The MIRC-X 6-telescope imager: Key science drivers, instrument design and operation

TL;DR

MIRC-X is a newly upgraded 6-telescope interferometric imager at the CHARA array, enabling high-resolution imaging of previously inaccessible objects through advanced detector technology and extended wavelength capabilities.

Contribution

The paper introduces the MIRC-X instrument with ultra-low noise detectors, extended wavelength range, and new operational modes, advancing 6-telescope interferometric imaging capabilities.

Findings

Successful commissioning of MIRC-X in June 2017.

Implementation of polarisation control for improved calibration.

Development of a 'cross-talk resilient' mode for exoplanet detection.

Abstract

MIRC-X is a new beam combination instrument at the CHARA array that enables 6-telescope interferometric imaging on object classes that until now have been out of reach for milliarcsecond-resolution imaging. As part of an instrumentation effort lead by the University of Exeter and University of Michigan, we equipped the MIRC instrument with an ultra-low read-noise detector system and extended the wavelength range to the J and H-band. The first phase of the MIRC-X commissioning was successfully completed in June 2017. In 2018 we will commission polarisation control to improve the visibility calibration and implement a 'cross-talk resiliant' mode that will minimise visibility cross-talk and enable exoplanet searches using precision closure phases. Here we outline our key science drivers and give an overview about our commissioning timeline. We comment on operational aspects, such as remote observing, and the prospects of co-phased parallel operations with the upcoming MYSTIC combiner.