Aperture mask interferometry with an integral field spectrograph

Neil Zimmerman; Anand Sivaramakrishnan; David Bernat; Ben R Oppenheimer; Sasha Hinkley; James P. Lloyd; Peter G. Tuthill; Douglas Brenner; Ian R. Parry; Michal Simon; John E. Krist; Laurent Pueyo

doi:10.1117/12.926204

12 September 2012 Aperture mask interferometry with an integral field spectrograph

Neil Zimmerman, Anand Sivaramakrishnan, David Bernat, Ben R Oppenheimer, Sasha Hinkley, James P. Lloyd, Peter G. Tuthill, Douglas Brenner, Ian R. Parry, Michal Simon, John E. Krist, Laurent Pueyo

Author Affiliations +

Proceedings Volume 8445, Optical and Infrared Interferometry III; 84452G (2012) https://doi.org/10.1117/12.926204
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

A non-redundant pupil mask placed in front of a low-resolution integral field spectrograph (IFS) adds a spectral dimension to high angular resolution imaging behind adaptive optics systems. We demonstrate the first application of this technique, using the spectroscopic binary star system β CrB as our target. The mask and IFS combination enabled us to measure the first low-resolution spectrum of the F3-F5 dwarf secondary component of β CrB, at an angular separation 141 mas from its A5-A7Vp primary star. To record multi-wavelength closure phases, we collected interferograms simultaneously in 23 spectral channels spanning the J and H bands (1.1 μm-1.8 μm), using the Project 1640 IFS behind the 249-channel PalAO adaptive optics system on the Hale telescope at Palomar Observatory. In addition to providing physical information about the source, spectrally resolved mask fringes have the potential to enhance detection limits over single filter observations. While the overall dynamic range of our observation suffers from large systematic calibration errors, the information gleaned from the full channel range improves the dynamic range by a factor of 3 to 4 over the best single channel.

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Neil Zimmerman, Anand Sivaramakrishnan, David Bernat, Ben R Oppenheimer, Sasha Hinkley, James P. Lloyd, Peter G. Tuthill, Douglas Brenner, Ian R. Parry, Michal Simon, John E. Krist, and Laurent Pueyo "Aperture mask interferometry with an integral field spectrograph", Proc. SPIE 8445, Optical and Infrared Interferometry III, 84452G (12 September 2012); https://doi.org/10.1117/12.926204

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