Single aperture imaging astrometry with a diffracting pupil: Application to exoplanet mass measurement with a small coronagraphic space telescope

Olivier Guyon, Michael Shao, Stuart Shaklan, Marie Levine, Mark Amnions, Eduardo Bendek, Robert Woodruff, Bijan Nemati, Joe Pitman

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

4 Scopus citations

Abstract

High precision astrometry of nearby bright stars is theoretically (in the photon noise limit) possible with a space corona graph using a wide field diffraction limited camera imaging an annulus of background stars around the central coronagraphic field. With the sub-micro arcsecond accuracy theoretically achievable on a 1.4-m telescope, the mass of all planets that can be imaged by the corona graph would be estimated. Simultaneous imaging and astrometric measurements would reduce the number of astrometric measurements necessary for mass determination, and reduce confusion between multiple planets and possible exozodiacal clouds in the coronagraphic image. While scientifically attractive, this measurement is technically very challenging, and must overcome astrometric distortions, which, in conventional telescopes, are several orders of magnitude above the photon noise limit. In this paper, we propose a new approach to calibrating astrometric distortions in the wide field imaging camera. The astrometric measurement is performed by simultaneously imaging background stars and diffraction spikes from the much brighter coronagraphic target on the same focal plane array. The diffraction spikes are generated by a series of small dark spots on the primary minor to reduce sensitivity to optical and mechanical distortions. Small scale distortions and detector errors are averaged down to sub-micro arcsecond by rolling the telescope around the line of sight. A preliminary error budget is shown and discussed to identify major sources of error for a 1.4-m telescope imaging a 0.25 squaredeg field of view at the galactic pole.

Original languageEnglish (US)
Title of host publicationSpace Telescopes and Instrumentation 2010
Subtitle of host publicationOptical, Infrared, and Millimeter Wave
DOIs
StatePublished - Oct 27 2010
EventSpace Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave - San Diego, CA, United States
Duration: Jun 27 2010Jul 2 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7731
ISSN (Print)0277-786X

Other

OtherSpace Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave
CountryUnited States
CitySan Diego, CA
Period6/27/107/2/10

Keywords

  • Astrometry
  • Coronagraphy
  • Exoplanets

ASJC Scopus subject areas

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

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    Guyon, O., Shao, M., Shaklan, S., Levine, M., Amnions, M., Bendek, E., Woodruff, R., Nemati, B., & Pitman, J. (2010). Single aperture imaging astrometry with a diffracting pupil: Application to exoplanet mass measurement with a small coronagraphic space telescope. In Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave [77312C] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7731). https://doi.org/10.1117/12.857902