Other
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.0104h&link_type=abstract
American Astronomical Society, DPS meeting #38, #01.04; Bulletin of the American Astronomical Society, Vol. 38, p.481
Other
Scientific paper
We observed the secondary eclipse of the transiting extrasolar planet HD 149026b in the 8-micron channel of the Spitzer Space Telescope. The 6-hour observation produced over 48,000 frames (0.4 sec/frame in the 32 x 32-pixel subarray mode). Eclipse measurements yield the intrinsic infrared flux of the planet at the observation wavelength as well as a constraint on orbital eccentricity due to eclipse timing. Combined with an accurate radius, the former yields temperature information for the 8-micron photosphere, which constrains atmospheric models. We derive an iterative integral solution to find the brightness temperature using a model stellar spectrum and the published filter function. This method does not depend on the uncertain system distance and hence is more accurate than some other methods. We modeled and removed several systematic errors. These include independent offsets for each photometric position (medium-scale, nine-point Reuleaux pattern), removal of a curved photometric baseline, an adjustment depending on the frame number since the last telescope motion, and an anomalous background in the 58th frame of each 64-frame set. We will present quantitative results and interpretation at the meeting. JPL/Caltech operates Spitzer under a NASA contract. NASA and NSF supported this work.
Deming Drake
Harrington Joseph
Luszcz S. H.
Richardson Lee Jeremy
Seager Sara
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