Reference : Improving Interferometric null depth measurements using statistical distributions: theor...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/85182
Improving Interferometric null depth measurements using statistical distributions: theory and first results with the Palomar Fiber Nuller
English
Hanot, Charles [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Mennesson, Bertrand [ > > ]
Martin, Stefan [ > > ]
Liewer, Kurt [ > > ]
Loya, Frank [ > > ]
Mawet, Dimitri [ > > ]
Riaud, Pierre [ > > ]
Absil, Olivier mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Serabyn, Eugene [ > > ]
11-Mar-2011
Astrophysical Journal
University of Chicago Press
729
2
110
Yes (verified by ORBi)
International
0004-637X
1538-4357
Chicago
IL
[en] instrumentation: high angular resolution ; instrumentation: interferometers ; methods: data analysis; methods: statistical
[en] A new "self-calibrated" statistical analysis method has been developed for the reduction of nulling interferometry data. The idea is to use the statistical distributions of the fluctuating null depth and beam intensities to retrieve the astrophysical null depth (or equivalently the object's visibility) in the presence of fast atmospheric fluctuations. The approach yields an accuracy much better (about an order of magnitude) than is presently possible with standard data reduction methods, because the astrophysical null depth accuracy is no longer limited by the magnitude of the instrumental phase and intensity errors but by uncertainties on their probability distributions. This approach was tested on the sky with the two-aperture fiber nulling instrument mounted on the Palomar Hale telescope. Using our new data analysis approach alone—and no observations of calibrators—we find that error bars on the astrophysical null depth as low as a few 10–4 can be obtained in the near-infrared, which means that null depths lower than 10–3 can be reliably measured. This statistical analysis is not specific to our instrument and may be applicable to other interferometers.
Researchers ; Students
http://hdl.handle.net/2268/85182
10.1088/0004-637X/729/2/110

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