DUst around NEarby Stars. The survey observational results
Journal article, 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 mu m were obtained, complemented in some cases with observations at 70 mu m, and at 250, 350 and 500 mu m using SPIRE. The observing strategy was to integrate as deep as possible at 100 mu m 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 similar to 12.1% +/- 5% before Herschel to similar to 20.2% +/- 2%. A significant fraction (similar to 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 mu m 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.
circumstellar matter
infrared: stars
planetary systems
Author
C. Eiroa
Universidad Autonoma de Madrid (UAM)
J. P. Marshall
Universidad Autonoma de Madrid (UAM)
A. Mora
B. Montesinos
Centro de Astrobiologia (CAB)
O. Absil
University of Liège
J. C. Augereau
Grenoble Alpes University
A. Bayo
European Space Observatory
Max Planck Society
G. Bryden
Jet Propulsion Laboratory, California Institute of Technology
W. Danchi
NASA Goddard Space Flight Center
C. del Burgo
National Institute of Astrophysics, Optics and Electronics
S. Ertel
Grenoble Alpes University
M. Fridlund
European Space Research and Technology Centre (ESA ESTEC)
A. Heras
European Space Research and Technology Centre (ESA ESTEC)
A. Krivov
Friedrich Schiller University Jena
R. Launhardt
Max Planck Society
René Liseau
Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics
T. Lohne
Friedrich Schiller University Jena
J. Maldonado
Universidad Autonoma de Madrid (UAM)
G.L. Pilbratt
European Space Research and Technology Centre (ESA ESTEC)
A. Roberge
NASA Goddard Space Flight Center
J. Rodmann
University of Göttingen
J. Sanz-Forcada
Centro de Astrobiologia (CAB)
E. Solano
Centro de Astrobiologia (CAB)
K. R. Stapelfeldt
NASA Goddard Space Flight Center
P. Thebault
Observatoire de Paris-Meudon
S. Wolf
University of Kiel
D. R. Ardila
California Institute of Technology (Caltech)
M. Arevalo
Centro de Astrobiologia (CAB)
European Space Astronomy Centre (ESAC)
C. Beichmann
California Institute of Technology (Caltech)
V. Faramaz
Grenoble Alpes University
B. M. Gonzalez-Garcia
European Space Astronomy Centre (ESAC)
R. Gutierrez
Centro de Astrobiologia (CAB)
J. Lebreton
Grenoble Alpes University
R. Martinez-Arnaiz
Complutense University
G. Meeus
Universidad Autonoma de Madrid (UAM)
D. Montes
Complutense University
G. Olofsson
Stockholm University
K. Y. L. Su
University of Arizona
G. J. White
Open University
STFC Rutherford Appleton Laboratory
D. Barrado
Centro de Astrobiologia (CAB)
Calar Alto Astronomical Observatory
M. Fukagawa
Nagoya University
E. Grun
Max Planck Society
I. Kamp
University of Groningen
R. Lorente
European Space Astronomy Centre (ESAC)
A. Morbidelli
Observatoire de la Cote d'Azur
S. Muller
Friedrich Schiller University Jena
H. Mutschke
Friedrich Schiller University Jena
T. Nakagawa
JAXA Institute of Space and Astronautical Science
I. Ribas
Universitat Autonoma de Barcelona (UAB)
H. Walker
Open University
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 555 A11Subject Categories
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/201321050