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Proceedings Paper

Aperture mask interferometry with an integral field spectrograph
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Paper 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.

Paper Details

Date Published: 12 September 2012
PDF: 15 pages
Proc. SPIE 8445, Optical and Infrared Interferometry III, 84452G (12 September 2012); doi: 10.1117/12.926204
Show Author Affiliations
Neil Zimmerman, Max Planck Institute for Astronomy (Germany)
American Museum of Natural History (United States)
Anand Sivaramakrishnan, Space Telescope Science Institute (United States)
American Museum of Natural History (United States)
Stony Brook Univ. (United States)
David Bernat, Cornell Univ. (United States)
Ben R Oppenheimer, American Museum of Natural History (United States)
Sasha Hinkley, California Institute of Technology (United States)
Sagan Fellow, NASA Exoplanet Science Institute (United States)
James P. Lloyd, Cornell Univ. (United States)
Peter G. Tuthill, The Univ. of Sydney (Australia)
Douglas Brenner, American Museum of Natural History (United States)
Ian R. Parry, Cambridge Univ. (United Kingdom)
Michal Simon, Stony Brook Univ. (United States)
John E. Krist, Jet Propulsion Lab. (United States)
Laurent Pueyo, Johns Hopkins Univ. (United States)
Sagan Fellow, NASA Exoplanet Science Institute (United States)

Published in SPIE Proceedings Vol. 8445:
Optical and Infrared Interferometry III
Françoise Delplancke; Jayadev K. Rajagopal; Fabien Malbet, Editor(s)

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