Herschel discovery of a new class of cold, faint debris discs
Author
Eiroa, Carlos; Marshall, Jonathan P.; Mora, Alcione; Krivov, Alexander V.; Absil, Olivier; Ardila, David R.; Arévalo, María Jesús; Augereau, Jean Charles; Bayo, Amelia; Danchi, William C.; Del Burgo, Carlos; Ertel, Steve; Fridlund, Malcolm C W; González-García, B. M.; Heras, Ana M.; Lebreton, Jean Pierre; Liseau, René; Maldonado, J.; Meeus, Gwendolyn; Pilbratt, Göran L.; Roberge, Aki; Sanz-Forcada, Jorge; Stapelfeldt, Karl R.; Thébault, Philippe; White, Glenn J.; Wolf, Sebastian; Montesinos, Benjamín; Montes, DavidEntity
UAM. Departamento de Física TeóricaPublisher
ESODate
2011-12-12Citation
10.1051/0004-6361/201117797
Astronomy and Astrophysics 536 (2011): L4
ISSN
0004-6361 (print); 1432-0746 (online)DOI
10.1051/0004-6361/201117797Editor's Version
http://dx.doi.org/10.1051/0004-6361/201117797Subjects
Circumstellar matter; Planetary systems; Stars: individual: HD 210277 (HIP 109378); Stars: individual: α men (HIP 29271); Stars: individual: HD 88230 (HIP 49908); FísicaNote
Astronomy and Astrophysics 536 (2011): L4 reproduced with permission from Astronomy & AstrophysicsRights
© 2011 ESOAbstract
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 S tars). 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 Ldust/L_ ∼ 10−6, 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
Files in this item
Google Scholar:Eiroa, Carlos
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Marshall, Jonathan P.
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Mora, Alcione
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Krivov, Alexander V.
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Absil, Olivier
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Ardila, David R.
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Arévalo, María Jesús
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Augereau, Jean Charles
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Bayo, Amelia
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Danchi, William C.
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Del Burgo, Carlos
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Ertel, Steve
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Fridlund, Malcolm C W
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González-García, B. M.
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Heras, Ana M.
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Lebreton, Jean Pierre
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Liseau, René
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Maldonado, J.
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Meeus, Gwendolyn
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Pilbratt, Göran L.
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Roberge, Aki
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Sanz-Forcada, Jorge
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Stapelfeldt, Karl R.
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Thébault, Philippe
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White, Glenn J.
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Wolf, Sebastian
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Montesinos, Benjamín
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Montes, David
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