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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Spectroscopic phase curves of transiting hot Jupiters are spectralmeasurements at multiple orbital phases, giving a set of disc-averaged spectrathat probe multiple hemispheres. By fitting model phase curves to observations,we can constrain the atmospheric properties of hot Jupiters such as molecularabundance, aerosol distribution and thermal structure, which offer insightsinto their dynamics, chemistry, and formation. In this work, we propose a novel2D temperature scheme consisting of a dayside and a nightside to retrieveinformation from near-infrared phase curves, and apply the scheme to phasecurves of WASP-43b observed by HST/WFC3 and Spitzer/IRAC. In our scheme,temperature is constant on isobars on the nightside and varies withcos$^n$(longitude/$\epsilon$) on isobars on the dayside, where $n$ and$\epsilon$ are free parameters. We fit all orbital phases simultaneously usingthe radiative transfer package NEMESISPY coupled to a Bayesian inference code.We first validate the performance of our retrieval scheme with synthetic phasecurves generated from a GCM, and find our 2D scheme can accurately retrieve thelatitudinally-averaged thermal structure and constrain the abundance of H$_2$Oand CH$_4$. We then apply our 2D scheme to the observed phase curves ofWASP-43b and find: (1) the dayside temperature-pressure profiles do not varystrongly with longitude and are non-inverted; (2) the retrieved nightsidetemperatures are extremely low, suggesting significant nightside cloudcoverage; (3) the H$_2$O volume mixing ratio is constrained to$5.6\times10^{-5}$--$4.0\times10^{-4}$, and we retrieve an upper bound forCH$_4$ at $\sim$10$^{-6}$.

Testing 2D temperature models in Bayesian retrievals of atmospheric properties from hot Jupiter phase curves