Strong infrared emission from the extrasolar planet HD 189733b
作者： Drake Deming , Joseph Harrington , Sara Seager , L. Jeremy Richardson
DOI: 10.1086/503358
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摘要: We report detection of strong infrared thermal emission from the nearby (d = 19 pc) transiting extrasolar planet HD 189733b by measuring flux decrement during its prominent secondary eclipse. A 6 hr photometric sequence using Spitzer's spectrograph in peak-up imaging mode at 16 μm shows eclipse depth to be 0.551% ± 0.030%, with accuracy limited instrumental baseline uncertainties, but 32 σ precision (σ 0.017%) on detection. The brightness temperature this (1117 42 K) is very similar Spitzer detections TrES-1 and 209458b, observed planetary (660 μJy) an order magnitude greater. This large signal will allow a detailed characterization infrared. Our photometry has sufficient signal-to-noise ratio (~400 per point) motivate search for structure ingress/egress portions curve, caused putative disk planet. show that binning our s sampling down ~6 minute resolution, we detect modulation intensity derivative due overall shape planet, sensitivity not yet distinguish between realistic models distribution across planet's disk. point out potential extending regime hot Neptunes, if such systems are discovered among lower main-sequence stars.
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