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Published August 2, 2010 | Published
Book Section - Chapter Open

Phase Closure Nulling: results from the 2009 campaign

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.

Additional Information

© 2010 SPIE The International Society for Optical Engineering. The authors warmly thank the ESO/VLTI and CHARA teams for their support during the observations.

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