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Proceedings Paper

A starshade petal error budget for exo-earth detection and characterization
Author(s): Stuart B. Shaklan; Luis Marchen; P. Douglas Lisman; Eric Cady; Stefan Martin; Mark Thomson; Philip Dumont; N. Jeremy Kasdin
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Paper Abstract

We present a starshade error budget with engineering requirements that are well within the current manufacturing and metrology capabilities. The error budget is based on an observational scenario in which the starshade spins about its axis on timescales short relative to the zodi-limited integration time, typically several hours. The scatter from localized petal errors is smoothed into annuli around the center of the image plane, resulting in a large reduction in the background flux variation while reducing thermal gradients caused by structural shadowing. Having identified the performance sensitivity to petal shape errors with spatial periods of 3-4 cycles/petal as the most challenging aspect of the design, we have adopted and modeled a manufacturing approach that mitigates these perturbations with 1-m long precision edge segments positioned using commercial metrology that readily meets assembly requirements. We have performed detailed thermal modeling and show that the expected thermal deformations are well within the requirements as well. We compare the requirements for four cases: a 32 m diameter starshade with a 1.5 m telescope, analyzed at 75 and 90 mas, and a 40 m diameter starshade with a 4 m telescope, analyzed at 60 and 75 mas.

Paper Details

Date Published: 15 September 2011
PDF: 13 pages
Proc. SPIE 8151, Techniques and Instrumentation for Detection of Exoplanets V, 815113 (15 September 2011);
Show Author Affiliations
Stuart B. Shaklan, Jet Propulsion Lab. (United States)
Luis Marchen, Jet Propulsion Lab. (United States)
P. Douglas Lisman, Jet Propulsion Lab. (United States)
Eric Cady, Jet Propulsion Lab. (United States)
Stefan Martin, Jet Propulsion Lab. (United States)
Mark Thomson, Jet Propulsion Lab. (United States)
Philip Dumont, KinetX Inc. (United States)
N. Jeremy Kasdin, Princeton Univ. (United States)

Published in SPIE Proceedings Vol. 8151:
Techniques and Instrumentation for Detection of Exoplanets V
Stuart Shaklan, Editor(s)

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