The Gemini NICI Planet-Finding Campaign: Combining Coronagraphy with Angular and Spectral Differencing imaging.

Details The Gemini NICI Planet-Finding Campaign: Combining Coronagraphy with Angular and Spectral Differencing imaging. The Gemini NICI Planet-Finding Campaign: Combining Coronagraphy with Angular and Spectral Differencing imaging.

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.2203w&link_type=abstract

American Astronomical Society, ESS meeting #2, #22.03

Physics

Optics

Scientific paper

The Gemini NICI Planet-Finding Campaign is the most ambitious ( 300 targets) direct extrasolar planet imaging campaign to date, achieving median contrasts of 12.5 and 15.0 magnitudes at 0.5 and 1.0'' respectively. Starting in December of 2008, we have been looking for both methane-bearing candidates and non-methane-bearing substellar companions around nearby stars chosen on the basis of youth, proximity, spectral type, etc. NICI (Near Infrared Coronagraphic Imager) is the combination of an 85 element adaptive optics system, a Lyot coronagraph, and a dual channel camera capable of simultaneous spectral difference imaging (SDI) on and off the 1.6um methane feature and angular difference imaging (ADI). We have developed a novel method of reducing the data which takes advantage of both SDI and ADI techniques. Speckles with long correlation times are removed by subtracting a static PSF, possible because of ADI. Short-lived speckles are removed by the subtracting the simultaneously imaged channel, possible because of SDI. Here, I present the data reduction techniques optimized for NICI, and compare among alternate techniques. We verify the contrasts achieved, and the photometric and astrometric accuracy by studying the recovery of simulated companions.

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