期刊
ASTROPHYSICAL JOURNAL
卷 724, 期 1, 页码 464-469出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/724/1/464
关键词
binaries: close; methods: data analysis; stars: low-mass; techniques: high angular resolution; techniques: image processing; techniques: interferometric
资金
- Jet Propulsion Laboratory [1379504]
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.
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