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dc.contributor.authorAbsil, O.
dc.contributor.authorDefrère, D.
dc.contributor.authorCoudé du Foresto, V.
dc.contributor.authorDi Folco, E.
dc.contributor.authorMérand, A.
dc.contributor.authorAugereau, J. -C.
dc.contributor.authorErtel, S.
dc.contributor.authorHanot, C.
dc.contributor.authorKervella, P.
dc.contributor.authorMollier, B.
dc.contributor.authorScott, Nicholas William
dc.contributor.authorChe, X.
dc.contributor.authorMonnier, J. D.
dc.contributor.authorThureau, Nathalie Danielle
dc.contributor.authorTuthill, P. G.
dc.contributor.authorten Brummelaar, T. A.
dc.contributor.authorMcAlister, H. A.
dc.contributor.authorSturmann, J.
dc.contributor.authorSturmann, L.
dc.contributor.authorTurner, N.
dc.identifier.citationAbsil , O , Defrère , D , Coudé du Foresto , V , Di Folco , E , Mérand , A , Augereau , J -C , Ertel , S , Hanot , C , Kervella , P , Mollier , B , Scott , N W , Che , X , Monnier , J D , Thureau , N D , Tuthill , P G , ten Brummelaar , T A , McAlister , H A , Sturmann , J , Sturmann , L & Turner , N 2013 , ' A near-infrared interferometric survey of debris disc stars : III. First statistics based on 42 stars observed with CHARA/FLUOR ' , Astronomy & Astrophysics , vol. 555 , A104 .
dc.descriptionThe authors thank the French National Research Agency (ANR) for financial support through contract ANR-2010 BLAN-0505-01 (EXOZODI). O.A. acknowledges financial support from the European Commission’s Sixth Framework Programme as a Marie Curie Intra-European Fellow and from an F.R.S.-FNRS Postdoctoral Fellowship during part(s) of this work.en
dc.description.abstractContext. Dust is expected to be ubiquitous in extrasolar planetary systems owing to the dynamical activity of minor bodies. Inner dust populations are, however, still poorly known because of the high contrast and small angular separation with respect to their host star, and yet, a proper characterisation of exozodiacal dust is mandatory for the design of future Earth-like planet imaging missions. Aims. We aim to determine the level of near-infrared exozodiacal dust emission around a sample of 42 nearby main sequence stars with spectral types ranging from A to K and to investigate its correlation with various stellar parameters and with the presence of cold dust belts. Methods. We use high-precision K-band visibilities obtained with the FLUOR interferometer on the shortest baseline of the CHARA array. The calibrated visibilities are compared with the expected visibility of the stellar photosphere to assess whether there is an additional, fully resolved circumstellar emission source. Results. Near-infrared circumstellar emission amounting to about 1% of the stellar flux is detected around 13 of our 42 target stars. Follow-up observations showed that one of them (eps Cep) is associated with a stellar companion, while another one was detected around what turned out to be a giant star (kap CrB). The remaining 11 excesses found around single main sequence stars are most probably associated with hot circumstellar dust, yielding an overall occurrence rate of 28+8-6 for our (biased) sample. We show that the occurrence rate of bright exozodiacal discs correlates with spectral type, K-band excesses being more frequent around A-type stars. It also correlates with the presence of detectable far-infrared excess emission in the case of solar-type stars. Conclusions. This study provides new insight into the phenomenon of bright exozodiacal discs, showing that hot dust populations are probably linked to outer dust reservoirs in the case of solar-type stars. For A-type stars, no clear conclusion can be made regarding the origin of the detected near-infrared excesses.
dc.relation.ispartofAstronomy & Astrophysicsen
dc.subjectCircumstellar matteren
dc.subjectPlanetary systemsen
dc.subjectBinaries: closeen
dc.subjectStars: fundamental parametersen
dc.subjectTechniques: interferometricen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleA near-infrared interferometric survey of debris disc stars : III. First statistics based on 42 stars observed with CHARA/FLUORen
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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