Characterizing closure-phase measurements at IOTA

Sam Ragland; Wesley Arthur Traub; Jean-Philippe Berger; Rafael Millan-Gabet; John D. Monnier; Ettore Pedretti; F. Peter Schloerb; Nathaniel P. Carleton; Pierre Haguenauer; Pierre Y. Kern; Pierre R. Labeye; Marc G. Lacasse; Fabien Malbet; Karine Rousselet-Perraut

doi:10.1117/12.552447

20 October 2004 Characterizing closure-phase measurements at IOTA

Sam Ragland, Wesley Arthur Traub, Jean-Philippe Berger, Rafael Millan-Gabet, John D. Monnier, Ettore Pedretti, F. Peter Schloerb, Nathaniel P. Carleton, Pierre Haguenauer, Pierre Y. Kern, Pierre R. Labeye, Marc G. Lacasse, Fabien Malbet, Karine Rousselet-Perraut

Author Affiliations +

Proceedings Volume 5491, New Frontiers in Stellar Interferometry; (2004) https://doi.org/10.1117/12.552447
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

We are working towards imaging the surfaces and circumstellar envelopes of Mira stars in the near-infrared, using the IOTA interferometer and the IONIC integrated-optics 3-beam combiner. In order to study atmospheric structures of these stars, we installed 3 narrow-band filters that subdivide H-band into 3 roughly equal-width sub-bands - a central one for continuum, and 2 adjacent ones to sample Mira star's (mostly water) absorption-bands. We present here our characterization of the IOTA 3-Telescope interferometer for closure-phase measurements with broad and narrow-band filters in the H atmospheric window. This includes characterizing the stability, chromaticity, and polarization effects of the present IOTA optics with the IONIC beam-combiner, and characterizing the accuracy of our closure phase measurements.

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Sam Ragland, Wesley Arthur Traub, Jean-Philippe Berger, Rafael Millan-Gabet, John D. Monnier, Ettore Pedretti, F. Peter Schloerb, Nathaniel P. Carleton, Pierre Haguenauer, Pierre Y. Kern, Pierre R. Labeye, Marc G. Lacasse, Fabien Malbet, and Karine Rousselet-Perraut "Characterizing closure-phase measurements at IOTA", Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004); https://doi.org/10.1117/12.552447

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