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    The HOSTS survey for exo-zodiacal dust: preliminary results and future prospects

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    Author
    Ertel, Steve
    Hinz, Phil
    Defrère, Denis
    Mennesson, Bertrand
    Kennedy, Grant
    Weinberger, Alycia J.
    Phillip, Willems A.
    Absil, Olivier
    Arbo, Paul
    Bailey, Vanessa P.
    Beichman, Charles A.
    Bryden, Geoffrey
    Pinna, Enrico
    Power, Jennifer
    Puglisi, Alfio
    Shannon, Andrew B.
    Danchi, William C.
    Gelino, Christopher
    Hill, John M.
    Hoffman, William F.
    Rieke, George
    Spalding, Eckhart
    Stone, Jordan M. cc
    Vaz, Amali L.
    Downey, Elwood C.
    Durney, Oliver
    Esposito, Simone
    Gaspar, Andras
    Grenz, Paul
    Haniff, Chris A.
    Leisenring, Jarron M.
    Marion, Lindsay
    McMahon, Tom J.
    Millan-Gabet, Rafael
    Montoya, Manny
    Morzinski, Katie M.
    Roberge, Aki
    Serabyn, Eugene
    Skemer, Andrew J. cc
    Stapelfeldt, Karl
    Su, Kate Y.
    Vidhya, Vaitheeswaran
    Wyatt, Mark C.
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    Affiliation
    Univ Arizona, Dept Astron, Steward Observ
    Univ Arizona, Large Binocular Telescope Observ
    Issue Date
    2018-07-24
    Keywords
    Exo-zodiacal dust
    Interferometry
    High contrast imaging
    Habitable zone
    Exo-Earth imaging
    Mid-infrared
    
    Metadata
    Show full item record
    Publisher
    SPIE-INT SOC OPTICAL ENGINEERING
    Citation
    Ertel, S., Kennedy, G. M., Defrère, D., Hinz, P., Shannon, A. B., Mennesson, B., ... & Wyatt, M. C. (2018, July). The HOSTS survey for exo-zodiacal dust: preliminary results and future prospects. In Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave (Vol. 10698, p. 106981V). International Society for Optics and Photonics.
    Journal
    SPACE TELESCOPES AND INSTRUMENTATION 2018: OPTICAL, INFRARED, AND MILLIMETER WAVE
    Rights
    © 2018 SPIE.
    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
    The presence of large amounts of dust in the habitable zones of nearby stars is a significant obstacle for future exo-Earth imaging missions. We executed the HOSTS (Hunt for Observable Signatures of Terrestrial Systems) survey to determine the typical amount of such exozodiacal dust around a sample of nearby main sequence stars. The majority of the data have been analyzed and we present here an update of our ongoing work. Nulling interferometry in N band was used to suppress the bright stellar light and to detect faint, extended circumstellar dust emission. We present an overview of the latest results from our ongoing work. We find seven new N band excesses in addition to the high confidence confirmation of three that were previously known. We find the first detections around Sun-like stars and around stars without previously known circumstellar dust. Our overall detection rate is 23%. The inferred occurrence rate is comparable for early type and Sun-like stars, but decreases from 71(-20)(+11) % for stars with previously detected mid- to far-infrared excess to 11(-4)(+9) % for stars without such excess, confirming earlier results at high confidence. For completed observations on individual stars, our sensitivity is five to ten times better than previous results. Assuming a lognormal luminosity function of the dust, we find upper limits on the median dust level around all stars without previously known mid to far infrared excess of 11.5 zodis at 95% confidence level. The corresponding upper limit for Sun-like stars is 16 zodis. An LBTI vetted target list of Sun-like stars for exo-Earth imaging would have a corresponding limit of 7.5 zodis. We provide important new insights into the occurrence rate and typical levels of habitable zone dust around main sequence stars. Exploiting the full range of capabilities of the LBTI provides a critical opportunity for the detailed characterization of a sample of exozodiacal dust disks to understand the origin, distribution, and properties of the dust.
    ISSN
    0277-786X
    DOI
    10.1117/12.2313685
    Version
    Final published version
    Sponsors
    National Aeronautics and Space Administration, Exoplanet Exploration Program; Royal Society; Center for Exoplanets and Habitable Worlds; Pennsylvania State University; Eberly College of Science; Pennsylvania Space Grant Consortium; NASA through Hubble Fellowship - Space Telescope Science Institute [HST-HF2-51398.001-A]; NASA [NAS5-26555]
    ae974a485f413a2113503eed53cd6c53
    10.1117/12.2313685
    Scopus Count
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    UA Faculty Publications

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