High-contrast imaging in the Hyades with snapshot LOCI

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DOIResolve DOI: http://doi.org/10.1117/12.926377
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TypeArticle
Proceedings titleAdaptive Optics Systems III
Series titleProceedings of SPIE; Volume 8447
ConferenceAdaptive Optics Systems III, July 1-6, 2012, Amsterdam, Netherlands
ISSN0277-786X
ISBN9780819491480
Article number84470O
SubjectBrown dwarfs; High contrast imaging; Hyades; Image diversity; LOCI; PSF; Adaptive optics; Stars; Image processing
AbstractTo 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.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); National Science Infrastructure
Peer reviewedYes
NPARC number21270303
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Record identifier2a4b182c-3c01-4e44-89cb-a9ece3c1f21e
Record created2014-01-22
Record modified2016-05-09
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