WASP-43 Archives

TOP: An eclipse map fitted to the data in Figure 9, using a model M (ℓmax = 2). Table 2 and Figure 12 show how this model is strongly preferred over the Fourier series model (the null hypothesis) by the cross-validation metric. Hammond et al. (2024) discussed how the structure of this ℓmax = 2 map is limited by its limited spatial freedom. BOTTOM: An eclipse map fitted to the data in Figure 9 using a model M (𝛼 = 4641.6, ℓmax = 4). This value of 𝛼 gives the optimal cross-validation score in Figure 12. We suggest that this value imposes an information content which reflects a combination of the spatial scale of the true map and the level of mapping precision achievable given the precision of the data itself. -- astro-ph.EP

Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Identifying and Fitting Eclipse Maps of Exoplanets with Cross-Validation

by Keith CowingJune 6, 2024June 6, 2024

Eclipse mapping uses the shape of the eclipse of an exoplanet to measure its two-dimensional structure. Light curves are mostly composed of longitudinal information, with the latitudinal information only contained […]

Comparison of dayside thermochemical equilibrium abundances with the chemical abundances retrieved from the MIRI data. The shaded regions represent a range of 1D thermochemical equilibrium models consistent with our estimated metallicity in 3.2. The horizontal error bars show the 1𝜎 credible intervals of our retrieved molecular abundances using the MIRI data. The right edge of the red horizontal arrow shows the 95% upper limit of CH4 abundance retrieved using the MIRI data. Note that the vertical coordinates of the error bars and the arrow are arbitrary. -- astro-ph.EP

Astrochemistry, Atmospheres, Climate, Weather, Exploration Gear & Tech, Status Report

Simultaneous Retrieval of Orbital Phase Resolved JWST/MIRI Emission Spectra of the Hot Jupiter WASP-43b: Evidence of Water, Ammonia and Carbon Monoxide

by Keith CowingJune 6, 2024June 6, 2024

Spectroscopic phase curves of hot Jupiters measure their emission spectra at multiple orbital phases, thus enabling detailed characterisation of their atmospheres. Precise constraints on the atmospheric composition of these exoplanets […]