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Proceedings Paper

Phase closure nulling: results from the 2009 campaign
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Paper Abstract

We present here a new observational technique, Phase Closure Nulling (PCN), which has the potential to obtain very high contrast detection and spectroscopy of faint companions to bright stars. PCN consists in measuring closure phases of fully resolved objects with a baseline triplet where one of the baselines crosses a null of the object visibility function. For scenes dominated by the presence of a stellar disk, the correlated flux of the star around nulls is essentially canceled out, and in these regions the signature of fainter, unresolved, scene object(s) dominates the imaginary part of the visibility in particular the closure phase. We present here the basics of the PCN method, the initial proof-of-concept observation, the envisioned science cases and report about the first observing campaign made on VLTI/AMBER and CHARA/MIRC using this technique.

Paper Details

Date Published: 2 August 2010
PDF: 9 pages
Proc. SPIE 7734, Optical and Infrared Interferometry II, 77340U (2 August 2010); doi: 10.1117/12.857970
Show Author Affiliations
Gilles Duvert, Lab. d'Astrophysique de l'Observatoire de Grenoble. Univ. J. Fourier, CNRS (France)
Fabien Malbet, Lab. d'Astrophysique de l'Observatoire de Grenoble. Univ. J. Fourier, CNRS (France)
Alain Chelli, Lab. d'Astrophysique de l'Observatoire de Grenoble. Univ. J. Fourier, CNRS (France)
Rafael Millan-Gabet, NASA Exoplanet Science Institute, California Institute of Technology (United States)
John D. Monnier, Univ. of Michigan (United States)
Gail H. Schaefer, CHARA Array of Georgia State Univ., Mount Wilson Observatory (United States)


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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