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The HOSTS survey for exozodiacal dust : observational results from the complete survey

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Ertel, S., Defrere, D., Hinz, P., Mennesson, B., Kennedy, G. M., Danchi, W., Gelino, C., Hill, J. M., Hoffmann, W. F., Mazoyer, J. et al.
(2020) The HOSTS survey for exozodiacal dust : observational results from the complete survey. The Astronomical Journal . (In Press)

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Abstract

The Large Binocular Telescope Interferometer (LBTI) enables nulling interferometric observations across the N band (8 to 13 um) to suppress a star's bright light and probe for faint circumstellar emission. We present and statistically analyze the results from the LBTI/HOSTS (Hunt for Observable Signatures of Terrestrial Systems) survey for exozodiacal dust. By comparing our measurements to model predictions based on the Solar zodiacal dust in the N band, we estimate a 1 sigma median sensitivity of 23 zodis for early type stars and 48 zodis for Sun-like stars, where 1 zodi is the surface density of habitable zone (HZ) dust in the Solar system. Of the 38 stars observed, 10 show significant excess. A clear correlation of our detections with the presence of cold dust in the systems was found, but none with the stellar spectral type or age. The majority of Sun-like stars have relatively low HZ dust levels (best-fit median: 3 zodis, 1 sigma upper limit: 9 zodis, 95% confidence: 27 zodis based on our N band measurements), while ~20% are significantly more dusty. The Solar system's HZ dust content is consistent with being typical. Our median HZ dust level would not be a major limitation to the direct imaging search for Earth-like exoplanets, but more precise constraints are still required, in particular to evaluate the impact of exozodiacal dust for the spectroscopic characterization of imaged exo-Earth candidates.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Habitable planets, Disks (Astrophysics), Space interferometry, Extrasolar planets -- Research
Journal or Publication Title: The Astronomical Journal
Publisher: Institute of Physics Publishing, Inc.
ISSN: 0004-6256
Official Date: 18 February 2020
Dates:
DateEvent
18 February 2020Accepted
Date of first compliant deposit: 23 March 2020
Status: Peer Reviewed
Publication Status: In Press
Access rights to Published version: Restricted or Subscription Access
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