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The HOSTS survey - exozodiacal dust measurements for 30 stars
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(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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WRAP-HOSTS-survey-exozodiacal-dust-measurements-30-stars-Kennedy-2018.pdf - Accepted Version - Requires a PDF viewer. Download (3157Kb) | Preview |
Official URL: http://dx.doi.org/10.3847/1538-3881/aab717
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 | |||||||||||||||||||||||||||||||||||||||||||||||||||
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| 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 | |||||||||||||||||||||||||||||||||||||||||||||||||||
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| 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 | |||||||||||||||||||||||||||||||||||||||||||||||||||
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