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

The atmospheric dynamics of tidally-locked hot Jupiters is dominated by theequatorial winds. Understanding the interaction between global circulation andchemistry is crucial in atmospheric studies and interpreting observations.Two-dimensional (2D) photochemical transport models shed light on how theatmospheric composition depends on circulation. In this paper, we introduce the2D photochemical transport model, VULCAN 2D, which improves on the pseudo-2Dapproaches by allowing for non-uniform zonal winds. We extensively validate ourVULCAN 2D with analytical solutions and benchmark comparisons. Applications toHD 189733 b and HD 209458 b reveal distinct characteristics in horizontaltransport-dominated and vertical mixing-dominated regimes. Motivated by theinferred carbon-rich atmosphere by Giacobbe et al. (2021), we find that HD209458 b with super-solar carbon-to-oxygen ratio (C/O) exhibits pronounced C2H4absorption on the morning limb but not on the evening limb, owing to horizontaltransport from the nightside. We discuss when a pseudo-2D approach is a validassumption and its inherent limitations. Finally, we demonstrate the effect ofhorizontal transport in transmission observations and its impact on themorning-evening limb asymmetry with synthetic spectra, highlighting the need toconsider global transport when interpreting exoplanet atmospheres.

Global Chemical Transport on Hot Jupiters: Insights from 2D VULCAN photochemical model