期刊
ASTROPHYSICAL JOURNAL
卷 781, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/781/2/116
关键词
eclipses; planets and satellites: atmospheres; planets and satellites: individual (WASP-43b); techniques: photometric
资金
- NASA through an award issued by JPL/Caltech
- Science Mission Directorate's Planetary Atmospheres Program [NNX12AI69G]
- Astrophysics Data Analysis Program [NNX13AF38G]
- NASA Headquarters under the NASA Earth and Space Science Fellowship Program [NNX12AL83H]
- Yale Center for Astronomy and Astrophysics through the YCAA postdoctoral Fellowship
- STFC [ST/L00139X/1, PP/D000890/1, ST/J000035/1, ST/G001006/1, ST/G002355/1, ST/J001651/1, ST/J001384/1, PP/D000955/1, PP/F000057/1, ST/I000666/1, PP/F000065/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J000035/1, ST/G002355/1, PP/D000890/1, ST/J001651/1, PP/F000065/1, PP/F000057/1, ST/L00139X/1, ST/I000666/1, ST/J001384/1, ST/G001006/1, PP/D000955/1] Funding Source: researchfish
WASP-43b is one of the closest-orbiting hot Jupiters, with a semimajor axis of a = 0.01526 +/- 0.00018 AU and a period of only 0.81 days. However, it orbits one of the coolest stars with a hot Jupiter (T-* = 4520 +/- 120 K), giving the planet a modest equilibrium temperature of T-eq = 1440 +/- 40 K, assuming zero Bond albedo and uniform planetary energy redistribution. The eclipse depths and brightness temperatures from our jointly fit model are 0.347% +/- 0.013% and 1670 +/- 23 K at 3.6 mu m and 0.382% +/- 0.015% and 1514 +/- 25 K at 4.5 mu m. The eclipse timings improved the estimate of the orbital period, P, by a factor of three (P = 0.81347436 +/- 1.4 x 10(-7) days) and put an upper limit on the eccentricity (e = 0.010(-0.007)(+0.010)). We use our Spitzer eclipse depths along with four previously reported ground-based photometric observations in the near- infrared to constrain the atmospheric properties of WASP- 43b. The data rule out a strong thermal inversion in the dayside atmosphere of WASP- 43b. Model atmospheres with no thermal inversions and fiducial oxygen-rich compositions are able to explain all the available data. However, a wide range of metallicities and C/ O ratios can explain the data. The data suggest low day-night energy redistribution in the planet, consistent with previous studies, with a nominal upper limit of about 35% for the fraction of energy incident on the dayside that is redistributed to the nightside.
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