Issue |
A&A
Volume 518, July-August 2010
Herschel: the first science highlights
|
|
---|---|---|
Article Number | L131 | |
Number of page(s) | 5 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361/201014594 | |
Published online | 16 July 2010 |
Letter to the Editor
Cold DUst around NEarby Stars (DUNES). First results*
A resolved exo-Kuiper belt around the solar-like star ζ2 Ret
1
Dpt. Física Teórica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain e-mail: carlos.eiroa@uam.es
2
Max-Planck Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
3
John Hopkins University, Dept. of Physics and Astronomy, 3701 San Martin drive, Baltimore, MD 21210, USA
4
INSA at ESAC, 28691 Villanueva de la Cañada, Madrid, Spain
5
ESA Space Environment and Effects Section, ESTEC, PO Box 299, 2200 AG Noordwijk, The Netherlands
6
ESA Astrophysics & Fundamental Physics Missions Division, ESTEC/SRE-SA, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands
7
Université Joseph Fourier/CNRS, Laboratoire d'Astrophysique de Grenoble, UMR 5571, Grenoble, France
8
ESA-ESAC Gaia SOC. PO Box
78, 28691 Villanueva de la Cañada, Madrid, Spain
9
LAEX, Centro de Astrobiología (INTA-CSIC), LAEFF Campus, European Space Astronomy Center (ESAC), PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
10
NASA Herschel Science Center, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USA
11
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA
12
Onsala Space Observatory, Chalmers University of Technology, Se-439 92 Onsala, Sweden
13
European Space Observatory, Alonso de Cordova 3107, Vitacura Casilla 19001, Santiago 19, Chile
14
Institut d'Astrophysique et de Géophysique, Université de Liège, 17 Allée du Six Août, 4000 Sart Tilman, Belgium
15
NASA ExoPlanet Science Institute California Inst. of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USA
16
NASA Goddard Space Flight Center, Exoplanets and Stellar Astrophysics, Code 667, Greenbelt, MD 20771, USA
17
UNINOVA-CA3, Campus da Caparica, Quinta da Torre, Monte de Caparica,
2825-149 Caparica, Portugal
18
Christian-Albrechts-Universität zu Kiel, Institut für Theoretische Physik und Astrophysik, Leibnizstr. 15, 24098 Kiel, Germany
19
Nagoya University, Japan
20
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
21
Kapteyn Astronomical Institute, Postbus 800, 9700 AV Groningen, The Netherlands
22
Astrophysikalisches Institut und Universitätssternwarte, Friedrich-Schiller-Universität,
Schillergäßchen 2-3, 07745 Jena, Germany
23
Herschel Science Center, ESAC/ESA, PO BOX 78, 28691 Villanueva de la Cañada, Madrid, Spain
24
Department of Physics and Astrophysics, Open University, Walton Hall, Milton Keynes MK7 6AA, UK
25
Universidad Complutense de Madrid, Facultad de Ciencias Físicas, Dpt. Astrofísica, av. Complutense s/n. 28040 Madrid, Spain
26
Observatoire de la Côte d'Azur, Boulevard de l'Observatoire, BP 4229, 06304 Nice Cedex 4, France
27
Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 3-1-1, Yoshinodai, Sagamihara, Kanagawa, 229-8510, Japan
28
Department of Astronomy, Stockholm University, AlbaNova University Center, Roslagstullsbacken 21, 106 91 Stockholm, Sweden
29
Institut de Ciències de l'Espai (CSIC-IEEC), Campus UAB, Facultat de Ciències, Torre C5, parell, 2a pl., 08193 Bellaterra, Barcelona, Spain
30
LESIA, Observatoire de Paris, 92195 Meudon, France
31
Rutherford Appleton Laboratory, Chilton OX11 0QX, UK
Received:
31
March
2010
Accepted:
11
May
2010
We present the first far-IR observations of the solar-type stars δ Pav, HR 8501, 51 Peg and ζ2 Ret,
taken within the context of the DUNES Herschel open time key programme (OTKP). This project uses the PACS and SPIRE instruments with the objective of studying infrared excesses due to exo-Kuiper belts around nearby solar-type stars. The observed 100 μm fluxes from δ Pav, HR 8501, and 51 Peg agree with the predicted photospheric fluxes, excluding debris disks brighter than Ldust/ ~ 5 × 10-7 (1σ level) around those stars. A flattened, disk-like structure with a semi-major axis of ~100 AU in size is detected around ζ2 Ret. The resolved structure suggests the presence of an eccentric dust ring, which we interpret as an exo-Kuiper belt with
Ldust/
≈ 10-5.
Key words: stars: general / planetary system / space vehicles: instruments
© ESO, 2010
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