Dynamic distortion calibration using a diffracting pupil: High precision astrometry laboratory demonstration for exoplanet detection

Eduardo A. Bendek, S. Mark Ammons, Harish Shankar, Olivier Guyon

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

4 Scopus citations

Abstract

Detection of earth-size exoplanets using the astrometric signal of the host star requires sub microarcsecond measurement precision. One major challenge in achieving this precision using a medium-size (<2-m) space telescope is the calibration of dynamic distortions. The researchers propose a diffractive pupil technique that uses an array of approximately 50um dots on the primary mirror that generate polychromatic diffraction spikes in the focal plane. The diffraction spikes encode optical distortions in the optical system and may be used to calibrate astrometric measurements. This concept can be used simultaneously with coronagraphy for exhaustive characterization of exoplanets (mass, spectra, orbit). At the University of Arizona, a high precision astrometry laboratory is being developed to demonstrate the capabilities of this diffractive pupil concept. The researchers aim to achieve 10 μas single-axis precision in the laboratory, simulating 0.14 μas precision on a 1.4 m space telescope. This paper describes this laboratory and presents the data and results obtained so far.

Original languageEnglish (US)
Title of host publicationTechniques and Instrumentation for Detection of Exoplanets V
DOIs
StatePublished - Oct 11 2011
EventTechniques and Instrumentation for Detection of Exoplanets V - San Diego, CA, United States
Duration: Aug 23 2011Aug 24 2011

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8151
ISSN (Print)0277-786X

Other

OtherTechniques and Instrumentation for Detection of Exoplanets V
CountryUnited States
CitySan Diego, CA
Period8/23/118/24/11

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Keywords

  • Diffractive pupil
  • Distortion
  • exoplanet detection
  • high precision astrometry

ASJC Scopus subject areas

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

Cite this

Bendek, E. A., Ammons, S. M., Shankar, H., & Guyon, O. (2011). Dynamic distortion calibration using a diffracting pupil: High precision astrometry laboratory demonstration for exoplanet detection. In Techniques and Instrumentation for Detection of Exoplanets V [81510U] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 8151). https://doi.org/10.1117/12.893130