Herschel discovery of a new class of cold, faint debris discs

Carlos Eiroa (1) , J. P. Marshall (1) , A. Mora (2) , Alexander V. Krivov (3) , B. Montesinos (4) , Olivier Absil (5) , David Ardila (6) , M. Arévalo (4) , Jean-Charles Augereau (7) , Amelia Bayo (8) , William C. Danchi (9) , Carlos del Burgo (10) , Steve Ertel (11) , Malcolm C. Fridlund (12) , B. M. González-García (13) , A. M. Heras (12) , J. Lebreton (7) , René Liseau (14) , Jesús Maldonado (1) , Gwendolyn Meeus (1) , David Montes (15) , G. L. Pilbratt (12) , A. Roberge (9) , Jorge Sanz Forcada (4) , Karl R. Stapelfeldt (16) , Philippe Thébault (17, 18) , Glenn J. White (19) , Sebastian Wolf (11)

1 Departemento Física Teórica, Facultad de Ciencias, Universidad Autónoma de Madrid
2 ESA-ESAC Gaia SOC, PO Box 78
3 Astrophysikalisches Institut und Universitätssternwarte, Friedrich-Schiller-Universität Jena
4 Centro de Astrobiología LAEX (CSIC-INTA)
5 Institut d'Astrophysique, Géophysique et Océanographie, Université de Liège
6 NHSC - NASA Herschel Science Center, California Institute of Technology
7 LAOG - Laboratoire d'Astrophysique de Grenoble
8 European Southern Observatory
9 NASA Goddard Space Flight Center, Exoplanets and Stellar Astrophysics, Code 667, Greenbelt
10 UNINOVA-CA3 - Computational Intelligence Research Group
11 Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel
12 ESA Astrophysics & Fundamental Physics Missions Division, ESTEC/SRE-SA
13 INSA at European Space Astronomy Centre (ESAC), European Space Agency, Apartado de Correos 78
14 OSO - Onsala Space Observatory, Chalmers University of Technology
15 UCM - Universidad Complutense de Madrid = Complutense University of Madrid [Madrid]
16 JPL - Jet Propulsion Laboratory
17 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
18 Pôle Planétologie du LESIA
19 Department of Physics and Astronomy, The Open University

We present Herschel PACS 100 and 160 mum observations of the solar-type stars alpha 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 mum for all three stars. HD 210277 also shows a small excess at 100 mum, while the 100 mum fluxes of alpha 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 alpha Men and HD 88230 are spatially resolved in the PACS 160 mum 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

Domaines: Astrophysique [astro-ph]

Carlos Eiroa, J. P. Marshall, A. Mora, Alexander V. Krivov, B. Montesinos, et al.. Herschel discovery of a new class of cold, faint debris discs. Astronomy and Astrophysics - A&A, 2011, 536, pp.L4. ⟨10.1051/0004-6361/201117797⟩. ⟨hal-03732380⟩