2010ApJ...724..464M -
Astrophys. J., 724, 464-469 (2010/November-3)
Kernel phase in fizeau interferometry.
MARTINACHE F.
Abstract (from CDS):
The detection of high contrast companions at small angular separation appears feasible in conventional direct images using the self-calibration properties of interferometric observable quantities. The friendly notion of closure phase, which is key to the recent observational successes of non-redundant aperture masking interferometry used with adaptive optics, appears to be one example of a wide family of observable quantities that are not contaminated by phase noise. In the high-Strehl regime, soon to be available thanks to the coming generation of extreme adaptive optics systems on ground-based telescopes, and already available from space, closure phase like information can be extracted from any direct image, even taken with a redundant aperture. These new phase-noise immune observable quantities, called kernel phases, are determined a priori from the knowledge of the geometry of the pupil only. Re-analysis of archive data acquired with the Hubble Space Telescope NICMOS instrument using this new kernel-phase algorithm demonstrates the power of the method as it clearly detects and locates with milliarcsecond precision a known companion to a star at angular separation less than the diffraction limit.
Abstract Copyright:
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Journal keyword(s):
binaries: close - methods: data analysis - stars: low-mass - techniques: high angular resolution - techniques: image processing - techniques: interferometric
Simbad objects:
5
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