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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 660583.0, MPI für Astronomie / Publikationen_mpia
First faint dual-field phase-referenced observations on the Keck interferometer
Authors:Woillez, J.; Wizinowich, P.; Akeson, R.; Colavita, M.; Eisner, J.; Millan-Gabet, R.; Monnier, J.; Pott, J.-U.; Ragland, S.; Appleby, E.; Cooper, A.; Felizardo, C.; Herstein, J.; Martin, O.; Medeiros, D.; Morrison, D.; Panteleeva, T.; Smith, B.; Summers, K.; Tsubota, K.; Tyau, C.; Wetherell, E.
Date of Publication (YYYY-MM-DD):2012
Title of Proceedings:Optical and Infrared Interferometry III
Start Page:id. 84450E-84450E
End Page:10
Volume (in Series):8445
Name of Conference/Meeting:Optical and Infrared Interferometry III
Audience:Not Specified
Abstract / Description:Ground-based long baseline interferometers have long been limited in sensitivity by the short integration periods imposed by atmospheric turbulence. The first observation fainter than this limit was performed on January 22, 2011 when the Keck Interferometer observed a K=11.5 target, about one magnitude fainter than its K=10.3 limit. This observation was made possible by the Dual Field Phase Referencing instrument of the ASTRA project: simultaneously measuring the real-time effects of the atmosphere on a nearby bright guide star, and correcting for it on the faint target, integration time longer than the turbulence time scale are made possible. As a prelude to this demonstration, we first present the implementation of Dual Field Phase Referencing on the interferometer. We then detail its on-sky performance focusing on the accuracy of the turbulence correction, and on the resulting fringe contrast stability. We conclude with a presentation of early results obtained with Laser Guide Star AO and the interferometer.
Free Keywords:Astrophysics - Instrumentation and Methods for Astrophysics
Comment of the Author/Creator:Date: 2012, July 1, 2012
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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