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

S. Ertel, G. M. Kennedy, D. Defrère, P. Hinz, A. B. Shannon, B. Mennesson, W. C. Danchi, C. Gelino, J. M. Hill, W. F. Hoffman, G. Rieke, E. Spalding, J. M. Stone, A. Vaz, A. J. Weinberger, P. Willems, O. Absil, P. Arbo, V. P. Bailey, C. BeichmanG. Bryden, E. C. Downey, O. Durney, S. Esposito, A. Gaspar, P. Grenz, C. A. Haniff, J. M. Leisenring, L. Marion, T. J. McMahon, R. Millan-Gabet, M. Montoya, K. M. Morzinski, E. Pinna, J. Power, A. Puglisi, A. Roberge, E. Serabyn, A. J. Skemer, K. Stapelfeldt, K. Y.L. Su, V. Vaitheeswaran, M. C. Wyatt

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

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+11 -20% for stars with previously detected mid- to far-infrared excess to 11+9 -4% 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.

Original languageEnglish (US)
Title of host publicationSpace Telescopes and Instrumentation 2018
Subtitle of host publicationOptical, Infrared, and Millimeter Wave
EditorsGiovanni G. Fazio, Howard A. MacEwen, Makenzie Lystrup
PublisherSPIE
ISBN (Print)9781510619494
DOIs
StatePublished - Jan 1 2018
EventSpace Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave - Austin, United States
Duration: Jun 10 2018Jun 15 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10698
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherSpace Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave
CountryUnited States
CityAustin
Period6/10/186/15/18

Keywords

  • Exo-Earth imaging
  • Exo-zodiacal dust
  • Habitable zone
  • High contrast imaging
  • Interferometry
  • Mid-infrared

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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    Ertel, S., Kennedy, G. M., Defrère, D., Hinz, P., Shannon, A. B., Mennesson, B., Danchi, W. C., Gelino, C., Hill, J. M., Hoffman, W. F., Rieke, G., Spalding, E., Stone, J. M., Vaz, A., Weinberger, A. J., Willems, P., Absil, O., Arbo, P., Bailey, V. P., ... Wyatt, M. C. (2018). The HOSTS survey for exo-zodiacal dust: Preliminary results and future prospects. In G. G. Fazio, H. A. MacEwen, & M. Lystrup (Eds.), Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave [106981V] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10698). SPIE. https://doi.org/10.1117/12.2313685