Abstract
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 tóthis 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.
| Original language | English (US) |
|---|---|
| Title of host publication | Proceedings of SPIE - The International Society for Optical Engineering |
| Volume | 8445 |
| DOIs | |
| State | Published - 2012 |
| Event | Optical and Infrared Interferometry III - Amsterdam, Netherlands Duration: Jul 1 2012 → Jul 6 2012 |
Other
| Other | Optical and Infrared Interferometry III |
|---|---|
| Country | Netherlands |
| City | Amsterdam |
| Period | 7/1/12 → 7/6/12 |
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Keywords
- Dual field phase referencing
- Laser guide star adaptive optics
- Optical long baseline interferometry
ASJC Scopus subject areas
- Applied Mathematics
- Computer Science Applications
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
First faint Dual-Field Phase-Referenced observations on the Keck Interferometer. / Woillez, J.; Wizinowich, P.; Akeson, R.; Colavita, M.; Eisner, Joshua A; 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.
Proceedings of SPIE - The International Society for Optical Engineering. Vol. 8445 2012. 84450E.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - First faint Dual-Field Phase-Referenced observations on the Keck Interferometer
AU - Woillez, J.
AU - Wizinowich, P.
AU - Akeson, R.
AU - Colavita, M.
AU - Eisner, Joshua A
AU - Millan-Gabet, R.
AU - Monnier, J.
AU - Pott, J. U.
AU - Ragland, S.
AU - Appleby, E.
AU - Cooper, A.
AU - Felizardo, C.
AU - Herstein, J.
AU - Martin, O.
AU - Medeiros, D.
AU - Morrison, D.
AU - Panteleeva, T.
AU - Smith, B.
AU - Summers, K.
AU - Tsubota, K.
AU - Tyau, C.
AU - Wetherell, E.
PY - 2012
Y1 - 2012
N2 - 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 tóthis 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.
AB - 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 tóthis 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.
KW - Dual field phase referencing
KW - Laser guide star adaptive optics
KW - Optical long baseline interferometry
UR - http://www.scopus.com/inward/record.url?scp=84873029363&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84873029363&partnerID=8YFLogxK
U2 - 10.1117/12.926404
DO - 10.1117/12.926404
M3 - Conference contribution
AN - SCOPUS:84873029363
SN - 9780819491466
VL - 8445
BT - Proceedings of SPIE - The International Society for Optical Engineering
ER -