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The beta Pictoris disk imaged by Herschel PACS and SPIRE
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2010 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 518, L133- p.Article in journal (Refereed) Published
Abstract [en]

We obtained Herschel PACS and SPIRE images of the thermal emission of the debris disk around the A5V star beta Pic. The disk is well resolved in the PACS filters at 70, 100, and 160 mu m. The surface brightness profiles between 70 and 160 mu m show no significant asymmetries along the disk, and are compatible with 90% of the emission between 70 and 160 mu m originating in a region closer than 200 AU to the star. Although only marginally resolving the debris disk, the maps obtained in the SPIRE 250-500 mu m filters provide full-disk photometry, completing the SED over a few octaves in wavelength that had been previously inaccessible. The small far-infrared spectral index (beta = 0.34) indicates that the grain size distribution in the inner disk (<200 AU) is inconsistent with a local collisional equilibrium. The size distribution is either modified by non-equilibrium effects, or exhibits a wavy pattern, caused by an under-abundance of impactors which have been removed by radiation pressure.

Place, publisher, year, edition, pages
2010. Vol. 518, L133- p.
Keyword [en]
stars: early-type, planetary systems, circumstellar matter, stars: individual: beta Pic
National Category
Natural Sciences
URN: urn:nbn:se:su:diva-51701DOI: 10.1051/0004-6361/201014626ISI: 000281527200134OAI: diva2:385715
authorCount :43Available from: 2011-01-12 Created: 2011-01-12 Last updated: 2011-01-12Bibliographically approved

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Olofsson, GöranBrandeker, Alexis
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Department of Astronomy
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