Abstract

AbstractIn this conference proceedings we summarize the key observational findings of the Herschel DUNES survey. We found 31 discs in our sample, equating to an increased dust incidence with Herschel of 20.2 ±2.0% compared to previous measurement of ~12.5±5% with Spitzer for the same population of nearby, Sun-like stars. We identify no trend towards fewer discs around later spectral types, as had previously been reported for A-M stars. Around half of the discs exhibit extended emission, representing a vast improvement in the number of spatially resolved debris discs and thereby the quality of modelling that can be applied to those systems. We also identify unusual sub-groups of discs, including ‘steep SED’ sources with dust spectral indexes in the 70–160 μm range, steeper than the Rayleigh-Jeans tail which, whilst not unheard of, are more typically seen at sub-mm wavelengths and candidate ‘cold discs’ which are identified through their lack of significant excess emission at wavelengths shorter than 100 μm.

Highlights

  • Circumstellar dust around mature main sequence stars is a marker for the occurence of a planet(esimal) formation process because the dust we observe, being shorter lived than the star it orbits, must be continually replenished from larger bodies (Wyatt 2008, Krivov 2010)

  • The Herschel Open Time Key Programme (OTKP) Dust around Nearby Stars (DUNES, Eiroa et al 2010) observed 133 nearby, Sun-like stars searching for evidence of excess emission at far-infrared wavelengths above that expected from the star

  • Several of the targets were observed with the PACS 70/160 μm combination and/or with SPIRE (Griffin et al 2010) at 250, 350 and 500 μm depending on the expected properties of the source

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Summary

Introduction

Circumstellar dust around mature main sequence stars is a marker for the occurence of a planet(esimal) formation process because the dust we observe, being shorter lived than the star it orbits, must be continually replenished from larger bodies (Wyatt 2008, Krivov 2010). The Herschel Open Time Key Programme (OTKP) Dust around Nearby Stars (DUNES, Eiroa et al 2010) observed 133 nearby, Sun-like stars searching for evidence of excess emission at far-infrared wavelengths above that expected from the star. In addition to the 133 stars observed directly by DUNES, we share observations of another 106 stars with another Herschel OTKP studying debr is discs, DEBRIS (Disc Emission from Bias-free Reconnaissance in the Infrared and Sub-millimetre, Matthews et al 2010). In this proceedings we only detail results from targets observed directly by DUNES

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