Incidence of debris discs around FGK stars in the solar neighbourhood

摘要: Debris discs are a consequence of the planet formation process and constitute fingerprints planetesimal systems. Their solar system's counterparts asteroid Edgeworth-Kuiper belts. The aim this paper is to provide robust numbers for incidence debris around FGK stars in neighbourhood. full sample 177 with d<20 pc proposed DUNES survey presented. Herschel/PACS observations at 100 160 micron complemented data 70 micron, 250, 350 500 SPIRE photometry, were obtained. 123 objects observed by collaboration presented previous paper. remaining 54 stars, shared DEBRIS consortium them, combined studied per spectral type analysed put into context together other parameters sample, like metallicity, rotation activity, age. The subsample 105 d<15 containing 23 F, 33 G 49 K complete F almost contains substantial number draw solid conclusions on type. rates 0.26 (6 excesses out stars), 0.21 (7 stars) 0.20 (10 fraction all three types being 0.22 (23 stars). Uncertainties corresponding 95% confidence level given text these numbers. medians upper limits L_dust/L_* each 7.8E-7 (F), 1.4E-6 (G) 2.2E-6 (K); lowest values 4.0E-7. similar active (young) inactive (old) stars. fractional luminosity tends drop increasing age, as expected from collisional erosion