Designing asymmetric and branched petals for planet-finding occulters

Eric Cady, N. Jeremy Kasdin, Stuart Shaklan

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


One of the proposed methods for finding small extrasolar planets is through use of an occulter, a spacecraft which flies in formation with a space-based telescope to block the light from a star, while leaving nearby planets unaffected. This is accomplished by placing the occulter far enough from the telescope to give it a small angular size, and by carefully choosing the shape to strongly suppress the starlight at the telescope aperture. For most designs, this shape takes the form of a number of bilaterally-symmetric structures called petals, arrayed about a circular central disk. In this paper, we show that the necessary number of petals may be reduced by the introduction of an asymmetry in the petal shape, and describe a a general procedure for producing such a shape by optimization for any occulter with petals. In addition, we show that permitting openings within each petal allows a number of additional modifications to be made without affecting the suppression.

Original languageEnglish (US)
Pages (from-to)523-543
Number of pages21
JournalOptics Express
Issue number2
StatePublished - Jan 18 2010

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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