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Proceedings Paper

Making high-accuracy null depth measurements for the LBTI exozodi survey
Author(s): Bertrand Mennesson; Denis Defrère; Matthias Nowak; Philip Hinz; Rafael Millan-Gabet; Olivier Absil; Vanessa Bailey; Geoffrey Bryden; William Danchi; Grant M. Kennedy; Lindsay Marion; Aki Roberge; Eugene Serabyn; Andy J. Skemer; Karl Stapelfeldt; Alycia J. Weinberger; Mark Wyatt
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Paper Abstract

The characterization of exozodiacal light emission is both important for the understanding of planetary systems evolution and for the preparation of future space missions aiming to characterize low mass planets in the habitable zone of nearby main sequence stars. The Large Binocular Telescope Interferometer (LBTI) exozodi survey aims at providing a ten-fold improvement over current state of the art, measuring dust emission levels down to a typical accuracy of ~12 zodis per star, for a representative ensemble of ~30+ high priority targets. Such measurements promise to yield a final accuracy of about 2 zodis on the median exozodi level of the targets sample. Reaching a 1 σ measurement uncertainty of 12 zodis per star corresponds to measuring interferometric cancellation (“null”) levels, i.e visibilities at the few 100 ppm uncertainty level. We discuss here the challenges posed by making such high accuracy mid-infrared visibility measurements from the ground and present the methodology we developed for achieving current best levels of 500 ppm or so. We also discuss current limitations and plans for enhanced exozodi observations over the next few years at LBTI.

Paper Details

Date Published: 4 August 2016
PDF: 12 pages
Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 99070X (4 August 2016); doi: 10.1117/12.2231839
Show Author Affiliations
Bertrand Mennesson, Jet Propulsion Lab. (United States)
Denis Defrère, Univ. de Liège (Belgium)
Matthias Nowak, LESIA, Observatoire de Paris, CNRS, UPMC, Univ. Paris Diderot (France)
Philip Hinz, Steward Observatory (United States)
Rafael Millan-Gabet, California Institute of Technology (United States)
Olivier Absil, Univ. de Liège (Belgium)
Vanessa Bailey, Steward Observatory (United States)
Geoffrey Bryden, Jet Propulsion Lab. (United States)
William Danchi, NASA Goddard Space Flight Ctr. (United States)
Grant M. Kennedy, Univ. of Cambridge (United Kingdom)
Lindsay Marion, Univ. de Liège (Belgium)
Aki Roberge, NASA Goddard Space Flight Ctr. (United States)
Eugene Serabyn, Jet Propulsion Lab. (United States)
Andy J. Skemer, Steward Observatory (United States)
Karl Stapelfeldt, Jet Propulsion Lab. (United States)
Alycia J. Weinberger, Carnegie Institution of Washington (United States)
Mark Wyatt, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 9907:
Optical and Infrared Interferometry and Imaging V
Fabien Malbet; Michelle J. Creech-Eakman; Peter G. Tuthill, Editor(s)

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