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Proceedings Paper

Development of a statistical reduction method for the Palomar Fiber Nuller
Author(s): Charles Hanot; Bertrand Mennesson; Eugene Serabyn; Stefan Martin; Kurt Liewer; Frank Loya; Dimitri Mawet; Pierre Riaud; Olivier Absil
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Paper Abstract

A unique statistical data analysis method has been developed for reducing nulling interferometry data. The idea is to make use of the statistical distributions of the fluctuating null depths and beam intensities to retrieve the astrophysical null depth in the presence of fluctuations. The approach yields an accuracy much better than is possible with standard data reduction methods, because the accuracy of the null depth is not limited by the sizes of the phase and intensity errors but by the uncertainties on their statistical distributions. The result is an improvement in the instrumental null depth measurement limit of roughly an order of magnitude. We show in this paper that broadband null depths of 10-4 can be measured in the lab with our infrared Fiber Nuller without achromatic phase shifters. On sky results are also dramatically improved, with measured contrasts up to a couple of 10-4 with our instrument mounted on the Hale telescope at the Palomar Observatory. This statistical analysis is not specific to our instrument and may be applicable to other interferometers.

Paper Details

Date Published: 21 July 2010
PDF: 12 pages
Proc. SPIE 7734, Optical and Infrared Interferometry II, 77342S (21 July 2010); doi: 10.1117/12.857014
Show Author Affiliations
Charles Hanot, Univ. de Liège (Belgium)
Bertrand Mennesson, Jet Propulsion Lab. (United States)
Eugene Serabyn, Jet Propulsion Lab. (United States)
Stefan Martin, Jet Propulsion Lab. (United States)
Kurt Liewer, Jet Propulsion Lab. (United States)
Frank Loya, Jet Propulsion Lab. (United States)
Dimitri Mawet, Jet Propulsion Lab. (United States)
Pierre Riaud, Univ. de Liège (Belgium)
Olivier Absil, Univ. de Liège (Belgium)

Published in SPIE Proceedings Vol. 7734:
Optical and Infrared Interferometry II
William C. Danchi; Françoise Delplancke; Jayadev K. Rajagopal, Editor(s)

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