Probing the atmosphere of HD189733b with the Na i and K i lines

Keles, E; Kitzmann, D.; Mallonn, M; Alexoudi, X; Fossati, L; Pino, L; Seidel, J V; Carroll, T A; Steffen, M; Ilyin, I; Poppenhäger, K; Strassmeier, K G; von Essen, C; Nascimbeni, V; Turner, J D (2020). Probing the atmosphere of HD189733b with the Na i and K i lines. Monthly notices of the Royal Astronomical Society, 498(1), pp. 1023-1033. Oxford University Press 10.1093/mnras/staa2435

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Center for Space and Habitability (CSH)

UniBE Contributor:

Kitzmann, Daniel

Subjects:

500 Science > 520 Astronomy
500 Science
500 Science > 530 Physics

ISSN:

0035-8711

Publisher:

Oxford University Press

Language:

English

Submitter:

Danielle Zemp

Date Deposited:

13 Apr 2021 12:20

Last Modified:

13 Apr 2021 12:28

Publisher DOI:

10.1093/mnras/staa2435

BORIS DOI:

10.48350/154687

URI:

https://boris.unibe.ch/id/eprint/154687

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