Planetary and exoplanetary Astronomy Lunch Seminar (PALS) for 2023-02-13

Series: Planetary and exoplanetary Astronomy Lunch Seminar (PALS)
Date: Monday 13-February-2023
Time: 11:15-12:15
Location: ATL 1250
Speaker: Munazza Alam
Title: A Simple Static Disk Condensation Model to Connect Refractory Abundances in Ultra-hot Jupiters with Formation Location

Abstract: The enrichment or depletion of refractory and volatile elements in exoplanetary atmospheres is sensitive to formation location in the protoplanetary disk, planetesimal composition and size, total disk mass, and the surface density of solids in the disk. Whereas the chemistry of volatiles has long been the focus of disk modeling efforts, the abundance patterns of refractory species have been neglected because they condense into solids in exoplanets cooler than 2000 K. For ultra-hot Jupiters (T_eq >2000 K), however, refractories remain in gaseous form - thus also remaining in the observable part of the atmosphere. We present a simple static protoplanetary disk model for refractory elemental condensation sequences at distances between 0.01-0.50 AU, assuming chemical equilibrium at these radii. Refractory elements form interior to the water snowline (<3 AU), so the condensation sequences of these species can provide a detailed probe of atmospheric abundances for planets that formed within a few AU. The theoretical framework described here can be coupled with refractory abundance constraints from high-resolution cross-correlation spectroscopy observations of ultra-hot Jupiter atmospheres to provide a powerful tool for tracing the refractory condensation sequence of the hottest gas giants, constraining where and how these planets formed.

For further information contact PALS coordinators Quanzhi Ye at and Tad Komacek at


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