Water abundances and cloud properties in ten hot giant exoplanets and implications for their formation conditions

Friday 6 July, 10:00

Transmission spectroscopy of exoplanets has the potential to provide precise measurements of atmospheric water vapour abundances, in particular of hot Jupiters whose large sizes and high temperatures make them especially conducive to such observations. The H2O abundances thus derived can provide important constraints on the formation and migration pathways of such exoplanets. We will present new results from a comprehensive and homogeneous analysis of state-of-the-art broadband spectra for a sizable sample of exoplanets. In particular, we will report detailed estimates of H2O abundances in ten hot giant exoplanets, along with their correlations with other atmospheric and bulk properties of the planets such as cloud and haze properties, temperatures, and other chemical species. The H2O abundance estimates presented here can serve as constraints on the formation and migration pathways of hot giant exoplanets and we will discuss the differences in formation conditions between solar and hot extrasolar giant planets. Our study demonstrates the promise of high-precision and broadband transmission spectra to constrain atmospheric properties of exoplanets with HST and upcoming facilities such as JWST.

Submitted by