3.8-μm photometry during the secondary eclipse of the extrasolar planet HD 209458b |
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| Authors: | Drake Deming † L Jeremy Richardson Joseph Harrington |
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| Institution: | Planetary Systems Laboratory, Code 693, Goddard Space Flight Center, Greenbelt, MD 20771, USA;Exoplanet and Stellar Astrophysics Laboratory, Code 667, Goddard Space Flight Center, Greenbelt, MD 20771, USA;Department of Physics, University of Central Florida, Orlando, FL 32816-2385, USA |
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| Abstract: | We report infrared photometry of the extrasolar planet HD 209458b during the time of secondary eclipse (planet passing behind the star). Observations were acquired during two secondary eclipses at the NASA Infrared Telescope Facility (IRTF) in 2003 September. We used a circular variable filter (1.5 per cent bandpass) centred at 3.8 μm to isolate the predicted flux peak of the planet at this wavelength. Residual telluric absorption and instrument variations were removed by offsetting the telescope to nearby bright comparison stars at a high temporal cadence. Our results give a secondary eclipse depth of 0.0013 ± 0.0011, not yet sufficient precision to detect the eclipse, whose expected depth is ～0.002 –0.003 . We here elucidate the current observational limitations to this technique, and discuss the approach needed to achieve detections of hot Jupiter secondary eclipses at 3.8 μm from the ground. |
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| Keywords: | techniques: photometric eclipses stars: individual: HD 209458 planetary systems infrared: general |
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