Issue |
A&A
Volume 555, July 2013
|
|
---|---|---|
Article Number | A11 | |
Number of page(s) | 30 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/201321050 | |
Published online | 19 June 2013 |
DUst around NEarby Stars. The survey observational results⋆,⋆⋆,⋆⋆⋆,⋆⋆⋆⋆
1
Universidad Autónoma de Madrid, Dpto. Física Teórica, Módulo 15, Facultad
de Ciencias, Campus de
Cantoblanco, 28049
Madrid, Spain
2
ESA-ESAC Gaia SOC, PO Box 78, 28691
Villanueva de la Cañada,
Madrid,
Spain
3
Centro de Astrobiología (INTA-CSIC), ESAC Campus,
PO Box 78, 28691
Villanueva de la Cañada,
Madrid,
Spain
4
Institut d’Astrophysique et de Géophysique, Université de
Liège, 17 Allée du Six
Août, 4000
Sart Tilman,
Belgium
5
UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et
d’Astrophysique de Grenoble (IPAG), UMR 5274, 38041
Grenoble,
France
6
European Space Observatory, Alonso de Cordova 3107, Vitacura Casilla 19001,
Santiago 19,
Chile
7
Max-Planck Institut für Astronomie, 69117
Königstuhl,
Germany
8
Jet Propulsion Laboratory, California Institute of
Technology, 4800 Oak Grove
Drive, Pasadena,
CA
91109,
USA
9
NASA Goddard Space Flight Center, Exoplanets and Stellar
Astrophysics, Code 667, Greenbelt, MD
20771,
USA
10
Instituto Nacional de Astrofísica, Optica y Electrónica, Luis Enrique Erro 1,
Sta. Ma. Tonantzintla,
Puebla,
México
11
ESA Astrophysics & Fundamental Physics Missions
Division, ESTEC/SRE-SA, Keplerlaan
1, 2201 AZ
Noordwijk, The
Netherlands
12
Astrophysikalisches Institut und Universitätssternwarte,
Friedrich-Schiller-Universität, Schillergäßchen 2-3, 07745
Jena,
Germany
13
Department of Earth and Space Sciences, Chalmers University of
Technology, Onsala Space Observatory, SE-439 92
Onsala,
Sweden
14
Georg-August-Universität Göttingen, Institut für
Astrophysik, Friedrich-Hund-Platz
1, 37077
Göttingen,
Germany
15
LESIA, Observatoire de Paris, 92195
Meudon,
France
16
Christian-Albrechts-Universität zu Kiel, Institut für Theoretische
Physik und Astrophysik, Leibnizstr.
15, 24098
Kiel,
Germany
17
NASA Herschel Science Center, California Institute of
Technology, 1200 E. California
Blvd., Pasadena,
CA
91125,
USA
18
NASA ExoPlanet Science Institute, CaliforniaInstitute of
Technology, 1200 E. California
Blvd., Pasadena,
CA
91125,
USA
19
ISDEFE at ESAC, 28691
Villanueva de la Cañada,
Madrid,
Spain
20
Universidad Complutense de Madrid, Facultad de Ciencias
Físicas, Dpt. Astrofísica, av.
Complutense s/n, 28040
Madrid,
Spain
21
Department of Astronomy, Stockholm University, AlbaNova University
Center, Roslagstullsbacken
21, 106 91
Stockholm,
Sweden
22
Steward Observatory, University of Arizona,
933 North Cherry Avenue,
Tucson, AZ
85721,
USA
23
Rutherford Appleton Laboratory, Chilton
OX11 0QX,
UK
24
Department of Physics and Astrophysics, Open
University, Walton
Hall, Milton Keynes
MK7 6AA,
UK
25
Calar Alto Observatory, Centro Astronónomico
Hispano-Alemán, c/ Jesús Durbán
Remón, 2-2, 04004
Almería,
Spain
26
Nagoya University,
Japan
27
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117
Heidelberg,
Germany
28
Kapteyn Astronomical Institute, Postbus 800, 9700 AV
Groningen, The
Netherlands
29
Herschel Science Center, ESAC/ESA, PO Box 78, 28691
Villanueva de la Cañada,
Madrid,
Spain
30
Observatoire de la Côte d’Azur, Boulevard de
l’Observatoire, BP
4229, 06304
Nice Cedex 4,
France
31
Institute of Space and Astronautical Science (ISAS), Japan
Aerospace Exploration Agency (JAXA), 3-1-1, Yoshinodai, Chuo-ku, Sagamihara,
252-5210
Kanagawa,
Japan
32
Institut de Ciències de l’Espai (CSIC-IEEC), Campus UAB, Facultat
de Ciències, Torre C5, parell, 2a
pl., 08193 Bellaterra, Barcelona, Spain
33
ESA-ESAC, Science Archives Team, PO Box 78, 28691
Villanueva de la Cañada,
Madrid,
Spain
Received:
7
January
2013
Accepted:
26
April
2013
Context. Debris discs are a consequence of the planet formation process and constitute the fingerprints of planetesimal systems. Their solar system counterparts are the asteroid and Edgeworth-Kuiper belts.
Aims. The DUNES survey aims at detecting extra-solar analogues to the Edgeworth-Kuiper belt around solar-type stars, putting in this way the solar system into context. The survey allows us to address some questions related to the prevalence and properties of planetesimal systems.
Methods. We used Herschel/PACS to observe a sample of nearby FGK stars. Data at 100 and 160 μm were obtained, complemented in some cases with observations at 70 μm, and at 250, 350 and 500 μm using SPIRE. The observing strategy was to integrate as deep as possible at 100 μm to detect the stellar photosphere.
Results. Debris discs have been detected at a fractional luminosity level down to several times that of the Edgeworth-Kuiper belt. The incidence rate of discs around the DUNES stars is increased from a rate of ~12.1% ± 5% before Herschel to ~20.2% ± 2%. A significant fraction (~52%) of the discs are resolved, which represents an enormous step ahead from the previously known resolved discs. Some stars are associated with faint far-IR excesses attributed to a new class of cold discs. Although it cannot be excluded that these excesses are produced by coincidental alignment of background galaxies, statistical arguments suggest that at least some of them are true debris discs. Some discs display peculiar SEDs with spectral indexes in the 70–160 μm range steeper than the Rayleigh-Jeans one. An analysis of the debris disc parameters suggests that a decrease might exist of the mean black body radius from the F-type to the K-type stars. In addition, a weak trend is suggested for a correlation of disc sizes and an anticorrelation of disc temperatures with the stellar age.
Key words: circumstellar matter / planetary systems / infrared: stars
Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
Appendices are available in electronic form at http://www.aanda.org
Tables 14 and 15 are also available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/555/A11
Full Tables 2–5, 10 and 12 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/555/A11
© ESO, 2013
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