Debris discs at centimetre wavelengths: Planetesimal populations in young extrasolar Kuiper belts

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DOIResolve DOI: http://doi.org/10.1111/j.1745-3933.2012.01259.x
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TypeArticle
Journal titleMonthly Notices of the Royal Astronomical Society: Letters
ISSN1745-3933
Volume423
Issue1
PagesL70L74
AbstractTwo luminous debris discs around 100 Myr old have been searched for 1 cm dust emission, to a depth three times greater than in any such previous study. Very low limits were set towards both HD 377 and HD 104860 (noise levels of 12-14 μJy), extending the spectral range from 70 μm to 3mm where cool dust has previously been sought. The almost-identical fluxes of the two systems were merged into an average spectral energy distribution, which was then fitted using a distribution of grain sizes. The canonical infinite collisional cascade, with numbers of particles n(D)∝D -3.5 for diameter D, overpredicts the 1-cm flux, which should have been detected at over 3σ for the merged system. Preferred solutions have truncated grain populations with largest particles around 1.5-4mm in diameter, and slightly flatter distributions, up to n(D)∝D -3.1. The lack of cm-sized and larger particles is reminiscent of the similar deficit inferred around comets from spacecraft encounters. Such departures from simple power-law distributions of particles have been predicted in recent models where some size regimes are more readily broken up than others. A deficit of cm-scale particles can explain the fits we obtain, and reduces the total masses inferred for the comet belts of these stars. © 2012 The Authors. Monthly Notices of the Royal Astronomical Society. © 2012 RAS.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Herzberg Institute of Astrophysics (HIA-IHA)
Peer reviewedYes
NPARC number21269392
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Record identifiered05b845-0f81-4186-a829-69eb29a21aa7
Record created2013-12-12
Record modified2016-05-09
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