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.
planet
stars: early-type
collisions
planetary systems
stars:
circumstellar matter
dust disk
individual: beta Pic
distributions
stars
debris discs
protoplanetary disks
midinfrared images
Författare
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. M. 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. Heras
M. R. Hogerheijde
W. S. Holland
R. Huygen
R. J. Ivison
C. Jean
S. J. Leeks
T. L. Lim
René Liseau
B. C. Matthews
D. A. Naylor
G.L. Pilbratt
E. T. Polehampton
S. Regibo
P. Royer
A. Sicilia-Aguilar
B. M. Swinyard
H. Walker
R. Wesson
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 518 Article Number: L133 L133Ämneskategorier (SSIF 2011)
Astronomi, astrofysik och kosmologi
DOI
10.1051/0004-6361/201014626