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Herschel images of ...
Herschel images of Fomalhaut An extrasolar Kuiper belt at the height of its dynamical activity
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- Acke, B. (author)
- Katholieke Universiteit Leuven,Stockholms universitet,Stockholm University
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- Min, M. (author)
- The University of Texas at Austin, USA,Universiteit Leiden (UL),Leiden University (UL),STFC Rutherford Appleton Laboratory
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- Dominik, C. (author)
- Anton Pannekoek Institute for Astronomy,Radboud Universiteit,Radboud University
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- Vandenbussche, B. (author)
- Katholieke Universiteit Leuven
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- Sibthorpe, B. (author)
- Royal Observatory
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- Waelkens, C. (author)
- Katholieke Universiteit Leuven
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- Olofsson, Göran, 1944- (author)
- Stockholms universitet,Institutionen för astronomi,Stockholm University
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- Degroote, P. (author)
- Katholieke Universiteit Leuven
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- Smolders, K. (author)
- Katholieke Universiteit Leuven
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- Pantin, E. (author)
- Centre national de la recherche scientifique (CNRS)
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- Barlow, M. J. (author)
- University College London (UCL)
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- Blommaert, Jadl (author)
- Katholieke Universiteit Leuven
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- Brandeker, Alexis (author)
- Stockholms universitet,Institutionen för astronomi
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- De Meester, W. (author)
- Katholieke Universiteit Leuven
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- Dent, W. R. F. (author)
- Atacama Large Millimeter-submillimeter Array (ALMA)
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- Exter, K. M. (author)
- Katholieke Universiteit Leuven
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- Di Francesco, J. (author)
- National Research Council Canada
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- Fridlund, M. (author)
- European Space Research and Technology Centre (ESA ESTEC)
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- Gear, W. K. (author)
- Cardiff University
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- Glauser, A. M. (author)
- Royal Observatory,Eidgenössische Technische Hochschule Zürich (ETH),Swiss Federal Institute of Technology in Zürich (ETH)
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- Greaves, J. S. (author)
- University of St Andrews
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- Harvey, P. M. (author)
- The University of Texas at Austin, USA
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- Henning, T. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Hogerheijde, M. R. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Holland, W. S. (author)
- Royal Observatory
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- Huygen, R. (author)
- Katholieke Universiteit Leuven
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- Ivison, R. J. (author)
- University of Edinburgh,Royal Observatory
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- Jean, C. (author)
- Katholieke Universiteit Leuven
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- Liseau, René, 1949 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Naylor, D. A. (author)
- University of Lethbridge
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- Pilbratt, G.L. (author)
- European Space Research and Technology Centre (ESA ESTEC)
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- Polehampton, E. T. (author)
- University of Lethbridge,STFC Rutherford Appleton Laboratory
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- Regibo, S. (author)
- Katholieke Universiteit Leuven
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- Royer, P. (author)
- Katholieke Universiteit Leuven
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- Sicilia-Aguilar, A. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),Universidad Autonoma de Madrid (UAM)
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- Swinyard, B. M. (author)
- STFC Rutherford Appleton Laboratory
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(creator_code:org_t)
- 2012-04-11
- 2012
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 540, s. Article Number: A125 -
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Abstract
Subject headings
Close
- Context. Fomalhaut is a young (2 +/- 1 x 10(8) years), nearby (7.7 pc), 2 M-circle dot star that is suspected to harbor an infant planetary system, interspersed with one or more belts of dusty debris. Aims. We present far-infrared images obtained with the Herschel Space Observatory with an angular resolution between 5.7 '' and 36.7 '' at wavelengths between 70 mu m and 500 mu m. The images show the main debris belt in great detail. Even at high spatial resolution, the belt appears smooth. The region in between the belt and the central star is not devoid of material; thermal emission is observed here as well. Also at the location of the star, excess emission is detected. We aim to construct a consistent image of the Fomalhaut system. Methods. We use a dynamical model together with radiative-transfer tools to derive the parameters of the debris disk. We include detailed models of the interaction of the dust grains with radiation, for both the radiation pressure and the temperature determination. Comparing these models to the spatially resolved temperature information contained in the images allows us to place strong constraints on the presence of grains that will be blown out of the system by radiation pressure. We use this to derive the dynamical parameters of the system. Results. The appearance of the belt points toward a remarkably active system in which dust grains are produced at a very high rate by a collisional cascade in a narrow region filled with dynamically excited planetesimals. Dust particles with sizes below the blow-out size are abundantly present. The equivalent of 2000 one-km-sized comets are destroyed every day, out of a cometary reservoir amounting to 110 Earth masses. From comparison of their scattering and thermal properties, we find evidence that the dust grains are fluffy aggregates, which indicates a cometary origin. The excess emission at the location of the star may be produced by hot dust with a range of temperatures, but may also be due to gaseous free-free emission from a stellar wind.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- stars
- evolution
- circumstellar matter
- dust
- spire instrument
- planetary system
- light
- radiation
- grains
- planetary systems
- debris disk
- small particles
- stars: individual: Fomalhaut
Publication and Content Type
- art (subject category)
- ref (subject category)
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To the university's database
- By the author/editor
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Acke, B.
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Min, M.
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Dominik, C.
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Vandenbussche, B ...
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Sibthorpe, B.
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Waelkens, C.
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show more...
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Olofsson, Göran, ...
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Degroote, P.
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Smolders, K.
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Pantin, E.
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Barlow, M. J.
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Blommaert, Jadl
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Brandeker, Alexi ...
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De Meester, W.
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Dent, W. R. F.
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Exter, K. M.
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Di Francesco, J.
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Fridlund, M.
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Gear, W. K.
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Glauser, A. M.
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Greaves, J. S.
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Harvey, P. M.
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Henning, T.
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Hogerheijde, M. ...
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Holland, W. S.
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Huygen, R.
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Ivison, R. J.
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Jean, C.
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Liseau, René, 19 ...
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Naylor, D. A.
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Pilbratt, G.L.
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Polehampton, E. ...
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Regibo, S.
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Royer, P.
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Sicilia-Aguilar, ...
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Swinyard, B. M.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
- Articles in the publication
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Astronomy and As ...
- By the university
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Chalmers University of Technology
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Stockholm University