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

Direct-imaging techniques of exoplanets have made significant progressrecently, and will eventually enable to monitor photometric and spectroscopicsignals of earth-like habitable planets in the future. The presence of clouds,however, would remain as one of the most uncertain components in decipheringsuch direct-imaged signals of planets. We attempt to examine how the planetaryobliquity produce different cloud patterns by performing a series of GCM(General Circulation Model) simulation runs using a set of parameters relevantfor our Earth. Then we use the simulated photometric lightcurves to computetheir frequency modulation due to the planetary spin-orbit coupling over anentire orbital period, and attempt to see to what extent one can estimate theobliquity of an Earth-twin. We find that it is possible to estimate theobliquity of an Earth-twin within the uncertainty of several degrees with adedicated 4 m space telescope at 10 pc away from the system if the stellar fluxis completely blocked. While our conclusion is based on several idealizedassumptions, a frequency modulation of a directly-imaged earth-like planetoffers a unique methodology to determine its obliquity.

Obliquity of an Earth-like planet from frequency modulation of its direct imaged lightcurve: mock analysis from general circulation model simulation