The beta Pictoris disk imaged by Herschel PACS and SPIRE
Artikel i vetenskaplig tidskrift, 2010

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.

individual: beta Pic

planet

stars

planetary systems

midinfrared images

collisions

debris discs

stars: early-type

dust disk

circumstellar matter

distributions

stars:

protoplanetary disks

Författare

B. Vandenbussche

KU Leuven

B. Sibthorpe

Royal Observatory

B. Acke

KU Leuven

E. Pantin

CNRS Centre National de la Recherche Scientifique

G. Olofsson

Stockholms universitet

C. Waelkens

KU Leuven

C. Dominik

Astronomical Institute Anton Pannekoek

Radboud Universiteit

M. J. Barlow

University College London (UCL)

Jadl Blommaert

KU Leuven

J. Bouwman

Max Planck-institutet

A. Brandeker

Stockholms universitet

M. Cohen

University of California

W. De Meester

KU Leuven

W. R. F. Dent

Atacama Large Millimeter-submillimeter Array

K. M. Exter

KU Leuven

J. Di Francesco

National Research Council Canada

M. Fridlund

Research and Scientific Support Department

W. K. Gear

Cardiff University

A. M. Glauser

Eidgenössische Technische Hochschule Zürich (ETH)

Royal Observatory

H. L. Gomez

Cardiff University

J. S. Greaves

University of St Andrews

P. C. Hargrave

Cardiff University

P. M. Harvey

The University of Texas at Austin

University of Colorado at Boulder

T. Henning

Max Planck-institutet

A. Heras

Research and Scientific Support Department

M. R. Hogerheijde

Universiteit Leiden

W. S. Holland

Royal Observatory

R. Huygen

KU Leuven

R. J. Ivison

Royal Observatory

University of Edinburgh

C. Jean

KU Leuven

S. J. Leeks

Rutherford Appleton Laboratory

T. L. Lim

Rutherford Appleton Laboratory

René Liseau

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

B. C. Matthews

National Research Council Canada

D. A. Naylor

University of Lethbridge

G.L. Pilbratt

Research and Scientific Support Department

E. T. Polehampton

Rutherford Appleton Laboratory

University of Lethbridge

S. Regibo

KU Leuven

P. Royer

KU Leuven

A. Sicilia-Aguilar

Max Planck-institutet

B. M. Swinyard

Rutherford Appleton Laboratory

H. Walker

Rutherford Appleton Laboratory

R. Wesson

University College London (UCL)

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 518 L133

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1051/0004-6361/201014626