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.
Original language | English (US) |
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Article number | 155 |
Journal | Astronomical Journal |
Volume | 166 |
Issue number | 4 |
DOIs | |
State | Published - Oct 1 2023 |
Externally published | Yes |
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science