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The HOSTS survey - exozodiacal dust measurements for 30 stars

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Ertel, S., Defrère, D., Hinz, P., Mennesson, B., Kennedy, Grant M., Danchi, W. C., Gelino, C., Hill, J. M., Hoffmann, W. F., Rieke, G. et al.
(2018) The HOSTS survey - exozodiacal dust measurements for 30 stars. The Astronomical Journal, 155 (5). 194. doi:10.3847/1538-3881/aab717

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Official URL: http://dx.doi.org/10.3847/1538-3881/aab717

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Abstract

The Hunt for Observable Signatures of Terrestrial Systems survey searches for dust near the habitable zones (HZs) around nearby, bright main-sequence stars. We use nulling interferometry in the N band to suppress the bright stellar light and to probe for low levels of HZ dust around the 30 stars observed so far. Our overall detection rate is 18%, including four new detections, among which are the first three around Sun-like stars and the first two around stars without any previously known circumstellar dust. The inferred occurrence rates are comparable for early-type and Sun-like stars, but decrease from {60}-21+16% for stars with previously detected cold dust to {8}-3+10% for stars without such excess, confirming earlier results at higher sensitivity. For completed observations on individual stars, our sensitivity is five to ten times better than previous results. Assuming a lognormal excess luminosity function, we put upper limits on the median HZ dust level of 13 zodis (95% confidence) for a sample of stars without cold dust and of 26 zodis when focusing on Sun-like stars without cold dust. However, our data suggest that a more complex luminosity function may be more appropriate. For stars without detectable Large Binocular Telescope Interferometer (LBTI) excess, our upper limits are almost reduced by a factor of two, demonstrating the strength of LBTI target vetting for future exo-Earth imaging missions. Our statistics are limited so far, and extending the survey is critical to informing the design of future exo-Earth imaging surveys.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Extrasolar planets, Interferometry, Circumstellar matter, Planetary systems
Journal or Publication Title: The Astronomical Journal
Publisher: Institute of Physics Publishing, Inc.
ISSN: 1538-3881
Official Date: 17 April 2018
Dates:
DateEvent
17 April 2018Published
13 March 2018Accepted
Date of first compliant deposit: 6 June 2018
Volume: 155
Number: 5
Article Number: 194
DOI: 10.3847/1538-3881/aab717
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
Exoplanet Exploration ProgramNational Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
LBT Corporation partnerUniversity of Arizonahttp://dx.doi.org/10.13039/100007899
LBT Corporation partnerInstituto Nazionale di AstrofisicaUNSPECIFIED
LBT Corporation partnerMax-Planck-Gesellschafthttp://dx.doi.org/10.13039/501100004189
LBT Corporation partnerLeibniz-Institut für Astrophysik Potsdamhttp://viaf.org/viaf/149612630
LBT Corporation partnerUniversität Heidelberghttp://dx.doi.org/10.13039/501100001661
LBT Corporation partnerOhio State Universityhttp://dx.doi.org/10.13039/100006928
LBT Corporation partnerUniversity of Notre Damehttp://dx.doi.org/10.13039/100008109
LBT Corporation partnerUniversity of Minnesotahttp://dx.doi.org/10.13039/100007249
LBT Corporation partnerUniversity of Virginiahttp://dx.doi.org/10.13039/100008457
Research FellowshipRoyal Societyhttp://dx.doi.org/10.13039/501100000288
The Center for Exoplanets and Habitable WorldsPennsylvania State Universityhttp://dx.doi.org/10.13039/100008321
The Center for Exoplanets and Habitable WorldsEberly College of Sciencehttp://viaf.org/viaf/136399239
The Center for Exoplanets and Habitable WorldsPennsylvania Space Grant Consortiumhttp://dx.doi.org/10.13039/100005758
HST-HF2-51398.001-ANational Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
NAS5-26555Space Telescope Science Institute (U.S.)http://viaf.org/viaf/123013418
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