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Please use this identifier to cite or link to this item: http://hdl.handle.net/2014/38951

Title: Keck Interferometer status and plans
Authors: Colavita, Mark M.
Wizinowich, Peter L.
Akeson, Rachel L.
Keywords: instrumentation
interferometers
adaptive optics
nulling interferometry
differential phase interferometry
Issue Date: 21-Jun-2004
Publisher: Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2004
Citation: Astronomical Telescopes and Instrumentation, Glasgow, Scotland, United Kingdom, June 21-25, 2004
Abstract: Keck Interferometer is a NASA-funded project to combine the two 10 m Keck telescopes for high sensitivity near-infrared fringe visibility measurements, nulling interferometry at 10 µm to measure the quantity of exozodiacal emission around nearby stars, and differential-phase measurements to detect "hot-Jupiters" by their direct emission. Recent activity has included formal visibility mode commissioning, as well as science observations, and we briefly review some of the significant technical aspects and updates to the system. We have also completed laboratory development of the nuller. The nuller uses two modified Mach-Zehnder input nullers, a Michelson cross combiner, and a 10 µm array camera to produce background-limited null measurements. To provide required temporal stability for the nuller, the system incorporates end-to-end laser metrology with phase referencing from two 2.2 µm fringe trackers. The nuller recently completed its pre-ship review and is being installed on the summit. After nuller integration and test, the differential phase mode will be deployed, which uses a 2-5 µm fringe detector in combination with a precision path length modulator and a vacuum delay line for dispersion control.
URI: http://hdl.handle.net/2014/38951
Appears in Collections:JPL TRS 1992+

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