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The HOSTS Survey for Exozodiacal Dust: Observational Results from the Complete Survey

Ertel, S. and Defrère, D. and Hinz, P. and Mennesson, B. and Kennedy, G. M. and Danchi, W. C. and Gelino, C. and Hill, J. M. and Hoffmann, W. F. and Mazoyer, J. and Rieke, G. and Shannon, A. and Stapelfeldt, K. and Spalding, E. and Stone, J. M. and Vaz, A. and Weinberger, A. J. and Willems, P. and Absil, O. and Arbo, P. and Bailey, V. P. and Beichman, C. and Bryden, G. and Downey, E. C. and Durney, O. and Esposito, S. and Gaspar, A. and Grenz, P. and Haniff, C. A. and Leisenring, J. M. and Marion, L. and McMahon, T. J. and Millan-Gabet, R. and Montoya, M. and Morzinski, K. M. and Perera, S. and Pinna, E. and Pott, J.-U. and Power, J. and Puglisi, A. and Roberge, A. and Serabyn, E. and Skemer, A. J. and Su, K. Y. L. and Vaitheeswaran, V. and Wyatt, M. C. (2020) The HOSTS Survey for Exozodiacal Dust: Observational Results from the Complete Survey. Astronomical Journal, 159 (4). Art. No. 177. ISSN 1538-3881. doi:10.3847/1538-3881/ab7817.

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The Large Binocular Telescope Interferometer (LBTI) enables nulling interferometric observations across the N band (8 to 13 μm) to suppress a star's bright light and probe for faint circumstellar emission. We present and statistically analyze the results from the LBTI/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 1σ median sensitivity of 23 zodis times the solar system dust surface density in its habitable zone (HZ; 23 zodis) for early-type stars and 48 zodis for Sun-like stars, where 1 zodi is the surface density of 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, 1σ 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:Article
Related URLs:
URLURL TypeDescription Paper
Ertel, S.0000-0002-2314-7289
Mennesson, B.0000-0003-4205-4800
Mazoyer, J.0000-0002-9133-3091
Rieke, G.0000-0003-2303-6519
Shannon, A.0000-0002-0711-4516
Stapelfeldt, K.0000-0002-2805-7338
Stone, J. M.0000-0003-0454-3718
Weinberger, A. J.0000-0001-6654-7859
Absil, O.0000-0002-4006-6237
Bailey, V. P.0000-0002-5407-2806
Beichman, C.0000-0002-5627-5471
Gaspar, A.0000-0001-8612-3236
Leisenring, J. M.0000-0002-0834-6140
Millan-Gabet, R.0000-0003-0447-5866
Morzinski, K. M.0000-0002-1384-0063
Pott, J.-U.0000-0003-4291-2078
Roberge, A.0000-0002-2989-3725
Skemer, A. J.0000-0001-6098-3924
Su, K. Y. L.0000-0002-3532-5580
Wyatt, M. C.0000-0001-9064-5598
Additional Information:© 2020 The American Astronomical Society. Received 2019 September 8; revised 2020 February 18; accepted 2020 February 18; published 2020 March 30. The Large Binocular Telescope Interferometer is funded by the National Aeronautics and Space Administration as part of its Exoplanet Exploration Program. The LBT is an international collaboration among institutions in the United States, Italy, and Germany. LBT Corporation partners are The University of Arizona on behalf of the Arizona university system; Instituto Nazionale di Astrofisica, Italy; LBT Beteiligungsgesellschaft, Germany, representing the Max-Planck Society, the Astrophysical Institute Potsdam, and Heidelberg University; The Ohio State University, and The Research Corporation, on behalf of The University of Notre Dame, University of Minnesota and University of Virginia. Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. G.M.K is supported by the Royal Society as a Royal Society University Research Fellow. K.M.M.'s work is supported by the NASA Exoplanets Research Program (XRP) by cooperative agreement NNX16AD44G. This research has made extensive use of the SIMBAD database (Wenger et al. 2000) and the VizieR catalog access tool (Ochsenbein et al. 2000), both operated at CDS, Strasbourg, France, of Python, including the NumPy, SciPy, Matplotlib (Hunter 2007), and Astropy (Astropy Collaboration et al. 2013) libraries, and of NASA's Astrophysics Data System Bibliographic Services. Facility: LBT (LBTI/NOMIC). -
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:Exozodiacal dust ; Debris disks ; Habitable zone ; Habitable planets
Issue or Number:4
Classification Code:Unified Astronomy Thesaurus concepts: Exozodiacal dust (500); Debris disks (363); Habitable zone (696); Habitable planets (695)
Record Number:CaltechAUTHORS:20200331-124523725
Persistent URL:
Official Citation:S. Ertel et al 2020 AJ 159 177
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102202
Deposited By: Tony Diaz
Deposited On:31 Mar 2020 19:55
Last Modified:16 Nov 2021 18:09

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