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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 hr 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 ∼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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de_Wit, Julien; Doyon, René; Rackham, Benjamin V; Lim, Olivia; Ducrot, Elsa; Kreidberg, Laura; Benneke, Björn; Ribas, Ignasi; Berardo, David; Niraula, Prajwal; et al (, Nature Astronomy)
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Kane, Stephen R.; Arney, Giada N.; Byrne, Paul K.; Dalba, Paul A.; Desch, Steven J.; Horner, Jonti; Izenberg, Noam R.; Mandt, Kathleen E.; Meadows, Victoria S.; Quick, Lynnae C. (, Journal of Geophysical Research: Planets)null (Ed.)
