TL;DR
This paper introduces a novel method called transmission strings for spatially mapping exoplanet atmospheres during transit, allowing for inhomogeneous atmospheric analysis by modeling the planet's shape as a Fourier series.
Contribution
The work presents a flexible mathematical framework for mapping exoplanet atmospheres that relaxes traditional assumptions of circular shapes, enabling detailed multidimensional atmospheric studies.
Findings
Allows for shape variability in transit modeling
Enables analysis of atmospheric inhomogeneities
Provides an open-source tool for the community
Abstract
Exoplanet transmission spectra, which measure the absorption of light passing through a planet's atmosphere during transit, are most often assessed globally, resulting in a single spectrum per planetary atmosphere. However, the inherent three-dimensional nature of planetary atmospheres, via thermal, chemical, and dynamical processes, can imprint inhomogeneous structure and properties in the observables. In this work, we devise a technique for spatially mapping the atmospheres of exoplanets in transmission. Our approach relaxes the assumption that transit light curves are created from circular stars occulted by circular planets, and instead we allow for flexibility in the planet's sky-projected shape. We define the planet's radius to be a single-valued function of angle around its limb, and we refer to this mathematical object as a transmission string. These transmission strings are…
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