English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Here we present a thermal emission spectrum of WASP-79b, obtained via HubbleSpace Telescope Wide Field Camera 3 G141 observations as part of the PanCETprogram. As we did not observe the ingress or egress of WASP-79b's secondaryeclipse, we consider two scenarios: a fixed mid-eclipse time based on theexpected occurrence time, and a mid-eclipse time as a free parameter. In bothscenarios, we can measure thermal emission from WASP-79b from 1.1 to 1.7 $\mu$mat 2.4$\sigma$ confidence consistent with a 1900 K brightness temperature forthe planet. We combine our observations with Spitzer dayside photometry (3.6and 4.5 $\mu$m) and compare these observations to a grid of atmospheric forwardmodels that span a range of metallicities, carbon-to-oxygen ratios, andrecirculation factors. Given the strength of the planetary emission and theprecision of our measurements, we found a wide range of forward models to beconsistent with our data. The best-match equilibrium model suggests thatWASP-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 viavigorous vertical mixing and low sedimentation efficiencies-with littleday-to-night energy transport also match WASP-79b's emission spectrum. Giventhe broad range of equilibrium chemistry, disequilibrium chemistry, and cloudyatmospheric models consistent with our observations of WASP-79b's daysideemission, further observations will be necessary to constrain WASP-79b'sdayside atmospheric properties.

The Emission Spectrum of the Hot Jupiter WASP-79b from HST/WFC3