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

Eiroa, C. and Ardila, D. (2011) Herschel discovery of a new class of cold, faint debris discs. Astronomy and Astrophysics, 536 . Art. No. L4. ISSN 0004-6361.

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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_(dust)/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.

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Additional Information:© 2011 ESO. Received: 30 July 2011. Accepted: 19 October 2011. Published online 06 December 2011. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
Subject Keywords:circumstellar matter; planetary systems; stars: individual: α Men (HIP 29271); stars: individual: HD 88230 (HIP 49908); stars: individual: HD 210277 (HIP 109378)
Record Number:CaltechAUTHORS:20120215-085505393
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Official Citation:Herschel discovery of a new class of cold, faint debris discs L4 C. Eiroa et al. Published online: 6 December 2011 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29294
Deposited By: Ruth Sustaita
Deposited On:15 Feb 2012 17:10
Last Modified:03 Oct 2019 03:40

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