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    A near-infrared interferometric survey of debris-disc stars

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    Author
    Nuñez, P. D.
    Scott, N. J.
    Mennesson, B.
    Absil, O.
    Augereau, J.-C.
    Bryden, G.
    ten Brummelaar, T.
    Ertel, S.
    Coudé du Foresto, V.
    Ridgway, S. T.
    Sturmann, J.
    Sturmann, L.
    Turner, N. J.
    Turner, N. H.
    Show allShow less
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2017-12-13
    Keywords
    circumstellar matter
    binaries: close
    planets and satellites: detection
    techniques: interferometric
    
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    Publisher
    EDP SCIENCES S A
    Citation
    A near-infrared interferometric survey of debris-disc stars 2017, 608:A113 Astronomy & Astrophysics
    Journal
    Astronomy & Astrophysics
    Rights
    © ESO, 2017
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We report the results of high-angular-resolution observations that search for exozodiacal light in a sample of main sequence stars and sub-giants. Using the "jouvence" of the fiber linked unit for optical recombination (JouFLU) at the center for high angular resolution astronomy (CHARA) telescope array, we have observed a total of 44 stars. Out of the 44 stars, 33 are new stars added to the initial, previously published survey of 42 stars performed at CHARA with the fiber linked unit for optical recombination (FLUOR). Since the start of the survey extension, we have detected a K-band circumstellar excess for six new stars at the similar to 1% level or higher, four of which are known or candidate binaries, and two for which the excess could be attributed to exozodiacal dust. We have also performed follow-up observations of 11 of the stars observed in the previously published survey and found generally consistent results. We do however detect a significantly larger excess on three of these follow-up targets: Altair, v And and kappa CrB. Interestingly, the last two are known exoplanet host stars. We perform a statistical analysis of the JouFLU and FLUOR samples combined, which yields an overall exozodi detection rate of 21.7(-4.1)(+5.7) %. We also find that the K-band excess in FGK-type stars correlates with the existence of an outer reservoir of cold (less than or similar to 100 K) dust at the 99% confidence level, while the same cannot be said for A-type stars.
    Note
    Open access journal.
    ISSN
    0004-6361
    1432-0746
    DOI
    10.1051/0004-6361/201730859
    Version
    Final published version
    Sponsors
    NASA Exoplanet Research Program element [NNN13D460T]; National Science Foundation [AST-1211929]
    Additional Links
    http://www.aanda.org/10.1051/0004-6361/201730859
    ae974a485f413a2113503eed53cd6c53
    10.1051/0004-6361/201730859
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