011; Accepted 10 January 2012. Published online 24 February 2012. We thank the staff at Narrabri, ATNF.
Subject Keywords:submillimeter: planetary systems; circumstellar matter
DOI:10.1051/0004-6361/201118524
Record Number:CaltechAUTHORS:20120614-124712474
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120614-124712474
Official Citation:Fomalhaut debris disk emission at 7 millimeters: constraints on the collisional models of planetesimals L. Ricci, L. Testi, S. T. Maddison and D. J. Wilner A&A 539 L6 (2012) DOI: http://dx.doi.org/10.1051/0004-6361/201118524
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:31908
Collection:CaltechAUTHORS
Deposited By: Aucoeur Ngo
Deposited On:18 Jun 2012 14:54
Last Modified:09 Nov 2021 20:02

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