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Abstract: We report infrared photometry of the extrasolar planet HD 209458b during thetime of secondary eclipse planet passing behind the star. Observations wereacquired during two secondary eclipses at the NASA Infrared Telescope FacilityIRTF in September 2003. We used a circular variable filter 1.5-percentbandpass centered at 3.8 microns to isolate the predicted flux peak of theplanet at this wavelength. Residual telluric absorption and instrumentvariations were removed by offsetting the telescope to nearby bright comparisonstars at a high temporal cadence. Our results give a secondary eclipse depth of0.0013 +- 0.0011, not yet sufficient precision to detect the eclipse, whoseexpected depth is approximately 0.002 - 0.003. We here elucidate the currentobservational limitations to this technique, and discuss the approach needed toachieve detections of hot Jupiter secondary eclipses at 3.8 microns from theground.



Author: Drake Deming, L. Jeremy Richardson, Joseph Harrington

Source: https://arxiv.org/







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