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Making high accuracy null depth measurements for the LBTI Exozodi survey

Mennesson, Bertrand and Defrère, Denis and Nowak, Matthias and Hinz, Philip and Millan-Gabet, Rafael and Absil, Olivier and Bailey, Vanessa and Bryden, Geoffrey and Danchi, William and Kennedy, Grant M. and Marion, Lindsey and Roberge, Aki and Serabyn, Eugene and Skemer, Andy J. and Stapelfeldt, Karl and Weinberger, Alycia J. and Wyatt, Mark (2016) Making high accuracy null depth measurements for the LBTI Exozodi survey. In: Optical and Infrared Interferometry and Imaging V. Proceedings of SPIE. No.9907. Society of Photo-Optical Instrumentation Engineers (SPIE) , Piscataway, NJ, Art. No. 99070X. ISBN 978-1-5106-0193-2.

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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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Mennesson, Bertrand0000-0003-4205-4800
Defrère, Denis0000-0003-3499-2506
Hinz, Philip0000-0002-1954-4564
Millan-Gabet, Rafael0000-0003-0447-5866
Absil, Olivier0000-0002-4006-6237
Bailey, Vanessa0000-0002-5407-2806
Kennedy, Grant M.0000-0001-6831-7547
Roberge, Aki0000-0002-2989-3725
Skemer, Andy J.0000-0001-6098-3924
Stapelfeldt, Karl0000-0002-2805-7338
Weinberger, Alycia J.0000-0001-6654-7859
Additional Information:© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE). 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.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:Exozodiacal light, nulling, mid-infrared, high contrast, interferometry, direct imaging, exoplanets
Series Name:Proceedings of SPIE
Issue or Number:9907
Record Number:CaltechAUTHORS:20170112-111643189
Persistent URL:
Official Citation: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; Making high-accuracy null depth measurements for the LBTI exozodi survey. Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 99070X (August 4, 2016); doi:10.1117/12.2231839.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73471
Deposited By: Ruth Sustaita
Deposited On:20 Jan 2017 00:28
Last Modified:30 Jan 2021 00:19

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