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HERSCHEL's "COLD DE...
HERSCHEL's "COLD DEBRIS DISKS": BACKGROUND GALAXIES OR QUIESCENT RIMS OF PLANETARY SYSTEMS?
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- Krivov, A. (författare)
- Friedrich-Schiller-Universität Jena,Friedrich Schiller University Jena
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- Eiroa, C. (författare)
- Universidad Autonoma de Madrid (UAM)
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- Lohne, T. (författare)
- Friedrich-Schiller-Universität Jena,Friedrich Schiller University Jena
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- Marshall, J. P. (författare)
- Universidad Autonoma de Madrid (UAM)
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- Montesinos, B. (författare)
- Centro de Astrobiologia (CAB)
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- del Burgo, C. (författare)
- Instituto Nacional de Astrofísica, Óptica y Electrońica (INAOE),National Institute of Astrophysics, Optics and Electronics (INAOE)
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- Absil, O. (författare)
- Universite de Liège,University of Liège
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- Ardila, D. R. (författare)
- California Institute of Technology (Caltech)
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- Augereau, J. C. (författare)
- Université Grenoble Alpes,Grenoble Alpes University
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- Bayo, A. (författare)
- European Southern Observatory Santiago,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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Bryden, G. (författare)
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- Danchi, W. (författare)
- NASA Goddard Space Flight Center
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- Ertel, S. (författare)
- Université Grenoble Alpes,Grenoble Alpes University
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- Lebreton, J. (författare)
- Université Grenoble Alpes,Grenoble Alpes University
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- Liseau, René, 1949 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Mora, A. (författare)
- European Space Astronomy Centre (ESAC)
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- Mustill, A. J. (författare)
- Universidad Autonoma de Madrid (UAM)
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- Mutschke, H. (författare)
- Friedrich-Schiller-Universität Jena,Friedrich Schiller University Jena
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- Neuhauser, R. (författare)
- Friedrich-Schiller-Universität Jena,Friedrich Schiller University Jena
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- Pilbratt, G.L. (författare)
- European Space Research and Technology Centre (ESA ESTEC)
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- Roberge, A. (författare)
- NASA Goddard Space Flight Center
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- Schmidt, T. O. B. (författare)
- Friedrich-Schiller-Universität Jena,Friedrich Schiller University Jena
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- Stapelfeldt, K. R. (författare)
- NASA Goddard Space Flight Center
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- Thebault, P. (författare)
- Observatoire de Paris-Meudon
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- Vitense, C. (författare)
- Friedrich-Schiller-Universität Jena,Friedrich Schiller University Jena
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- White, G. J. (författare)
- STFC Rutherford Appleton Laboratory,Open University
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- Wolf, S. (författare)
- Christian-Albrechts-Universität zu Kiel,University of Kiel
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(creator_code:org_t)
- 2013-07-02
- 2013
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 772:1
- Relaterad länk:
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https://repositorio....
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https://doi.org/10.1...
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https://research.cha...
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Abstract
Ämnesord
Stäng
- Infrared excesses associated with debris disk host stars detected so far peak at wavelengths around similar to 100 mu m or shorter. However, 6 out of 31 excess sources studied in the Herschel Open Time Key Programme, 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 attributed to circumstellar dust and has been suggested to stem from debris disks colder than those known previously. Since the excess emission of the cold disk candidates is extremely weak, challenging even the unrivaled sensitivity of Herschel, it is prudent to carefully consider whether some or even all of them may represent unrelated galactic or extragalactic emission, or even instrumental noise. We re-address these issues using several distinct methods 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 spectral energy distributions 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 similar to 100 mu m, even if they are rich in ices or are composed of any other material with a low absorption in the visible. The dearth of small grains is puzzling, since collisional models of debris disks predict that grains of all sizes down to several times the radiation pressure blowout limit should be present. 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 indeed survive for gigayears, largely preserving the primordial size distribution. They should be composed of macroscopic solids larger than millimeters, but smaller than a few kilometers in size. If larger planetesimals were present, then they would stir the disk, triggering a collisional cascade and thus causing production of small debris, which is not seen. Thus, planetesimal formation, at least in the outer regions of the systems, has stopped before "cometary" or "asteroidal" sizes were reached.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- HIP 73100)
- stars: individual (HIP 29271
- protoplanetary disks
- HIP 171
- planets and satellites: formation
- HIP 49908
- circumstellar matter
- HIP 92043
- galaxies: statistics
- HIP 109378
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
Hitta via bibliotek
Till lärosätets databas
- Av författaren/redakt...
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Krivov, A.
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Eiroa, C.
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Lohne, T.
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Marshall, J. P.
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Montesinos, B.
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del Burgo, C.
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visa fler...
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Absil, O.
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Ardila, D. R.
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Augereau, J. C.
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Bayo, A.
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Bryden, G.
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Danchi, W.
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Ertel, S.
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Lebreton, J.
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Liseau, René, 19 ...
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Mora, A.
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Mustill, A. J.
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Mutschke, H.
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Neuhauser, R.
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Pilbratt, G.L.
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Roberge, A.
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Schmidt, T. O. B ...
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Stapelfeldt, K. ...
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Thebault, P.
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Vitense, C.
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White, G. J.
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Wolf, S.
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