Article (Scientific journals)
Herschel discovery of a new class of cold, faint debris discs
Eiroa, C.; Marshall, J. P.; Mora, A. et al.
2011In Astronomy and Astrophysics, 536, p. 4
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http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201117797&Itemid=129 Copyright ESO 2011, published by EDP Sciences


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Keywords :
circumstellar matter; planetary systems; stars: individual: αMen (HIP 29271); stars: individual: HD 88230 (HIP 49908); stars: individual: HD 210277 (HIP 109378)
Abstract :
[en] We present Herschel PACS 100 and 160 μm observations of the solar-type stars α Men, HD 88230 and HD 210277, which form part of the FGK stars sample of the Herschel open time key programme (OTKP) DUNES (DUst around NEarby Stars). Our observations show small infrared excesses at 160 μm for all three stars. HD 210277 also shows a small excess at 100 μm, while the 100 μm fluxes of α Men and HD 88230 agree with the stellar photospheric predictions. We attribute these infrared excesses to a new class of cold, faint debris discs. Both α Men and HD 88230 are spatially resolved in the PACS 160 μm images, while HD 210277 is point-like at that wavelength. The projected linear sizes of the extended emission lie in the range from ~115 to ≤ 250 AU. The estimated black body temperatures from the 100 and 160 μm fluxes are ≲22 K, and the fractional luminosity of the cold dust is L[SUB]dust[/SUB]/L[SUB] ⋆ [/SUB] ~ 10[SUP]-6[/SUP], close to the luminosity of the solar-system's Kuiper belt. These debris discs are the coldest and faintest discs discovered so far around mature stars, so they cannot be explained easily invoking "classical" debris disc models. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Eiroa, C.;  Dpt. Física Teórica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain
Marshall, J. P.;  Dpt. Física Teórica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain
Mora, A.;  ESA-ESAC Gaia SOC, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
Krivov, A. V.;  Astrophysikalisches Institut und Universitätssternwarte, Friedrich-Schiller-Universität, Schillergäßchen 2-3, 07745, Jena, Germany
Montesinos, B.;  Dpt. de Astrofísica, Centro de Astrobiología (INTA-CSIC), ESAC Campus, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
Absil, Olivier  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Ardila, D.;  NASA Herschel Science Center, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA, 91125, USA
Arévalo, M.;  Dpt. de Astrofísica, Centro de Astrobiología (INTA-CSIC), ESAC Campus, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
Augereau, J.-C.;  Université Joseph Fourier/CNRS, Laboratoire d'Astrophysique de Grenoble, UMR 5571, Grenoble, France
Bayo, A.;  European Space Observatory, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago 19, Chile
Danchi, W.;  NASA Goddard Space Flight Center, Exoplanets and Stellar Astrophysics, Code 667, Greenbelt, MD, 20771, USA
Del Burgo, C.;  UNINOVA-CA3, Campus da Caparica, Quinta da Torre, Monte de Caparica, 2825-149, Caparica, Portugal
Ertel, S.;  Christian-Albrechts-Universität zu Kiel, Institut für Theoretische Physik und Astrophysik, Leibnizstr. 15, 24098, Kiel, Germany
Fridlund, M.;  ESA Astrophysics & Fundamental Physics Missions Division, ESTEC/SRE-SA, Keplerlaan 1, 2201 AZ, Noordwijk, The Netherlands
González-García, B. M.;  INSA at ESAC, 28691 Villanueva de la Cañada, Madrid, Spain
Heras, A. M.;  ESA Astrophysics & Fundamental Physics Missions Division, ESTEC/SRE-SA, Keplerlaan 1, 2201 AZ, Noordwijk, The Netherlands
Lebreton, J.;  Université Joseph Fourier/CNRS, Laboratoire d'Astrophysique de Grenoble, UMR 5571, Grenoble, France
Liseau, R.;  Onsala Space Observatory, Chalmers University of Technology, 439 92, Onsala, Sweden
Maldonado, J.;  Dpt. Física Teórica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain
Meeus, G.;  Dpt. Física Teórica, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain
Montes, D.;  Universidad Complutense de Madrid, Facultad de Ciencias Físicas, Dpt. Astrofísica, Av. Complutense s/n, 28040, Madrid, Spain
Pilbratt, G. L.;  ESA Astrophysics & Fundamental Physics Missions Division, ESTEC/SRE-SA, Keplerlaan 1, 2201 AZ, Noordwijk, The Netherlands
Roberge, A.;  NASA Goddard Space Flight Center, Exoplanets and Stellar Astrophysics, Code 667, Greenbelt, MD, 20771, USA
Sanz-Forcada, J.;  Dpt. de Astrofísica, Centro de Astrobiología (INTA-CSIC), ESAC Campus, PO Box 78, 28691 Villanueva de la Cañada, Madrid, Spain
Stapelfeldt, K.;  Jet Propulsion Laboratory, California Institute of Technology, MS 183-900, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA
Thébault, P.;  LESIA, Observatoire de Paris, 92195, Meudon, France
White, G. J.;  Department of Physics and Astrophysics, Open University, Walton Hall, Milton Keynes, MK7 6AA, UK ; Rutherford Appleton Laboratory, Chilton, OX11 0QX, UK
Wolf, S.;  Christian-Albrechts-Universität zu Kiel, Institut für Theoretische Physik und Astrophysik, Leibnizstr. 15, 24098, Kiel, Germany
More authors (18 more) Less
Language :
English
Title :
Herschel discovery of a new class of cold, faint debris discs
Publication date :
01 December 2011
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
536
Pages :
L4
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
http://de.arxiv.org/abs/1110.4826
Available on ORBi :
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