Special Section on WFIRST-AFTA Coronagraphs

Exoplanet detection and characterization via parallel broadband nulling coronagraphy

[+] Author Affiliations
Brian A. Hicks

Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, Maryland 20771, United States

J. Astron. Telesc. Instrum. Syst. 2(1), 011015 (Jan 25, 2016). doi:10.1117/1.JATIS.2.1.011015
History: Received June 1, 2015; Accepted December 21, 2015
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Abstract.  The contrast and angular resolution required to directly image and characterize mature exoplanetary systems place stringent requirements on the space-based telescopes and starlight suppression systems needed to study spatial distributions of debris disks, exozodiacal dust, and individual planets at multiple epochs in their orbits. A nulling interferometer (nuller) is a coronagraphic suppression system that can be used with all telescope types, including those with obscured and segmented apertures envisioned for upcoming and future observatories. One of the challenges for detection and characterization of exoplanetary signals is achieving high contrast with broad spectral coverage. This work presents design concepts for broadband nulling over four parallel 20% bandpasses spanning the visible spectrum. Contrast-limiting effects of stellar angular extent, residual chromaticity of broadband phase shifters, and aperture diffraction are considered to reach simultaneous 2×108 contrast over separations spanning 0.2 to 0.9 arc sec for a 2.4-m telescope observing a Sun-like star at 10 pc. With added dark hole wavefront control and postprocessing point spread function subtraction techniques to further reduce scattered starlight, such a system could be capable of detecting the very the nearest Earth-like exoplanets and spectral characterization of several nearby extrasolar gas giants.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Brian A. Hicks
"Exoplanet detection and characterization via parallel broadband nulling coronagraphy", J. Astron. Telesc. Instrum. Syst. 2(1), 011015 (Jan 25, 2016). ; http://dx.doi.org/10.1117/1.JATIS.2.1.011015


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