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A near-infrared interferometric survey of debris disc stars. III. First statistics based on 42 stars observed with CHARA/FLUOR

hal.structure.identifierUniversité de Liège
dc.contributor.authorABSIL, O.
dc.contributor.authorDEFRÈRE, D.
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA]
dc.contributor.authorFORESTO, V. Coudé Du
hal.structure.identifierAMOR 2013
dc.contributor.authorDI FOLCO, E.
dc.contributor.authorMÉRAND, A.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG ]
dc.contributor.authorAUGEREAU, J. -C.
dc.contributor.authorERTEL, S.
dc.contributor.authorHANOT, C.
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA]
dc.contributor.authorKERVELLA, P.
dc.contributor.authorMOLLIER, B.
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
dc.contributor.authorSCOTT, N.
hal.structure.identifierDepartment of Astronomy [Ann Arbor]
dc.contributor.authorCHE, X.
hal.structure.identifierDepartment of Astronomy [Ann Arbor]
dc.contributor.authorMONNIER, J. D.
dc.contributor.authorTHUREAU, N.
dc.contributor.authorTUTHILL, P. G.
dc.contributor.authorBRUMMELAAR, T. A. Ten
hal.structure.identifierCenter for High Angular Resolution Astronomy [CHARA]
dc.contributor.authorMCALISTER, H. A.
hal.structure.identifierCenter for High Angular Resolution Astronomy [CHARA]
dc.contributor.authorSTURMANN, J.
hal.structure.identifierCenter for High Angular Resolution Astronomy [CHARA]
dc.contributor.authorSTURMANN, L.
dc.contributor.authorTURNER, N.
dc.date.created2013-07-09
dc.date.issued2013
dc.identifier.issn0004-6361
dc.description.abstractEn(Abridged) 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. 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. 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. 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. 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.language.isoen
dc.publisherEDP Sciences
dc.rights.urihttp://creativecommons.org/licenses/by/
dc.title.enA near-infrared interferometric survey of debris disc stars. III. First statistics based on 42 stars observed with CHARA/FLUOR
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201321673
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv1307.2488
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.A104
bordeaux.volume555
bordeaux.peerReviewedoui
hal.identifierhal-00843411
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00843411v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2013&rft.volume=555&rft.spage=id.A104&rft.epage=id.A104&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=ABSIL,%20O.&DEFR%C3%88RE,%20D.&FORESTO,%20V.%20Coud%C3%A9%20Du&DI%20FOLCO,%20E.&M%C3%89RAND,%20A.&rft.genre=article


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