Article (Scientific journals)
Nulling Data Reduction and On-sky Performance of the Large Binocular Telescope Interferometer
Defrere, Denis; Hinz, P. M.; Mennesson, B. et al.
2016In Astrophysical Journal, 824, p. 66
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iopscience.iop.org/article/10.3847/0004-637X/824/2/66 - Copyright The American Astronomical Society (AAS) and IOP Publishing Limited 2015


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Keywords :
circumstellar matter; techniques: interferometric; zodiacal dust
Abstract :
[en] The Large Binocular Telescope Interferometer (LBTI) is a versatile instrument designed for high angular resolution and high-contrast infrared imaging (1.5-13 μm). In this paper, we focus on the mid-infrared (8-13 μm) nulling mode and present its theory of operation, data reduction, and on-sky performance as of the end of the commissioning phase in 2015 March. With an interferometric baseline of 14.4 m, the LBTI nuller is specifically tuned to resolve the habitable zone of nearby main-sequence stars, where warm exozodiacal dust emission peaks. Measuring the exozodi luminosity function of nearby main-sequence stars is a key milestone to prepare for future exo-Earth direct imaging instruments. Thanks to recent progress in wavefront control and phase stabilization, as well as in data reduction techniques, the LBTI demonstrated in 2015 February a calibrated null accuracy of 0.05% over a 3 hr long observing sequence on the bright nearby A3V star β Leo. This is equivalent to an exozodiacal disk density of 15-30 zodi for a Sun-like star located at 10 pc, depending on the adopted disk model. This result sets a new record for high-contrast mid-infrared interferometric imaging and opens a new window on the study of planetary systems.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Defrere, Denis ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Hinz, P. M.
Mennesson, B.
Hoffmann, W. F.
Millan-Gabet, R.
Skemer, A. J.
Bailey, V.
Danchi, W. C.
Downey, E. C.
Durney, O.
Grenz, P.
Hill, J. M.
McMahon, T. J.
Montoya, M.
Spalding, E.
Vaz, A.
Absil, Olivier  ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Arbo, P.
Bailey, H.
Brusa, G.
Bryden, G.
Esposito, S.
Gaspar, A.
Haniff, C. A.
Kennedy, G. M.
Leisenring, J. M.
Marion, Lindsay ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Nowak, M.
Pinna, E.
Powell, K.
Puglisi, A.
Rieke, G.
Roberge, A.
Serabyn, E.
Sosa, R.
Stapeldfeldt, K.
Su, K.
Weinberger, A. J.
Wyatt, M. C.
More authors (29 more) Less
Language :
English
Title :
Nulling Data Reduction and On-sky Performance of the Large Binocular Telescope Interferometer
Publication date :
14 June 2016
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
IOP Publishing, Bristol, United Kingdom
Volume :
824
Pages :
66
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 02 November 2016

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