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 A11

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.1051/0004-6361/201321050

More information

Latest update

7/9/2021 9