Probing the atmosphere of HD189733b with the Na I and K I lines
Date Issued
2020
Author(s)
Keles, E.
•
Kitzmann, D.
•
Mallonn, M.
•
Alexoudi, X.
•
Fossati, L.
•
•
Seidel, J. V.
•
Carroll, T. A.
•
Steffen, M.
•
Ilyin, I.
•
Poppenhäger, K.
•
Strassmeier, K. G.
•
von Essen, C.
•
•
Turner, J. D.
Abstract
High spectral resolution transmission spectroscopy is a powerful tool to characterize exoplanet atmospheres. Especially for hot Jupiters, this technique is highly relevant, due to their high-altitude absorption, e.g. from resonant sodium (Na I) and potassium (K I) lines. We resolve the atmospheric K I absorption on HD189733b with the aim to compare the resolved K I line and previously obtained high-resolution Na I-D line observations with synthetic transmission spectra. The line profiles suggest atmospheric processes leading to a line broadening of the order of ˜10 km/s for the Na I-D lines and only a few km/s for the K I line. The investigation hints that either the atmosphere of HD189733b lacks a significant amount of K I or the alkali lines probe different atmospheric regions with different temperature, which could explain the differences we see in the resolved absorption lines.
Volume
498
Issue
1
Start page
1023
Issn Identifier
0035-8711
Ads BibCode
2020MNRAS.498.1023K
Rights
open.access
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