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; S. Mark Ammons; Eduardo Bendek; Robert Woodruff; Bijan Nemati; Joe Pitman

doi:10.1117/12.857902

6 August 2010 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, S. Mark Ammons, Eduardo Bendek, Robert Woodruff, Bijan Nemati, Joe Pitman

Author Affiliations +

Proceedings Volume 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave; 77312C (2010) https://doi.org/10.1117/12.857902
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

High precision astrometry of nearby bright stars is theoretically (in the photon noise limit) possible with a space coronagraph 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 coronagraph 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 mirror 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.

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Olivier Guyon, Michael Shao, Stuart Shaklan, Marie Levine, S. Mark Ammons, Eduardo Bendek, Robert Woodruff, Bijan Nemati, and Joe Pitman "Single aperture imaging astrometry with a diffracting pupil: application to exoplanet mass measurement with a small coronagraphic space telescope", Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 77312C (6 August 2010); https://doi.org/10.1117/12.857902

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KEYWORDS

Space telescopes

Coronagraphy

Telescopes

Diffraction

Exoplanets

Stars

Cameras

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