Shaped pupil coronagraph design for Subaru high-contrast imaging with reduction of the inner working angle for earth-like planet detection

Joane F. Joseph, Thayne Currie, Jessica A. Gersh-Range, Robert J. Vanderbei, N. Jeremy Kasdin, Christian Delacroix

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The Subaru telescope detects exoplanets at contrasts of 1 × 10-5 by using a shaped pupil coronagraph. The shaped pupil is a binary mask designed to alter the propagation of light to the image plane in a way that produces dark holes (also called "discovery regions") where off-Axis point sources can be detected more easily. Our objective is to decrease the inner working angle (IWA) of the discovery regions to allow for detection of Earth-like planets found closer to the target star. The current Subaru shaped pupil has an IWA of 3.5 λ/D and an outer working angle (OWA) of 16 λ/D. These characteristics of the IWA limit the detection of planets close to the star and the low transmission level of the shaped pupil potentially intercepts the transmission of o-Axis point sources. Here we present a new pupil design that attains a smaller IWA and achieves a transmission of greater than 50%, while maintaining the current contrast level. The tradeoff is a smaller OWA, which allows for less discovery space at the outer regions of the image plane. We also explore the potential benefits of setting the desired level of transmission and maximizing the contrast, as opposed to the current method of fixing the contrast and maximizing the transmission.

Original languageEnglish (US)
Title of host publicationTechniques and Instrumentation for Detection of Exoplanets IX
EditorsStuart B. Shaklan
PublisherSPIE
ISBN (Electronic)9781510629271
DOIs
StatePublished - Jan 1 2019
EventTechniques and Instrumentation for Detection of Exoplanets IX 2019 - San Diego, United States
Duration: Aug 12 2019Aug 15 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11117
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceTechniques and Instrumentation for Detection of Exoplanets IX 2019
CountryUnited States
CitySan Diego
Period8/12/198/15/19

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Keywords

  • Exoplanet detection
  • High-contrast imaging
  • SCExAO
  • Shaped pupil
  • Subaru

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  • Cite this

    Joseph, J. F., Currie, T., Gersh-Range, J. A., Vanderbei, R. J., Kasdin, N. J., & Delacroix, C. (2019). Shaped pupil coronagraph design for Subaru high-contrast imaging with reduction of the inner working angle for earth-like planet detection. In S. B. Shaklan (Ed.), Techniques and Instrumentation for Detection of Exoplanets IX [111171I] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11117). SPIE. https://doi.org/10.1117/12.2529719