Article (Scientific journals)
Herschel's "Cold Debris Disks": Background Galaxies or Quiescent Rims of Planetary Systems?
Krivov, A. V.; Eiroa, C.; Löhne, T. et al.
2013In Astrophysical Journal, 772, p. 32
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Keywords :
Stars: individuals; Circumstellar matter; Planetary systems: formation; Planetary systems: protoplanetary disks; Galaxies: statistics
Abstract :
[en] (abridged) Infrared excesses associated with debris disk host stars detected so far peak at wavelengths around ~100µm or shorter. However, six out of 31 excess sources in the Herschel OTKP DUNES have been seen to show significant - and in some cases extended - excess emission at 160{\mu}m, which is larger than the 100{\mu}m excess. This excess emission has been suggested to stem from debris disks colder than those known previously. Using several methods, we re-consider whether some or even all of the candidates may be associated with unrelated galactic or extragalactic emission and conclude that it is highly unlikely that none of the candidates represents a true circumstellar disk. For true disks, both the dust temperatures inferred from the SEDs and the disk radii estimated from the images suggest that the dust is nearly as cold as a blackbody. This requires the grains to be larger than ~100{\mu}m, regardless of their material composition. To explain the dearth of small grains, we explore several conceivable scenarios: transport-dominated disks, disks of low dynamical excitation, and disks of unstirred primordial macroscopic grains. Our qualitative analysis and collisional simulations rule out the first two of these scenarios, but show the feasibility of the third one. We show that such disks can survive for gigayears, largely preserving the primordial size distribution. They should be composed of macroscopic solids larger than millimeters, but smaller than kilometers in size. Thus planetesimal formation, at least in the outer regions of the systems, has stopped before "cometary" or "asteroidal" sizes were reached.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Krivov, A. V.
Eiroa, C.
Löhne, T.
Marshall, J. P.
Montesinos, B.
del Burgo, C.
Absil, Olivier  ;  Université de Liège - ULiège
Ardila, D.
Augereau, J.-C.
Bayo, A.
Bryden, G.
Danchi, W.
Ertel, S.
Lebreton, J.
Liseau, R.
Mora, A.
Mustill, A. J.
Mutschke, H.
Neuhäuser, R.
Pilbratt, G. L.
Roberge, A.
Schmidt, T. O. B.
Stapelfeldt, K. R.
Thébault, Ph
Vitense, Ch
White, G. J.
Wolf, S.
More authors (17 more) Less
Language :
English
Title :
Herschel's "Cold Debris Disks": Background Galaxies or Quiescent Rims of Planetary Systems?
Publication date :
02 July 2013
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
IOP Publishing, Bristol, United Kingdom
Volume :
772
Pages :
32
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 13 June 2013

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