Tracking faint fringes with the CHARA-Michigan Phasetracker (CHAMP)

J.~D. Monnier, F. Baron, M. Anderson, S. Kraus, R. Millan-Gabet, E. Pedretti, X. Che, T. ten Brummelaar, N. Calvet

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

The CHARA-Michigan Phasetracker (CHAMP) successfully tracks fringes in 4-telescope and 6-telescope modes when observing high-visibility targets. We have found that our primary targets (Young Stellar Objects) have unexpectedly low visibility fringes (<20%) for most baselines at CHARA, generally below our tracking thresholds. We have undertaken an upgrade cycle in 2011-2012 to re-optimize CHAMP to allow group-delay tracking on the faintest fringes possible. We describe our multi-pronged strategy using special dicroics, new piezo scanners, and our first attempts to explore CHARA J-band made possible by using special metrology-blocking laser filters. CHAMP can now be used with all the combiners at CHARA. © (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Original languageEnglish
Title of host publicationSociety of Photo-Optical Instrumentation Engineers (SPIE) Conference Series
Subtitle of host publicationAmsterdam, Netherlands | July 01, 2012
Pages1
Number of pages1
Volume8445
DOIs
Publication statusPublished - 12 Sep 2012

Publication series

NameSociety of Photo-Optical Instrumentation Engineers (SPIE) Conference Series

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