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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693845.0, MPI für Astronomie / Publikationen_mpia
Electric field conjugation with the project 1640 coronagraph
Authors:Cady, E.; Baranec, C.; Beichman, C.; Brenner, D.; Burruss, R.; Crepp, J.; Dekany, R.; Hale, D.; Hillenbrand, L.; Hinkley, S.; Ligon, E. R.; Lockhart, T.; Oppenheimer, B.; Parry, I.; Pueyo, L.; Rice, E.; Roberts, L. C.; Roberts, J.; Shao, M.; Sivaramakrishnan, A.; Soummer, R.; Tang, H.; Truong, T.; Vasisht, G.; Vescelus, F.; Wallace, J. K.; Zhai, C.; Zimmerman, N.
Date of Publication (YYYY-MM-DD):2013
Title of Proceedings:Techniques and Instrumentation for Detection of Exoplanets VI
Start Page:id. 88640K (9 pp)
Volume (in Series):8864
Name of Conference/Meeting:Techniques and Instrumentation for Detection of Exoplanets VI
Place of Conference/Meeting:San Diego, Calif.
Audience:Not Specified
Abstract / Description:The Project 1640 instrument on the 200-inch Hale telescope at Palomar Observatory is a coronagraphic instru- ment with an integral eld spectrograph at the back end, designed to nd young, self-luminous planets around nearby stars. To reach the necessary contrast for this, the PALM-3000 adaptive optics system corrects for fast atmospheric speckles, while CAL, a phase-shifting interferometer in a Mach-Zehnder con guration, measures the quasistatic components of the complex electric eld in the pupil plane following the coronagraphic stop. Two additional sensors measure and control low-order modes. These eld measurements may then be combined with a system model and data taken separately using a white-light source internal to the AO system to correct for both phase and amplitude aberrations. Here, we discuss and demonstrate the procedure to maintain a half-plane dark hole in the image plane while the spectrograph is taking data, including initial on-sky performance.
Comment of the Author/Creator:Date: 2013, September 1, 2013
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
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