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Kuiper belts around...
Kuiper belts around nearby stars
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- Nilsson, Ricky, 1979- (författare)
- Stockholms universitet,Institutionen för astronomi,Stockholm University
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- Liseau, René, 1949 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Brandeker, Alexis (författare)
- Stockholms universitet,Institutionen för astronomi,Stockholm University
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- Olofsson, Göran (författare)
- Stockholms universitet,Institutionen för astronomi,Stockholm University
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- Pilbratt, Göran (författare)
- European Space Research and Technology Centre (ESA ESTEC)
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- Risacher, Christophe (författare)
- Netherlands Institute for Space Research (SRON)
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- Rodmann, Jens (författare)
- European Space Research and Technology Centre (ESA ESTEC)
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- Augereau, Jean-Charles (författare)
- Université Grenoble Alpes,Grenoble Alpes University
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- Bergman, Per, 1960 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Eiroa, Carlos (författare)
- Universidad Autonoma de Madrid (UAM)
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- Fridlund, Malcolm (författare)
- European Space Research and Technology Centre (ESA ESTEC)
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- Thébault, Philippe (författare)
- Observatoire de Paris-Meudon,Stockholms universitet,Stockholm University
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- White, Glenn (författare)
- Open University,STFC Rutherford Appleton Laboratory
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(creator_code:org_t)
- 2010-08-31
- 2010
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 518, s. A40-
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Abstract
Ämnesord
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- Context. The existence of dusty debris disks around a large fraction of solar type main-sequence stars, inferred from excess far-IR and submillimetre emission compared to that expected from stellar photospheres, suggests that leftover planetesimal belts analogous to the asteroid-and comet reservoirs of the solar system are common. Aims. Sensitive submillimetre observations are essential to detect and characterise cold extended dust originating from collisions of small bodies in disks, belts, or rings at Kuiper-belt distances (30-50 AU or beyond). Measurements of the flux densities at these wavelengths will extend existing IR photometry and permit more detailed modelling of the Rayleigh-Jeans tail of the disks spectral energy distribution (SED), effectively constraining dust properties and disk extensions. By observing stars spanning from a few up to several hundred Myr, the evolution of debris disks during crucial phases of planet formation can be studied. Methods. We observed 22 exo-Kuiper-belt candidates at 870 mu m, as part of a large programme with the LABOCA bolometer at the APEX telescope. Dust masses (or upper limits) were calculated from integrated 870 mu m fluxes, and fits to the SED of detected sources revealed the fractional dust luminosities f(dust), dust temperatures T(dust), and power-law exponents beta of the opacity law. Results. A total of 10 detections with at least 3 sigma significance were made, out of which five (HD95086, HD131835, HD161868, HD170773, and HD207129) have previously never been detected at submillimetre wavelengths. Three additional sources are marginally detected with > 2.5 sigma significance. The best-fit beta parameters all lie between 0.1 and 0.8, in agreement with previous results indicating the presence of significantly larger grains than those in the ISM. From our relatively small sample we estimate f(dust) proportional to t(-alpha), with a similar to 0.8-2.0, and identify an evolution of the characteristic radial dust distance R(dust) that is consistent with the t(1/3) increase predicted from models of self-stirred collisions in debris disks.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- circumstellar matter
- planetary systems
- planet formation
- Kuiper belt
- submillimeter observations
- Astronomy
- astronomi
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Nilsson, Ricky, ...
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Liseau, René, 19 ...
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Brandeker, Alexi ...
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Olofsson, Göran
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Pilbratt, Göran
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Risacher, Christ ...
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Rodmann, Jens
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Augereau, Jean-C ...
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Bergman, Per, 19 ...
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Eiroa, Carlos
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Fridlund, Malcol ...
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Thébault, Philip ...
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White, Glenn
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Stockholms universitet
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Chalmers tekniska högskola