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Resolving the cold debris disc around a planet-hosting star. PACS photometric imaging observations of q1 Eridani (HD 10647, HR 506)

Liseau, René, 1949 (författare)
Chalmers University of Technology,Chalmers tekniska högskola
Eiroa, C. (författare)
Fedele, D. (författare)
Max Planck Society for the Advancement of Science (MPG), Germany,Johns Hopkins University, United States
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Augereau, J. C. (författare)
Grenoble Alpes University, France
Olofsson, G. (författare)
AlbaNova University Center. Stockholm Center for Physics, Astronomy and Biotechnology,Alba Nova Universitetscentrum
Gonzalez, B. (författare)
Maldonado, J. (författare)
Montesinos, B. (författare)
Centro de Astrobiologia (CAB), Spain
Mora, A. (författare)
Absil, O. (författare)
Ardila, D. R. (författare)
Spitzer Science Center, United States
Barrado, D. (författare)
Centro de Astrobiologia (CAB), Spain,California Institute of Technology (Caltech), USA
Bayo, A. (författare)
Centro de Astrobiologia (CAB), Spain,European Southern Observatory Santiago, Chile
Beichman, C. (författare)
Bryden, G. (författare)
Danchi, W. (författare)
del Burgo, C. (författare)
Ertel, S. (författare)
University of Kiel, Germany
Fridlund, C. W. M. (författare)
Heras, A. (författare)
Krivov, A. (författare)
Launhardt, R. (författare)
Max Planck Society for the Advancement of Science (MPG), Germany
Lebreton, J. (författare)
Grenoble Alpes University, France
Lohne, T. (författare)
Marshall, J. P. (författare)
Open University, United Kingdom
Meeus, G. (författare)
Muller, S. (författare)
Pilbratt, G.L. (författare)
Roberge, A. (författare)
Rodmann, J. (författare)
Solano, E. (författare)
Centro de Astrobiologia (CAB), Spain
Stapelfeldt, K. R. (författare)
Thebault, P. (författare)
White, G. J. (författare)
Open University, United Kingdom
Wolf, S. (författare)
University of Kiel, Germany
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Ingår i: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 518:Article Number: L132
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
  • Context. About two dozen exo-solar debris systems have been spatially resolved. These debris discs commonly display a variety of structural features such as clumps, rings, belts, excentric distributions and spiral patterns. In most cases, these features are believed to be formed, shaped and maintained by the dynamical influence of planets orbiting the host stars. In very few cases has the presence of the dynamically important planet(s) been inferred from direct observation. Aims. The solar-type star q(1) Eri is known to be surrounded by debris, extended on scales of less than or similar to 30 ''. The star is also known to host at least one planet, albeit on an orbit far too small to make it responsible for structures at distances of tens to hundreds of AU. The aim of the present investigation is twofold: to determine the optical and material properties of the debris and to infer the spatial distribution of the dust, which may hint at the presence of additional planets. Methods. The Photodetector Array Camera and Spectrometer (PACS) aboard the Herschel Space Observatory allows imaging observations in the far infrared at unprecedented resolution, i.e. at better than 6 '' to 12 '' over the wavelength range of 60 mu m to 210 mu m. Together with the results from ground-based observations, these spatially resolved data can be modelled to determine the nature of the debris and its evolution more reliably than what would be possible from unresolved data alone. Results. For the first time has the q(1) Eri disc been resolved at far infrared wavelengths. The PACS observations at 70 mu m, 100 mu m and 160 mu m reveal an oval image showing a disc-like structure in all bands, the size of which increases with wavelength. Assuming a circular shape yields the inclination of its equatorial plane with respect to that of the sky, i > 53 degrees. The results of image de-convolution indicate that i likely is larger than 63 degrees, where 90 degrees corresponds to an edge-on disc. Conclusions. The observed emission is thermal and optically thin. The resolved data are consistent with debris at temperatures below 30 K at radii larger than 120 AU. From image de-convolution, we find that q(1) Eri is surrounded by an about 40 AU wide ring at the radial distance of similar to 85 AU. This is the first real Edgeworth-Kuiper Belt analogue ever observed.


NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)


circumstellar matter
HIP 7978)
HR 506
stars: formation
stars: individual: q(1) Eri (HD 10647

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