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arxiv 2012.01835 v1 pith:SWOFBLEK submitted 2020-12-03 astro-ph.IM

A New Frontier for J-band Interferometry: Dual-band NIRInterferometry with MIRC-X

Aaron Labdon , John D. Monnier , Stefan Kraus , Jean-Baptiste Le Bouquin , Benjamin R. Setterholm , Narsireddy Anugu , Theo ten Brummelaar , Cyrien Lanthermann
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Claire L. Davies Jacob Ennis Tyler Gardener Gail H. Schaefer Lazlo Sturmann Judit Sturmann
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keywords mirc-xreportadditionallowarraybandbehindbirefringence
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In this contribution we report on our work to increase the spectral range of the Michigan Infrared Combiner-eXeter (MIRC-X) instrument at the CHARA array to allow for dual H and J band interferometric observations. We comment on the key science drivers behind this project and the methods of characterisation and correction of instrumental birefringence and dispersion. In addition, we report on the first results from on-sky commissioning in November 2019.

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