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A Non-Detection of Iron in the First High-Resolution Emission Study of the Lava Planet 55 Cnc e

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arxiv 2308.10378 v3 pith:FAFHRJXE submitted 2023-08-20 astro-ph.EP

A Non-Detection of Iron in the First High-Resolution Emission Study of the Lava Planet 55 Cnc e

Kaitlin C. Rasmussen , Miles H. Currie , Celeste Hagee , Christiaan van Buchem , Matej Malik , Arjun B. Savel , Matteo Brogi , Emily Rauscher
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Victoria Meadows Megan Mansfield Eliza M.R. Kempton Jean-Michel Desert Joost P. Wardenier Lorenzo Pino Michael Line Vivien Parmentier Andreas Seifahrt David Kasper Madison Brady Jacob L. Bean
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keywords atmosphereatmosphericcrustalhigh-resolutionlavambarplanetpressure
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abstract

Close-in lava planets represent an extreme example of terrestrial worlds, but their high temperatures may allow us to probe a diversity of crustal compositions. The brightest and most well-studied of these objects is 55 Cancri e, a nearby super-Earth with a remarkably short 17-hour orbit. However, despite numerous studies, debate remains about the existence and composition of its atmosphere. We present upper limits on the atmospheric pressure of 55 Cnc e derived from high-resolution time-series spectra taken with Gemini-N/MAROON-X. Our results are consistent with current crustal evaporation models for this planet which predict a thin $\sim$ 100 mbar atmosphere. We conclude that, if a mineral atmosphere is present on 55 Cnc e, the atmospheric pressure is below 100 mbar.

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