The potassium absorption on HD189733b and HD209458b
Abstract
In this work, we investigate the potassium excess absorption around 7699A of the exoplanets HD189733b and HD209458b. For this purpose, we used high spectral resolution transit observations acquired with the 2 x 8.4m Large Binocular Telescope (LBT) and the Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI). For a bandwidth of 0.8A, we present a detection > 7-sigma with an absorption level of 0.18% for HD189733b. Applying the same analysis to HD209458b, we can set 3-sigma upper limit of 0.09%, even though we do not detect a K- excess absorption. The investigation suggests that the K- feature is less present in the atmosphere of HD209458b than in the one of HD189733b. This comparison confirms previous claims that the atmospheres of these two planets must have fundamentally different properties.
Keywords
Cite
@article{arxiv.1909.04884,
title = {The potassium absorption on HD189733b and HD209458b},
author = {Engin Keles and Matthias Mallonn and Carolina von Essen and Thorsten A. Carroll and Xanthippi Alexoudi and Lorenzo Pino and Ilya Ilyin and Katja Poppenhaeger and Daniel Kitzmann and Valerio Nascimbeni and Jake Turner and Klaus G. Strassmeier},
journal= {arXiv preprint arXiv:1909.04884},
year = {2019}
}
Comments
Accepted in M.N.R.A.S, https://doi.org/10.1093/mnrasl/slz123