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Experimental Astronomy

, Volume 44, Issue 2, pp 209–237 | Cite as

High contrast observations of bright stars with a starshade

  • Anthony HarnessEmail author
  • Webster Cash
  • Steve Warwick
Original Article

Abstract

Starshades are a leading technology to enable the direct detection and spectroscopic characterization of Earth-like exoplanets. In an effort to advance starshade technology through system level demonstrations, the McMath-Pierce Solar Telescope was adapted to enable the suppression of astronomical sources with a starshade. The long baselines achievable with the heliostat provide measurements of starshade performance at a flight-like Fresnel number and resolution, aspects critical to the validation of optical models. The heliostat has provided the opportunity to perform the first astronomical observations with a starshade and has made science accessible in a unique parameter space, high contrast at moderate inner working angles. On-sky images are valuable for developing the experience and tools needed to extract science results from future starshade observations. We report on high contrast observations of nearby stars provided by a starshade. We achieve 5.6 × 10− 7 contrast at 30 arcseconds inner working angle on the star Vega and provide new photometric constraints on background stars near Vega.

Keywords

Starshades High contrast Direct imaging 

Notes

Acknowledgements

This work was supported by a Strategic University Research Partnership between CU and JPL with Co-I Randy Pollock. AH was supported at CU by a NASA Space Technology Research Fellowship (NNX13AM71H). The authors would like to thank Richard Capps (JPL) for suggesting the use of McMath. The authors would like to thank Detrick Branston for excellent observing support at McMath and Ann Shipley, Ben Zeiger, Danny Smith, and Michael Richards for assistance during observing runs. AH would also like to thank Wayne Green. The authors thank the anonymous referee for the very useful suggestions and comments. The McMath-Pierce Solar Telescope facility is operated by the National Solar Observatory. The National Solar Observatory is operated by the Association of Universities for Research in Astronomy under a cooperative agreement with the National Science Foundation.

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2017

Authors and Affiliations

  1. 1.Department of Astrophysical & Planetary SciencesUniversity of Colorado BoulderBoulderUSA
  2. 2.Northrop Grumman Aerospace SystemsRedondo BeachUSA
  3. 3.Department of Mechanical & Aerospace EngineeringPrinceton UniversityPrincetonUSA

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