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Proceedings Paper

Self-nulling spectrograph for star glare rejection
Author(s): Thomas D. Ditto
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Paper Abstract

We introduce a notional nulling interferometer for extinction of glare from single star exoplanetary systems. The principle of double dispersion telescopy correlates an incident angular position with a unique wavelength. In such telescopes, a secondary spectrograph is used to disambiguate overlapping wavelengths from the primary disperser. A single rejection band can be created in the secondary spectrograph based on the resulting wavelength modulation. Two optical paths are directed from the slit situated between the primary and secondary dispersers. Angles of incidence and path lengths are slightly offset between the pair of post-slit wave trains. By this configuration, a half wave path difference is established at the position and diameter of the host star, causing phase cancellation at a unique spectral band. Having a single rejection band avoids repetitive banding endemic to conventional interferometric telescopy. There is a tradeoff with chromatic aberration in the images of the exoplanets.

Paper Details

Date Published: 9 September 2019
PDF: 9 pages
Proc. SPIE 11117, Techniques and Instrumentation for Detection of Exoplanets IX, 111171P (9 September 2019); doi: 10.1117/12.2525524
Show Author Affiliations
Thomas D. Ditto, 3DeWitt, LLC (United States)


Published in SPIE Proceedings Vol. 11117:
Techniques and Instrumentation for Detection of Exoplanets IX
Stuart B. Shaklan, Editor(s)

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