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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 709691.0, MPI für Astronomie / Publikationen_mpia
First faint dual-field off-axis observations in optical long baseline interferometry
Authors:Woillez, J.; Wizinowich, P.; Akeson, R.; Colavita, M.; Eisner, J.; Millan-Gabet, R.; Monnier, J. D.; Pott, J. -. U.; Ragland, S.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:The Astrophysical Journal
Volume:783
Issue / Number:2
Start Page:id. 104 (13 pp)
Audience:Not Specified
Abstract / Description:Ground-based long baseline interferometers have long been limited in sensitivity in part by the short integration periods imposed by atmospheric turbulence. The first observation fainter than this limit was performed on 2011 January 22 when the Keck Interferometer observed a K = 11.5 target, about 1 mag fainter than its K = 10.3 atmospherically imposed limit; the currently demonstrated limit is K = 12.5. These observations were made possible by the Dual-Field Phase-Referencing (DFPR) instrument, part of the NSF-funded ASTrometry and phase-Referenced Astronomy project; integration times longer than the turbulence time scale are made possible by its ability to simultaneously measure the real-time effects of the atmosphere on a nearby bright guide star and correct for it on the faint target. We present the implementation of DFPR on the Keck Interferometer. Then, we detail its on-sky performance focusing on the accuracy of the turbulence correction and the resulting fringe contrast stability.
Free Keywords:instrumentation: high angular resolution; instrumentation: interferometers
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.1088/0004-637X/783/2/104
URL:http://cdsads.u-strasbg.fr/abs/2014ApJ...783..104W
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