Special Section on WFIRST-AFTA Coronagraphs

Impact of WFIRST-AFTA line-of-sight jitter distributions on phase-induced amplitude apodization complex mask coronagraph science yield

[+] Author Affiliations
Brian Kern

Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91016, United States

J. Astron. Telesc. Instrum. Syst. 2(1), 011016 (Jan 27, 2016). doi:10.1117/1.JATIS.2.1.011016
History: Received June 1, 2015; Accepted December 21, 2015
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Abstract.  A framework for evaluating the science yield of a coronagraph in the presence of a variety of line-of-sight jitter environments is described and the use of a tip-tilt threshold for improving science yield is proposed. The current expectations of the WFIRST-AFTA mission are used for specific distributions of line-of-sight jitter, including the current expectations for tip-tilt correction using a low-order wavefront sensor/control. The effect of the residual tip-tilt on the phase-induced amplitude apodization complex mask coronagraph (PIAACMC) architecture is considered, because the performance of the PIAACMC architecture is expected to be dominated by tip-tilt sensitivity, implying that this treatment has a large impact on the final science yield. The most important outcomes of this study are that the rms residual tip-tilt expected after correction is 0.6  masrms/axis and that by eliminating some science frames during analysis through a tip-tilt threshold, the number of planets observable increases by 25% for the 550-nm imaging channel. The number of known radial velocity planets expected to be observed ranges from 29 to 78 at 550 nm and from 9 to 12 at 890 nm.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Brian Kern
"Impact of WFIRST-AFTA line-of-sight jitter distributions on phase-induced amplitude apodization complex mask coronagraph science yield", J. Astron. Telesc. Instrum. Syst. 2(1), 011016 (Jan 27, 2016). ; http://dx.doi.org/10.1117/1.JATIS.2.1.011016


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