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

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  • E. Keles, Leibniz Institute for Astrophysics Potsdam
  • ,
  • D. Kitzmann, University of Bern
  • ,
  • M. Mallonn, Leibniz Institute for Astrophysics Potsdam
  • ,
  • X. Alexoudi, Leibniz Institute for Astrophysics Potsdam
  • ,
  • L. Fossati, Austrian Academy of Sciences
  • ,
  • L. Pino, University of Amsterdam, Osservatorio Astrofisico Di Arcetri, Florence
  • ,
  • J. V. Seidel, University of Geneva
  • ,
  • T. A. Carroll, Leibniz Institute for Astrophysics Potsdam
  • ,
  • M. Steffen, Leibniz Institute for Astrophysics Potsdam
  • ,
  • I. Ilyin, Leibniz Institute for Astrophysics Potsdam
  • ,
  • K. Poppenhäger, Leibniz Institute for Astrophysics Potsdam
  • ,
  • K. G. Strassmeier, Leibniz Institute for Astrophysics Potsdam
  • ,
  • C. von Essen
  • V. Nascimbeni, Astronomical Observatory of Padua, University of Padova
  • ,
  • J. D. Turner, Cornell University, University of Virginia

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.

OriginalsprogEngelsk
TidsskriftMonthly Notices of the Royal Astronomical Society
Vol/bind498
Nummer1
Sider (fra-til)1023-1033
Antal sider11
ISSN0035-8711
DOI
StatusUdgivet - okt. 2020

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