High-contrast imaging in the Hyades with snapshot LOCI

Katie M. Morzinski; Bruce A. Macintosh; Laird M. Close; Christian Marois; Quinn Konopacky; Jenny Patience

doi:10.1117/12.926377

13 September 2012 High-contrast imaging in the Hyades with snapshot LOCI

Katie M. Morzinski, Bruce A. Macintosh, Laird M. Close, Christian Marois, Quinn Konopacky, Jenny Patience

Proceedings Volume 8447, Adaptive Optics Systems III; 84470O (2012) https://doi.org/10.1117/12.926377
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

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.

Citation Download Citation

Katie M. Morzinski, Bruce A. Macintosh, Laird M. Close, Christian Marois, Quinn Konopacky, and Jenny Patience "High-contrast imaging in the Hyades with snapshot LOCI", Proc. SPIE 8447, Adaptive Optics Systems III, 84470O (13 September 2012); https://doi.org/10.1117/12.926377

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