Reference : On the sensitivity of closure phases to faint companions in optical long baseline int...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/117963
On the sensitivity of closure phases to faint companions in optical long baseline interferometry
English
Le Bouquin, Jean-Baptiste [> > > >]
Absil, Olivier mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)]
1-May-2012
Astronomy and Astrophysics
EDP Sciences
541
A89
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] Astrophysics - Instrumentation and Methods for Astrophysics ; Astrophysics - Solar and Stellar Astrophysics
[en] We explore the sensitivity and completeness of long baseline interferometric observations for detecting unknown, faint companions around bright unresolved stars. We derive a linear expression for the closure phase signature of a faint companion in the high contrast regime (<0.1), and provide a quantitative estimation of the detection efficiency for the currently offered four-telescope configurations at the Very Large Telescope Interferometer. The results are compared to the performances provided by linear and Y-shaped interferometric configurations in order to identify the ideal array. We find that all configurations have a similar efficiency in discovering companions wider than 10mas. Assuming a closure phase accuracy of 0.25deg, that is typical of state-of-the-art instruments, we predict a median dynamic range of up to six magnitudes when stacking observations obtained at five different hour angles. Surveying bright stars to search for faint companions can be considered as an ideal filler programme for modern interferometric facilities because that places few constraints on the choice of the interferometric configuration.
Researchers
http://hdl.handle.net/2268/117963
10.1051/0004-6361/201117891
http://adsabs.harvard.edu/abs/2012arXiv1204.3721L
http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201117891&Itemid=129 Copyright ESO 2012, published by EDP Sciences
http://arxiv.org/abs/1204.3721

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