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Proceedings Paper

High-contrast imaging in the Hyades with snapshot LOCI
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Paper 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.

Paper Details

Date Published: 13 September 2012
PDF: 12 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 84470O (13 September 2012); doi: 10.1117/12.926377
Show Author Affiliations
Katie M. Morzinski, Steward Observatory, The Univ. of Arizona (United States)
Bruce A. Macintosh, Lawrence Livermore National Lab. (United States)
Laird M. Close, Steward Observatory, The Univ. of Arizona (United States)
Christian Marois, NRC Herzberg Institute of Astrophysics (Canada)
Quinn Konopacky, Dunlap Institute for Astronomy and Astrophysics (Canada)
Jenny Patience, School of Earth & Space Exploration, Arizona State Univ. (United States)

Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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