13 September 2012 High-contrast imaging in the Hyades with snapshot LOCI
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To image faint substellar companions obscured by the stellar halo and speckles, scattered light from the bright primary star must be removed in hardware or software. We apply the "locally-optimized combination of images" (LOCI) algorithm to 1-minute Keck Observatory snapshots of GKM dwarfs in the Hyades using source diversity to determine the most likely PSF. We obtain a mean contrast of 10-2 at 0".01, 10-4 at <1", and 10-5 at 5". New brown dwarf and low-mass stellar companions to Hyades primaries are found in a third of the 84 targeted systems. This campaign shows the efficacy of LOCI on snapshot imaging as well as on bright wide binaries with off-axis LOCI, reaching contrasts sufficient for imaging 625-Myr late-L/early-T dwarfs purely in post-processing.
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Katie M. Morzinski, Katie M. Morzinski, Bruce A. Macintosh, Bruce A. Macintosh, Laird M. Close, Laird M. Close, Christian Marois, Christian Marois, Quinn Konopacky, Quinn Konopacky, Jenny Patience, Jenny Patience, } "High-contrast imaging in the Hyades with snapshot LOCI", Proc. SPIE 8447, Adaptive Optics Systems III, 84470O (13 September 2012); doi: 10.1117/12.926377; https://doi.org/10.1117/12.926377

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