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The beta Pictoris disk imaged by Herschel PACS and SPIRE

B. Vandenbussche ; B. Sibthorpe ; B. Acke ; E. Pantin ; G. Olofsson ; C. Waelkens ; C. Dominik ; M. J. Barlow ; Jadl Blommaert ; J. Bouwman ; A. Brandeker ; M. Cohen ; W. De Meester ; W. R. F. Dent ; K. Exter ; J. Di Francesco ; M. Fridlund ; W. K. Gear ; A. M. Glauser ; H. L. Gomez ; J. S. Greaves ; P. C. Hargrave ; P. M. Harvey ; T. Henning ; A. M. Heras ; M. R. Hogerheijde ; W. S. Holland ; R. Huygen ; R. J. Ivison ; C. Jean ; S. J. Leeks ; T. L. Lim ; René Liseau (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; B. C. Matthews ; D. A. Naylor ; G. L. Pilbratt ; E. T. Polehampton ; S. Regibo ; P. Royer ; A. Sicilia-Aguilar ; B. M. Swinyard ; H. J. Walker ; R. Wesson
Astronomy & Astrophysics (0004-6361). Vol. 518 (2010), Article Number: L133 ,
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: stars: early-type, planetary systems, circumstellar matter, stars:, individual: beta Pic, protoplanetary disks, midinfrared images, debris discs, dust disk, distributions, collisions, planet, stars



Denna post skapades 2010-12-08. Senast ändrad 2011-03-30.
CPL Pubid: 130353

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik (2010-2017)

Ämnesområden

Astronomi, astrofysik och kosmologi

Chalmers infrastruktur