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Astrometry and photometry in high contrast imaging: ADI/LOCI biases and the SOSIE/LOCI solution

From National Research Council Canada

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Affiliation
  1. National Research Council of Canada. NRC Herzberg Institute of Astrophysics
FormatText, Article
Conference2nd International Conference on Adaptive Optics for Extremely Large Telescopes, AO for ELT 2011, September 25-30, 2011, Victoria, BC Canada
Abstract
The direct exoplanet imaging field will strongly benefit from the higher angular resolution achieved by next generation 30+m telescopes. To fully take advantage of these new facilities, one of the biggest challenges that ground-based adaptive optics imaging must overcome is to derive accurate astrometry and photometry of point sources. The planet photometry and its astrometry are used to compare with atmospheric models and to fit orbits. If erroneous numbers are found, or if errors are underestimated, spurious fits can lead to unphysical planet characteristics or wrong/unstable orbits. Overestimating the errors also needs to be avoided as it degrades the value of the data. Several photometry/astrometry biases that are induced by advance imaging and processing techniques (such as ADI/SSDI/LOCI) are presented as well as a procedure to properly overcome those effects. These solutions will be implemented in the Gemini Planet Imager campaign data pipeline and it is expected that they will also play a crucial role in any future direct exoplanet imaging survey.
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PublisherOffice National d'Etudes et de Recherches Aerospatiales, ONERA
In
  • Conference Proceeding.
LanguageEnglish
Peer reviewedYes
NPARC number23004524
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Record identifier5cc1e1f2-ab27-4fe5-a876-c1f69b241047
Record created2018-11-14
Record modified2020-06-03
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