A Caltech Library Service

First Faint Dual-field Off-axis Observations in Optical Long Baseline Interferometry

Woillez, J. and Wizinowich, P. and Akeson, R. and Colavita, M. and Eisner, J. and Millan-Gabet, R. and Monnier, J. D. and Pott, J.-U. and Ragland, S. (2014) First Faint Dual-field Off-axis Observations in Optical Long Baseline Interferometry. Astrophysical Journal, 783 (2). Art. No. 104. ISSN 0004-637X. doi:10.1088/0004-637X/783/2/104.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Akeson, R.0000-0001-9674-1564
Millan-Gabet, R.0000-0003-0447-5866
Monnier, J. D.0000-0002-3380-3307
Pott, J.-U.0000-0003-4291-2078
Additional Information:© 2014 American Astronomical Society. Received 2013 July 19; accepted 2014 January 24; published 2014 February 20. The ASTRA project was supported by the National Science Foundation Major Research Instrumentation grant AST-0619965. The Keck Interferometer was funded by the National Aeronautics and Space Administration as part of its Exoplanet Exploration program. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:instrumentation: high angular resolution; instrumentation: interferometers
Issue or Number:2
Record Number:CaltechAUTHORS:20140617-131022855
Persistent URL:
Official Citation:First Faint Dual-field Off-axis Observations in Optical Long Baseline Interferometry J. Woillez et al. 2014 ApJ 783 104
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46308
Deposited By: Ruth Sustaita
Deposited On:17 Jun 2014 20:49
Last Modified:10 Nov 2021 17:23

Repository Staff Only: item control page