期刊
ASTRONOMICAL JOURNAL
卷 163, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-3881/ac2f4a
关键词
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资金
- NASA [GO-14767, NAS 5-26555]
- CHEOPS ASI-INAF [2019-29-HH.0]
- Swiss National Science Foundation (SNSF)
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (project SPICE DUNE) [947634]
In this study, we present the thermal emission spectrum of WASP-79b obtained through observations with the Hubble Space Telescope. Our results show that a wide range of atmospheric models are consistent with the observed data, indicating the diverse atmospheric properties of WASP-79b. Further observations will be necessary to better constrain the atmospheric characteristics of WASP-79b.
Here we present a thermal emission spectrum of WASP-79b, obtained via Hubble Space Telescope Wide Field Camera 3 G141 observations as part of the PanCET program. As we did not observe the ingress or egress of WASP-79b's secondary eclipse, we consider two scenarios: a fixed mid-eclipse time based on the expected occurrence time, and a mid-eclipse time as a free parameter. In both scenarios, we can measure thermal emission from WASP-79b from 1.1 to 1.7 mu m at 2.4 sigma confidence consistent with a 1900 K brightness temperature for the planet. We combine our observations with Spitzer dayside photometry (3.6 and 4.5 mu m) and compare these observations to a grid of atmospheric forward models that span a range of metallicities, carbon-to-oxygen ratios, and recirculation factors. Given the strength of the planetary emission and the precision of our measurements, we found a wide range of forward models to be consistent with our data. The best-match equilibrium model suggests that WASP-79b's dayside has a solar metallicity and carbon-to-oxygen ratio, alongside a recirculation factor of 0.75. Models including significant H- opacity provide the best match to WASP-79b's emission spectrum near 1.58 mu m. However, models featuring high-temperature cloud species-formed via vigorous vertical mixing and low sedimentation efficiencies-with little day-to-night energy transport also match WASP-79b's emission spectrum. Given the broad range of equilibrium chemistry, disequilibrium chemistry, and cloudy atmospheric models consistent with our observations of WASP-79b's dayside emission, further observations will be necessary to constrain WASP-79b's dayside atmospheric properties.
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